Vintage air under dash

T

Thigh19

New member
Aug 4, 2019
86
0
1
So I’ve bought the vintage air slim line under dash unit and the sanden compressor installed, just need to hook them up. What I’d like to do is
plumb the lines so I can use the factory air and the vintage air off the same pump. What I’m seeing is everyone uses the factory for heat and the
aftermarket as primary. Has anyone done both like I’d like to do? Is it just better to use just the vintage air and not the factory unit?
I need to know how and where to tee off the lines to use both. Pics would be a plus.
Thanx in advance,
Thom
73 Sequoia
Vancouver Washington
 
Had you kept the A6 compressor, others have run 2 evaporators that way. Can’t say about the Sanden which has less capacity. The Y hoses are always
what got in the way of me trying to add rear AC, but I think Applied has them now. The Y should be welded in the aluminum tubing section, like GM
would do for rear AC in a Suburban or van
--
John Lebetski
Woodstock, IL
77 Eleganza II
 
John,
We have been supplying the larger capacity Sanden units , so it works well
with the add on unit.

On Wed, Sep 8, 2021 at 6:29 PM John R. Lebetski
wrote:

> Had you kept the A6 compressor, others have run 2 evaporators that way.
> Can’t say about the Sanden which has less capacity. The Y hoses are always
> what got in the way of me trying to add rear AC, but I think Applied has
> them now. The Y should be welded in the aluminum tubing section, like GM
> would do for rear AC in a Suburban or van
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
Thom,
You should have received the instruction on mounting and connection.
If you did not call me.

> John,
> We have been supplying the larger capacity Sanden units , so it works well
> with the add on unit.
>
>
> On Wed, Sep 8, 2021 at 6:29 PM John R. Lebetski

>
>> Had you kept the A6 compressor, others have run 2 evaporators that way.
>> Can’t say about the Sanden which has less capacity. The Y hoses are always
>> what got in the way of me trying to add rear AC, but I think Applied has
>> them now. The Y should be welded in the aluminum tubing section, like GM
>> would do for rear AC in a Suburban or van
>> --
>> John Lebetski
>> Woodstock, IL
>> 77 Eleganza II
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk
> http://www.gmcrvparts.com
> 1-800-752-7502
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
I purchased the larger Sanden from Jim a few months ago and is working well with my original dash evaporator and an 18,000 btu evaporator in parallel.

Emery Stora

>
> Thom,
> You should have received the instruction on mounting and connection.
> If you did not call me.
>

>>
>> John,
>> We have been supplying the larger capacity Sanden units , so it works well
>> with the add on unit.
>>
>>
>> On Wed, Sep 8, 2021 at 6:29 PM John R. Lebetski

>>
>>> Had you kept the A6 compressor, others have run 2 evaporators that way.
>>> Can’t say about the Sanden which has less capacity. The Y hoses are always
>>> what got in the way of me trying to add rear AC, but I think Applied has
>>> them now. The Y should be welded in the aluminum tubing section, like GM
>>> would do for rear AC in a Suburban or van
>>> --
>>> John Lebetski
>>> Woodstock, IL
>>> 77 Eleganza II
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>> Jim Kanomata ASE
>> Applied/GMC, Newark,CA
>> jimk
>> http://www.gmcrvparts.com
>> 1-800-752-7502
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk
> http://www.gmcrvparts.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
 
Not only different sizes but mine came with the GM fitting at the rear so my original hoses fit to it with no modifications.

As to installing another evaporator in parallel you can get hoses for the new evaporator that have an end that will connect to the OEM evaporator. See my picture site that I did several years back.

http://www.gmcmhphotos.com/photos/g3356-aux-air-conditioner-evaporator.html

Emery Stora

> There’s your answer! And I learned Sandens come in different sizes.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
 
Thom,
I can supply the instructions so you can be familiar.

> Like what you did, need more info on the plumbing with 2 evaporators
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
> There’s your answer! And I learned Sandens come in different sizes.

Not only different sizes, but they even make "hot rod" versions of the same size compressor. For example, you have the standard SD7-H15, then they
make an "enhanced" version of the same compressor. From what I read, it has tighter tolerances and a bigger "cam" to get more capacity. Its designed
for use on buses, ag equipment, etc. The SD7-H15 Enhanced Actually has nearly the same capacity as the A6.

https://www.sanden.com/sd7e.html
--
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
 
Before I was able to get my vent work in the dash under control, I had the under dash unit installed.

My comments will go up and down here so bear with me.

They used the OEM GM compressor saying it had plenty of capacity for both the OEM system and the Newly installed
under dash system.

It was installed and as I ran it, I had plenty of cold air from the under dash unit and from the OEM ac vents.

They tied the hoses (freon) under the drivers deck, which would prove problematic later.

I left the heat of Florida and headed home, thoroughly enjoying the cool AC. So the unit works well.

But as I approached Chicago, I noticed that the GMC was warming up inside. By the time I was home, the AC was
dead again.

I had the mechanic go over the system and found the fittings under the floor were not completely tight and all the
gas leaked out.
This seems typical for this shop that did the work.

BE VERY SURE that your fittings are correctly tightened to prevent gas leakage from the system.

As for operation, when it worked, the underdash unit put a lot of COLD air out and with the OEM system assisting
pushing cold air through the dash vents, The RV temps can be controlled easily.

They kept the OEM GM AC compressor saying it had plenty of capacity for the additional under dash unit and
I can't dispute that as it did cool the inside of the RV very well.

I dont know anything about the Sandas unit but if it has the capacity of the GM OEM unit, it should do fine.
--
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
UBUNTU VOYAGER - Berzin Auto Center
 
Thom,
Get hold of me for instructions.

> Before I was able to get my vent work in the dash under control, I had the
> under dash unit installed.
>
> My comments will go up and down here so bear with me.
>
> They used the OEM GM compressor saying it had plenty of capacity for both
> the OEM system and the Newly installed
> under dash system.
>
> It was installed and as I ran it, I had plenty of cold air from the under
> dash unit and from the OEM ac vents.
>
> They tied the hoses (freon) under the drivers deck, which would prove
> problematic later.
>
> I left the heat of Florida and headed home, thoroughly enjoying the cool
> AC. So the unit works well.
>
> But as I approached Chicago, I noticed that the GMC was warming up
> inside. By the time I was home, the AC was
> dead again.
>
> I had the mechanic go over the system and found the fittings under the
> floor were not completely tight and all the
> gas leaked out.
> This seems typical for this shop that did the work.
>
> BE VERY SURE that your fittings are correctly tightened to prevent gas
> leakage from the system.
>
> As for operation, when it worked, the underdash unit put a lot of COLD air
> out and with the OEM system assisting
> pushing cold air through the dash vents, The RV temps can be controlled
> easily.
>
> They kept the OEM GM AC compressor saying it had plenty of capacity for
> the additional under dash unit and
> I can't dispute that as it did cool the inside of the RV very well.
>
> I dont know anything about the Sandas unit but if it has the capacity of
> the GM OEM unit, it should do fine.
> --
> GatsbysCruise. \
> 74GMC260 Former Glacier Model style. \
> Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS
> FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
> UBUNTU VOYAGER - Berzin Auto Center
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
You must log in or register to reply here.
GMCMI Spring 2026 Rally
Applied GMC

Share this page

Share this page
Top Bottom
Back