YES. An electric fan.

I agree with Emery and jim k,
http://bdub.net/gmcmotorhome.info/engine.html

Flar ass waste of time and money

But is your foot aim for it,....

> Yes, my thought is that it is a waste of time and money. It would take
> too much current for a large enough fan to do any good.
> If you are often having problems with hot day or stuck in traffic you
> should consider using a 70% mix of antifreeze coolant instead of 50%. That
> will give you a higher boil protection.
> You should also turn off your air conditioner if in that condition.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>

> >
> > Any thoughts on electric fan(s) (pusher?) As backup for extra hot
> days/stuck in traffic?
> >
> > Pete
> > --
> > Cary, NC
> >
> > No Coach yet but likely center kitchen, dry side bath Royale, 78, 403,
> hopefully with good original white Imron paint.
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://bdub.net/gmcmotorhome.info/
Alternator Protection Cable
http://bdub.net/gmcmotorhome.info/APC.html
 
I'm dissapointed to hear that Frady appears to have goone over to the 'soak them' side. He was an asset to the community in the Southeast. However,
he ebayed his GMC specific parts a while back. Maybe he doesn't wanna mess with them any more. Shame.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
I've always had a pusher fan mounted in the front and blowing back towards
the engine I have it on a separate switch that I can flick on and off if I
see the temperature starting to rise...or even thinking about going up. It
is particularly useful on the 40 heading east out of Albuquerque. That is
one long, dirty, haul when towing ........

Mike in NS

On Tue, Apr 11, 2017 at 7:46 PM, Johnny Bridges via Gmclist <

> I'm dissapointed to hear that Frady appears to have goone over to the
> 'soak them' side. He was an asset to the community in the Southeast.
> However,
> he ebayed his GMC specific parts a while back. Maybe he doesn't wanna
> mess with them any more. Shame.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

Life is too short to hold a grudge; slash some tires and call it even !
 
The pusher fan can assist you a little, but the fact that it blocks air
flow when not in use, negates the benefit.

> Yes, my thought is that it is a waste of time and money. It would take
> too much current for a large enough fan to do any good.
> If you are often having problems with hot day or stuck in traffic you
> should consider using a 70% mix of antifreeze coolant instead of 50%. That
> will give you a higher boil protection.
> You should also turn off your air conditioner if in that condition.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>

> >
> > Any thoughts on electric fan(s) (pusher?) As backup for extra hot
> days/stuck in traffic?
> >
> > Pete
> > --
> > Cary, NC
> >
> > No Coach yet but likely center kitchen, dry side bath Royale, 78, 403,
> hopefully with good original white Imron paint.
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
From what I understand. Zed was backing off on GMC work at the time Barb's work was done. And Barb's cooling issues became known by many because she was just trying to solve a problem that she was still having. After the work was completed. And many wanted to know why she was still having over heating issues. Many talented guys have tried unsuccessfully to get an electric fan to work. And I could only list the equipment, and wire sizes installed. I do think it's important to put out to GMC owners. That electric fans at his point just aren't a viable idea. I'm just trying to fix her problem with a free fan, shroud, and labor. She bought a new fan clutch. I think it's so neat that she's out there with her dog. Traveling the roads of this country. So I'm putting in my 2 cents of time to help her meet her dreams. Bob Dunahugh

Barb said it was Zeb, or his son. Aluminum Radiator, fan, belts, 80 amp alternator, and some exhaust gaskets. I think that was all she said. At close to $5,000. Seems fair. Right? We talked tonight on the plan. Trans is going in Thursday/Friday. We all played today. So tomorrow I'm starting at the front. Going to check everything till I get to the rear. Then buff the paint. And paint the black trim around the windows. I want it to run, and look good. Probably be a two week job. She's going to help Linda. So I'm going to be on the no labor plan. Bob Dunahugh

A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her that he could put in an electric fan that would be better then the stock fan, and shroud. It couldn't pull in enough air to cool the 455 on hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring. He put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The relay fried. So I put the highest amp switch in that I could find. 35 amp. And told her to turn the fan on in town, and for hills only to get her the 500 miles to my house. How the wire held up. I don't know. But it did. She said that the switch was getting hot at times. I can't remember the name of the guy that ripped her off. It's discussing. Just not right what he charged her. Somebody must know his name. Bob Dunahugh
 
> And Barb's cooling issues became known by many because she was just trying to solve a problem that she was still having. After the work was completed. And many wanted to know why she was still having over heating issues.


Has a cracked head or defective head gasket been ruled out as a source of her overheating problem?

I fought overheating issues for a long time and tried everything - radiators, fan clutches, timing, thermostats… The Eureka Moment was when I started the coach for the first time of the year and noticed liquid coolant peeing out of the exhaust pipe and voluminous white smoke. Upon pulling the driver side head I found not only a crack in the head but also the OEM head gasket was corroded and in very bad shape.

My overheating problem only appeared during high engine load. Driving around town or cruising on the Interstate at 55MPH - normal engine temps. Climbing hills or cruising at 65MPH - overheating.

Some pics (and what I speculate was the cause of the original crack) at: http://www.jcmco.com/gallery/album28

Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
 
One of the reasons GM started using factory installed Barsleak. I'm not big on "fix it in a can" but in this case it makes sense as it nips invisible
internal leaks and prevents the continuing head gasket degredation mentioned above. A simple dose when you do your every 2 year coolant drain and fill
(everyone does that right on schedule regardless of miles right???) will keep the small problems from developing into big ones. Of course a cracked
head is reason for surgery to fix correctly, but I think it's a good insurance to keep coolant where it belongs. On the overheating coach ---wouldn't
a properly executed pressure test relieved the issue in the first billable hour?
--
John Lebetski
Woodstock, IL
77 Eleganza II
 
Whn did they stop using the Ginger Root pills that they used for years? My
personal experience with Barsleak was not very good.

Gary Kosier
77PB w/500Cad
Newark, Ohio

--------------------------------------------------
From: "John R. Lebetski"
Sent: Wednesday, April 12, 2017 10:00 AM
To:
Subject: Re: [GMCnet] YES. An electric fan.

> One of the reasons GM started using factory installed Barsleak. I'm not
> big on "fix it in a can" but in this case it makes sense as it nips
> invisible
> internal leaks and prevents the continuing head gasket degredation
> mentioned above. A simple dose when you do your every 2 year coolant drain
> and fill
> (everyone does that right on schedule regardless of miles right???) will
> keep the small problems from developing into big ones. Of course a
> cracked
> head is reason for surgery to fix correctly, but I think it's a good
> insurance to keep coolant where it belongs. On the overheating
> coach ---wouldn't
> a properly executed pressure test relieved the issue in the first billable
> hour?
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
I don't think GM changed. Bart's is marketing the same ginger root "pills" in blister paks labeled Barrs Stop Leak.

Emery Stora

>
> Whn did they stop using the Ginger Root pills that they used for years? My personal experience with Barsleak was not very good.
>
> Gary Kosier
> 77PB w/500Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "John R. Lebetski"
> Sent: Wednesday, April 12, 2017 10:00 AM
> To:
> Subject: Re: [GMCnet] YES. An electric fan.
>
>> One of the reasons GM started using factory installed Barsleak. I'm not big on "fix it in a can" but in this case it makes sense as it nips invisible
>> internal leaks and prevents the continuing head gasket degredation mentioned above. A simple dose when you do your every 2 year coolant drain and fill
>> (everyone does that right on schedule regardless of miles right???) will keep the small problems from developing into big ones. Of course a cracked
>> head is reason for surgery to fix correctly, but I think it's a good insurance to keep coolant where it belongs. On the overheating coach ---wouldn't
>> a properly executed pressure test relieved the issue in the first billable hour?
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
She's hasn't been adding coolant. But adding a qt of oil at about 1,000 miles. Nothing out the tail pipe. I understand that Zeb has done good work over the years. He talked her into the electric fan. She wasn't in favor of it. Her shroud was broken, and gone. She wanted a shroud with the aluminum radiator. The reality here is that Barb could have lost a good running 455 over this. I don't knock what others do. But this? The electric fan was his idea to push. And there hasn't been one person that thinks electric fans work in our application. I wish Zeb the best. Bob Dunahugh

From what I understand. Zed was backing off on GMC work at the time Barb's work was done. And Barb's cooling issues became known by many because she was just trying to solve a problem that she was still having. After the work was completed. And many wanted to know why she was still having over heating issues. Many talented guys have tried unsuccessfully to get an electric fan to work. And I could only list the equipment, and wire sizes installed. I do think it's important to put out to GMC owners. That electric fans at his point just aren't a viable idea. I'm just trying to fix her problem with a free fan, shroud, and labor. She bought a new fan clutch. I think it's so neat that she's out there with her dog. Traveling the roads of this country. So I'm putting in my 2 cents of time to help her meet her dreams. Bob Dunahugh

Barb said it was Zeb, or his son. Aluminum Radiator, fan, belts, 80 amp alternator, and some exhaust gaskets. I think that was all she said. At close to $5,000. Seems fair. Right? We talked tonight on the plan. Trans is going in Thursday/Friday. We all played today. So tomorrow I'm starting at the front. Going to check everything till I get to the rear. Then buff the paint. And paint the black trim around the windows. I want it to run, and look good. Probably be a two week job. She's going to help Linda. So I'm going to be on the no labor plan. Bob Dunahugh

A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her that he could put in an electric fan that would be better then the stock fan, and shroud. It couldn't pull in enough air to cool the 455 on hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring. He put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The relay fried. So I put the highest amp switch in that I could find. 35 amp. And told her to turn the fan on in town, and for hills only to get her the 500 miles to my house. How the wire held up. I don't know. But it did. She said that the switch was getting hot at times. I can't remember the name of the guy that ripped her off. It's discussing. Just not right what he charged her. Somebody must know his name. Bob Dunahugh
 
I think we should be talking about Zeb Jr. From what I hear, Zeb, who was
a well-regarded GMC mechanic from 1976 until a couple of years ago, had
turned the business over to Zeb Jr. The company had gotten away from GMC
specialization and into SOB's several years ago. On some SOB's, including
a couple of 454-powered ones I owned "back when", electric fans are a
worthwhile addition.

Ken H.

> She's hasn't been adding coolant. But adding a qt of oil at about 1,000
> miles. Nothing out the tail pipe. I understand that Zeb has done good work
> over the years. He talked her into the electric fan. She wasn't in favor
> of it. Her shroud was broken, and gone. She wanted a shroud with the
> aluminum radiator. The reality here is that Barb could have lost a good
> running 455 over this. I don't knock what others do. But this? The
> electric fan was his idea to push. And there hasn't been one person that
> thinks electric fans work in our application. I wish Zeb the best. Bob
> Dunahugh
>
>
>
>
>
> From what I understand. Zed was backing off on GMC work at the time
> Barb's work was done. And Barb's cooling issues became known by many
> because she was just trying to solve a problem that she was still having.
> After the work was completed. And many wanted to know why she was still
> having over heating issues. Many talented guys have tried unsuccessfully to
> get an electric fan to work. And I could only list the equipment, and wire
> sizes installed. I do think it's important to put out to GMC owners. That
> electric fans at his point just aren't a viable idea. I'm just trying to
> fix her problem with a free fan, shroud, and labor. She bought a new fan
> clutch. I think it's so neat that she's out there with her dog. Traveling
> the roads of this country. So I'm putting in my 2 cents of time to help her
> meet her dreams. Bob Dunahugh
>
>
>
> Barb said it was Zeb, or his son. Aluminum Radiator, fan, belts, 80 amp
> alternator, and some exhaust gaskets. I think that was all she said. At
> close to $5,000. Seems fair. Right? We talked tonight on the plan. Trans is
> going in Thursday/Friday. We all played today. So tomorrow I'm starting at
> the front. Going to check everything till I get to the rear. Then buff the
> paint. And paint the black trim around the windows. I want it to run, and
> look good. Probably be a two week job. She's going to help Linda. So I'm
> going to be on the no labor plan. Bob Dunahugh
>
>
>
> A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her
> that he could put in an electric fan that would be better then the stock
> fan, and shroud. It couldn't pull in enough air to cool the 455 on hills.
> He put in 16 gauge wire. with a 20 amp relay. To protect the wiring. He put
> in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The relay
> fried. So I put the highest amp switch in that I could find. 35 amp. And
> told her to turn the fan on in town, and for hills only to get her the 500
> miles to my house. How the wire held up. I don't know. But it did. She said
> that the switch was getting hot at times. I can't remember the name of the
> guy that ripped her off. It's discussing. Just not right what he charged
> her. Somebody must know his name. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
> On the overheating coach —wouldn't a properly executed pressure test relieved the issue in the first billable hour?

I expect mine wouldn’t have indicated a problem during a pressure test because the rate of loss of pressure around rings and valves would have been indistinguishable from the rate of loss through the crack.

The machine neither gained nor lost coolant nor oil under any circumstances - and as I mentioned previously it only exhibited overheating problems when operated at sustained heavy load. My speculation is that the combination of combustion heat and cylinder pressure under those high-load conditions was enough to allow the crack to bleed some amount of combustion products into the coolant passage between the valve pockets. If the engine was not heavily loaded it would hold very close to thermostat temperature under almost all conditions.

Now if I had sent some coolant to Blackstone or a similar lab and they had found combustion products in it…then I would have had my answer right away. Historically I have not used lab testing of fluids as part of my troubleshooting process but I think I’ll be integrating them in the future based on this experience.

—Jim

Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
 
I am running an electric fan setup successfully for almost 7 years now. you need more like 80 amps of power. each one of my fans will move 4500 CFM
but they take 35 amps of current each. one fan works fine but 2 is needed for hot days and on grades. I use a flexalite controller and a separate
relay, the shitty little 30 amp jobs sold in stores wont work you need to order at least 50s off the net. Also wiring, 10 gauge all around an an 8ga
master wire straight from the battery to a fusible link with an appropriate load rated fuse.

> A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her that he could put in an electric fan that would be better then the stock
> fan, and shroud. It couldn't pull in enough air to cool the 455 on hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring. He
> put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The relay fried. So I put the highest amp switch in that I could find. 35 amp. And
> told her to turn the fan on in town, and for hills only to get her the 500 miles to my house. How the wire held up. I don't know. But it did. She
> said that the switch was getting hot at times. I can't remember the name of the guy that ripped her off. It's discussing. Just not right what he
> charged her. Somebody must know his name. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
The pressure test is pressurizing the cooling system, not the combustion chamber. The much higher combustion pressure will make it through where
coolant won't at 13-15 psi. In the tool truck is a detection kit for doing that byproduct test without having to send a sample away. Expensive if you
don't use it to generate income, but it was pretty reliable with the results.
--
Terry Kelpien

ASE Master Technician

73 Glacier 260

Smithfield, Va.
 
Shan,
Can you give me a call as I would like to confer with you on your system.
Putting on a load at high ambient temperatures for a long pull will show
the reliability.

> I am running an electric fan setup successfully for almost 7 years now.
> you need more like 80 amps of power. each one of my fans will move 4500 CFM
> but they take 35 amps of current each. one fan works fine but 2 is needed
> for hot days and on grades. I use a flexalite controller and a separate
> relay, the shitty little 30 amp jobs sold in stores wont work you need to
> order at least 50s off the net. Also wiring, 10 gauge all around an an 8ga
> master wire straight from the battery to a fusible link with an
> appropriate load rated fuse.
>

> > A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her
> that he could put in an electric fan that would be better then the stock
> > fan, and shroud. It couldn't pull in enough air to cool the 455 on
> hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring.
> He
> > put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The
> relay fried. So I put the highest amp switch in that I could find. 35 amp.
> And
> > told her to turn the fan on in town, and for hills only to get her the
> 500 miles to my house. How the wire held up. I don't know. But it did. She
> > said that the switch was getting hot at times. I can't remember the name
> of the guy that ripped her off. It's discussing. Just not right what he
> > charged her. Somebody must know his name. Bob Dunahugh
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
Crap I just wrote a whole response then the net crapped out, I'll try again. Jim, I also failed to mention that I had also upgraded the charging
system to one out of a 1995 northstar caddy. I took the Alt and charging cable which is 6ga. the alt is 140 amps which is plenty to run the fans and
still charge the system. The fans I used I forget the part number but they were from 1989-95 Ford Thunderbird Supercoupe which were supercharged V6s,
the 3.8s were prone to overheating naturally aspirated. so ford made this killer fan that frankly works. I took the fans and shrouds, and staggered
them in a diagonal configuration across the radiator in the GMC. they are a little larger than the rad itself so I had to use some fabrication using
framing brackets from home depot to mount them. I ziptied the centers together where they met to avoid having to run a 3rd support bracket and the
structure proved sound. I used a Flexlite 33055 controller to launch the first fan, and tapped off the power lead to trigger a relay that fires the
second fan, thus not overloading that controllers amp rating, it works very well but you need at least a 50 amp relay. when I first installed this
system I had a stock radiator, and I tested it on the 14 near santa clarita on a 104 degree day. the fans did the job and the coolant rarely got over
200 degrees. With the new Aluminum radiator they almost never come on unless in traffic. at highway speed is good but I have yet to test them on say a
challenging ride like baker grade in july. the system also allows me to put the fans on 100% of the time. They both move a lot of air. the cost for
fans, and alt from PickaPart was like $75 and the controller and hardware were maybe another 150. the aftermarket fans available to consumers via the
auto parts houses suck frankly. I've been looking at making a system by fans from EFE which actually cool 20 ton municipal buses! they also have
applications for OTR trucks. so it should not be too hard to make a real system that can work in our rigs. my setup got me over Tehachapi grade
thought it was winter....

> Shan,
> Can you give me a call as I would like to confer with you on your system.
> Putting on a load at high ambient temperatures for a long pull will show
> the reliability.
>

>
> > I am running an electric fan setup successfully for almost 7 years now.
> > you need more like 80 amps of power. each one of my fans will move 4500 CFM
> > but they take 35 amps of current each. one fan works fine but 2 is needed
> > for hot days and on grades. I use a flexalite controller and a separate
> > relay, the shitty little 30 amp jobs sold in stores wont work you need to
> > order at least 50s off the net. Also wiring, 10 gauge all around an an 8ga
> > master wire straight from the battery to a fusible link with an
> > appropriate load rated fuse.
> >

> >> A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her
> > that he could put in an electric fan that would be better then the stock
> >> fan, and shroud. It couldn't pull in enough air to cool the 455 on
> > hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring.
> > He
> >> put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The
> > relay fried. So I put the highest amp switch in that I could find. 35 amp.
> > And
> >> told her to turn the fan on in town, and for hills only to get her the
> > 500 miles to my house. How the wire held up. I don't know. But it did. She
> >> said that the switch was getting hot at times. I can't remember the name
> > of the guy that ripped her off. It's discussing. Just not right what he
> >> charged her. Somebody must know his name. Bob Dunahugh
> >> _______________________________________________
> >> GMCnet mailing list
> >> Unsubscribe or Change List Options:
> >> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> >
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Tom Pryor sent me the same fan your using.
Have not tried it to gather data. If your using two of them I can see how it will work as long as the power supply is updated.Love to see your unit

Get Outlook for iOShttps://aka.ms/o0ukef
________________________________
From: Gmclist on behalf of Shan Rose
Sent: Wednesday, April 12, 2017 11:54:12 PM
To: gmclist
Subject: Re: [GMCnet] YES. An electric fan.

Crap I just wrote a whole response then the net crapped out, I'll try again. Jim, I also failed to mention that I had also upgraded the charging
system to one out of a 1995 northstar caddy. I took the Alt and charging cable which is 6ga. the alt is 140 amps which is plenty to run the fans and
still charge the system. The fans I used I forget the part number but they were from 1989-95 Ford Thunderbird Supercoupe which were supercharged V6s,
the 3.8s were prone to overheating naturally aspirated. so ford made this killer fan that frankly works. I took the fans and shrouds, and staggered
them in a diagonal configuration across the radiator in the GMC. they are a little larger than the rad itself so I had to use some fabrication using
framing brackets from home depot to mount them. I ziptied the centers together where they met to avoid having to run a 3rd support bracket and the
structure proved sound. I used a Flexlite 33055 controller to launch the first fan, and tapped off the power lead to trigger a relay that fires the
second fan, thus not overloading that controllers amp rating, it works very well but you need at least a 50 amp relay. when I first installed this
system I had a stock radiator, and I tested it on the 14 near santa clarita on a 104 degree day. the fans did the job and the coolant rarely got over
200 degrees. With the new Aluminum radiator they almost never come on unless in traffic. at highway speed is good but I have yet to test them on say a
challenging ride like baker grade in july. the system also allows me to put the fans on 100% of the time. They both move a lot of air. the cost for
fans, and alt from PickaPart was like $75 and the controller and hardware were maybe another 150. the aftermarket fans available to consumers via the
auto parts houses suck frankly. I've been looking at making a system by fans from EFE which actually cool 20 ton municipal buses! they also have
applications for OTR trucks. so it should not be too hard to make a real system that can work in our rigs. my setup got me over Tehachapi grade
thought it was winter....

> Shan,
> Can you give me a call as I would like to confer with you on your system.
> Putting on a load at high ambient temperatures for a long pull will show
> the reliability.
>

>
> > I am running an electric fan setup successfully for almost 7 years now.
> > you need more like 80 amps of power. each one of my fans will move 4500 CFM
> > but they take 35 amps of current each. one fan works fine but 2 is needed
> > for hot days and on grades. I use a flexalite controller and a separate
> > relay, the shitty little 30 amp jobs sold in stores wont work you need to
> > order at least 50s off the net. Also wiring, 10 gauge all around an an 8ga
> > master wire straight from the battery to a fusible link with an
> > appropriate load rated fuse.
> >

> >> A guy In Georgia put an aluminum radiator in her 73 GMC. Then told her
> > that he could put in an electric fan that would be better then the stock
> >> fan, and shroud. It couldn't pull in enough air to cool the 455 on
> > hills. He put in 16 gauge wire. with a 20 amp relay. To protect the wiring.
> > He
> >> put in a 40 amp fuse. That's a plan. As she was leaving Shawnee. The
> > relay fried. So I put the highest amp switch in that I could find. 35 amp.
> > And
> >> told her to turn the fan on in town, and for hills only to get her the
> > 500 miles to my house. How the wire held up. I don't know. But it did. She
> >> said that the switch was getting hot at times. I can't remember the name
> > of the guy that ripped her off. It's discussing. Just not right what he
> >> charged her. Somebody must know his name. Bob Dunahugh
> >> _______________________________________________
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> >
> >
> >
> > _______________________________________________
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> >
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
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The only thing electric fans are good for, IMO, is to supplant the clutch fan in long, hot idle conditions. Even then, it's only to help the a/c
condensor, not the radiator. Such a fan is especially helpful on R134a conversions as they throw a lot more heat at the condensor than R12.
--
Wanting a GMC but must convince the wife first...
 
Gentlemen,

With all due respect I am of the opinion that the engineers at GMC knew what
they were doing when they sized the radiator for the GMC.

If both the air and water loops are kept clean permitting the designed air
and water flow rates the cooling provided will suffice even on the hottest
days.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
 
JimK has shown a system with an electrically operated viscous clutch and a slightly larger and more efficient plastic (actually some esoteric resin
material, probably nylon) fan. It's somewhat lighter than the original, and has a ring around the blade tips to keep the blades from changing shape
at speed.

--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
 
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Applied GMC
GMCMI Fall 2026 Rally

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