Matt thanks for getting back to me. Here=E2=80=99s how the day went. I left=
the thermostat in when we left the campground thinking maybe it was fluke =
the first time since I drove it for a few hours without issue and then star=
ted to overheat. Well I was very wrong. We got 15mins down the highway and =
I could smell coolant no sooner did I pull over the engine shutdown. Let it=
cool down. Pulled the thermostat, topped of the fluid and started back dow=
n the road. Drove 55mph 300 miles with zero issue. We stopped a handful of =
times just to make sure we weren=E2=80=99t overheating anything and everyth=
ing seemed normal. I figured it was a fairly mild day temp wise and we were=
n=E2=80=99t going to be sitting in any traffic(hopefully) so there was goin=
g be a decent amount of cool air all day and she ran fine all day. Funny yo=
u said that about the heater. We were driving and Jen asked me why it was w=
arm in the cab felt like the heat was on. I told her it was. Gotta keep th=
e motor cool. She wasn=E2=80=99t thrilled but we managed. Haha. We=E2=80=
=99re going to keep chugging along tomorrow till we hit the coast and get t=
o a shop to do the radiator. Hopefully the rest will keep going smoothly. =
JimD Sent from my iPhone > On Mar 14, 2018, at 5:45 PM, Matt C=
olie wrote: > > Thread preserved - sorry > =
> Jimmy, > > The problem is that the engine without any restrictio=
n to flow may do something called "channeling". This is a situation well =
understood by > hydorlosists and just about nobody else. What it means i=
s the the coolant flow might get to a flow with a high enough Reynolds numb=
er (kind of like > flow rate) that causes it to not mix with the laminar =
boundary layer near the surfaces you are trying to cool. It just goes righ=
t on by... > > This is why the late Joe Mondello used to ship the en=
gines he built with just a restrictor plate. > > If you remove the t=
'stat and run that way, just use the thinking thing that is so common among=
GMC owners and so rare in the general population. > > When you get =
the t'stat out, you can do the old Pot on a Stove test. Then you will know=
if it is opening when it should. This is all stuff that you > can handl=
e. You would seem to have an IQ over 80 and be literate, that puts you two=
ahead of most of those people that you might end up paying to do > this.=
> > Can you do a 600 mile run this way? With care, yes. If you th=
ink you have trouble, turn on the cab heater. That is a by-pass circuit, b=
ut it is > only open when heating. > > Matt > > > Jimmy_=
rm how long are we talking. We're just outside Las Vegas and we're supposed=
to head to the Grand Canyon, but weather >> isn't going to be on our sid=
e for the next couple weeks going that way. So the plan now is to just B-li=
ne it to San Jose/San Fran area 568 miles >> from where we are. The acces=
sibility of service shops that way is in our favor as well. So I'm sure I'=
ll be calling JimK or Manny in our travel to >> check there schedules. =
>> Thanks JimD >> Sent from my iPhone >> >>> On Mar 14, 2018, at =
2018 20:01 >>>> A little update. We left Las Vegas and drove out to the =
Valley of Fire state park. The rig did go until we climbed a bit of hill th=
en the >> gauge >>>> jumped up to about 3/4temp. Didn't get any further=
than that. Coolant boiled for a minute but there is water in the system as=
well as coolant >> from >>>> when we overheated the other day. The tem=
p reading on the thermostat housing was 220. The hose to the radiator was 1=
85. I checked the new >> clutch fan >>>> with the motor off and it'll o=
nly spin maybe an 1/8 of a turn compared to the free spinning it was doing =
the other day. Not sure what the >> readings >>>> should be on the IR g=
un but that's what it was when we stopped at our campsite. Thanks again guy=
s >>>> JimD >>> >>> Jim, >>> >>> That is way too much dispari=
ty between the T'stat housing and the radiator tank. This has three possib=
le causes: >>> 1 - The thermostat has failed closed >>> 2 - The coolan=
t pump is non-functional >>> 3 - There is some blockage in the radiator c=
ircuit. >>> >>> While all three are real possibilities, only number o=
ne is something you can tackle outside of a shop. I suggest that at the st=
art of the >>> day and >>> while it is still cool, you drop some of the=
coolant into a clean container and remove the thermostat altogether. Whil=
e it is not advised to >>> run this >>> way (long story, but believe it=
), for the short term you should be OK. >>> >>> Matt >>> -- >>>=
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES >>> El=
ectronically Controlled Quiet Engine Cooling Fan >>> OE Rear Drum Brakes=
with Applied Control Arms >>> SE Michigan - Twixt A2 and Detroit >>> =
>>> _______________________________________________ >>> GMCnet mailing=
list >>> Unsubscribe or Change List Options: >>>
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gmcnet.org > > > -- > Matt & Mary Colie - '73 Glacier 23 - Memb=
ers GMCMI, GMCGL, GMCES > Electronically Controlled Quiet Engine Cooling=
Fan > OE Rear Drum Brakes with Applied Control Arms > SE Michigan - T=
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