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| [GMCnet] running hot [message #134604] |
Thu, 14 July 2011 14:49  |
Dave Motorhome
Messages: 175
Registered: July 2007
Karma: 2
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In driving the GMC around lately it is running hot, now granted it is
~102. But in the past it seems i never go over 195. today i got to 210
and luckily once i pulled off highway it cooled down to 205 (not fast
though). but it has never been that hot. I can not hear any extra fan
kicking on, so:
question 1. nothing wrong?, bad thermostat?, bad fan clutch, bad water
pump? or something else?
any tests or things i can try to narrow it down?
thanks again.. and again.. and.. well you know.
I am sure you feel like i do when my 4 year old asks lots of questions.
--
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
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| Re: [GMCnet] running hot [message #134610 is a reply to message #134604] |
Thu, 14 July 2011 15:11  |
Sandra Price
Messages: 709
Registered: May 2006
Karma: 1
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David, you need to change to a 180 t-stat and check the fan clutch.
Bob Price
On Thu, Jul 14, 2011 at 2:49 PM, David <75glenbrook@gmail.com> wrote:
> In driving the GMC around lately it is running hot, now granted it is
> ~102. But in the past it seems i never go over 195. today i got to 210
> and luckily once i pulled off highway it cooled down to 205 (not fast
> though). but it has never been that hot. I can not hear any extra fan
> kicking on, so:
> question 1. nothing wrong?, bad thermostat?, bad fan clutch, bad water
> pump? or something else?
>
> any tests or things i can try to narrow it down?
>
> thanks again.. and again.. and.. well you know.
> I am sure you feel like i do when my 4 year old asks lots of questions.
>
>
> --
> David Paliotta
> 75 Glenbrook
> Tulsa, OK
> http://75glenbrook.googlepages.com/
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
IN GOD WE TRUST!
Sandra and Bob in the 52nd Year of our State of Marriage
“Life’s a Trip” in “The Roadhouse”
’73 Painted Desert
Huntsville, TX
Finally, all of you, live in harmony with one another, be sympathetic, love
as brothers, be compassionate and humble. Do not repay evil with evil or
insult with insult, but with blessing, because to this you were called so
that you may inherit a blessing. --1 Peter 3:8-9
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| Re: [GMCnet] running hot [message #134612 is a reply to message #134609] |
Thu, 14 July 2011 15:27 |
Sandra Price
Messages: 709
Registered: May 2006
Karma: 1
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We can hear our fan clutch when it kicks in.
Bob
On Thu, Jul 14, 2011 at 3:09 PM, David <75glenbrook@gmail.com> wrote:
> it might be, when its at 210, i am going 60 on the highway, so i do
> not hear anything.
>
> David Paliotta
> 75 Glenbrook
> Tulsa, OK
> http://75glenbrook.googlepages.com/
>
> On Thu, Jul 14, 2011 at 3:07 PM, <roy@gmcnet.org> wrote:
> >
> >
> > Your clutch fan should be kicking in right around 210.
>
>
> --
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
IN GOD WE TRUST!
Sandra and Bob in the 52nd Year of our State of Marriage
“Life’s a Trip” in “The Roadhouse”
’73 Painted Desert
Huntsville, TX
Finally, all of you, live in harmony with one another, be sympathetic, love
as brothers, be compassionate and humble. Do not repay evil with evil or
insult with insult, but with blessing, because to this you were called so
that you may inherit a blessing. --1 Peter 3:8-9
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| Re: [GMCnet] running hot [message #134614 is a reply to message #134604] |
Thu, 14 July 2011 15:37 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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David,
A 50/50 mixture of water and ethylene glycol antifreeze in the cooling
system will boil at 225° if the cap is open. But pressurizing the system
with a spring-loaded cap raises the boiling temperature of the mix about 3°
for every 1 psi of pressure. With a 15 psi cap, the boiling temperature will
be up around 265° F. I would do the
simple things first. Check the cap. I think the GMC recommended is 9 lbs.
Someone please correct me if I'm wrong on that.
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
----- Original Message -----
From: "David" <75glenbrook@gmail.com>
To: <gmclist@temp.gmcnet.org>
Sent: Thursday, July 14, 2011 12:49 PM
Subject: [GMCnet] running hot
> In driving the GMC around lately it is running hot, now granted it is
> ~102. But in the past it seems i never go over 195. today i got to 210
> and luckily once i pulled off highway it cooled down to 205 (not fast
> though). but it has never been that hot. I can not hear any extra fan
> kicking on, so:
> question 1. nothing wrong?, bad thermostat?, bad fan clutch, bad water
> pump? or something else?
>
> any tests or things i can try to narrow it down?
>
> thanks again.. and again.. and.. well you know.
> I am sure you feel like i do when my 4 year old asks lots of questions.
>
>
> --
> David Paliotta
> 75 Glenbrook
> Tulsa, OK
> http://75glenbrook.googlepages.com/
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] running hot [message #134619 is a reply to message #134614] |
Thu, 14 July 2011 15:48 |
Dave Motorhome
Messages: 175
Registered: July 2007
Karma: 2
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Senior Member |
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I have a cap 3 years old. 9 lbs maybe 12.. i will go look, The GMC was
running great, i have just never ran that hot before.
the fluids were chaged last year with a 50 50 mix.,
can i use a local parts store;napa,autozone, advance, orielys.. for
the thermostat? is it an easy install/fix?
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
On Thu, Jul 14, 2011 at 3:37 PM, Gary Worobec <gtw5@earthlink.net> wrote:
> David,
> A 50/50 mixture of water and ethylene glycol antifreeze in the cooling
> system will boil at 225° if the cap is open. But pressurizing the system
> with a spring-loaded cap raises the boiling temperature of the mix about 3°
> for every 1 psi of pressure. With a 15 psi cap, the boiling temperature will
> be up around 265° F. I would do the
> simple things first. Check the cap. I think the GMC recommended is 9 lbs.
> Someone please correct me if I'm wrong on that.
>
> Thanks
>
> Gary and Joanne Worobec
> 1973 GMC Glacier
> Anza, CA
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| Re: [GMCnet] running hot [message #134621 is a reply to message #134619] |
Thu, 14 July 2011 15:59 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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I don't see why not. Gene has some information about thermostats here <http://gmcmotorhome.info/engine.html#stat>
Larry Davick
Fremont, California
The Mystery Machine
'76 (ish) Palm Beach
----- Original Message -----
From: "David" <75glenbrook@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Thursday, July 14, 2011 1:48:49 PM
Subject: Re: [GMCnet] running hot
I have a cap 3 years old. 9 lbs maybe 12.. i will go look, The GMC was
running great, i have just never ran that hot before.
the fluids were chaged last year with a 50 50 mix.,
can i use a local parts store;napa,autozone, advance, orielys.. for
the thermostat? is it an easy install/fix?
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] running hot [message #134630 is a reply to message #134629] |
Thu, 14 July 2011 17:37 |
klassic kampers
Messages: 93
Registered: July 2008
Location: greer,s.c./ellijay,ga
Karma: 0
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Member |
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david, to really check the fan clutch for lock up operation, drive the gmc until hot, remove the hatch and drive again...if your fan clutch locks in , you will definitely know it....
disclaimer on file.
Mike Stewart
1973 GMC 26' Canyonlands /
1973 B.S.A. B50 street tracker-----
Greer,S.C/Ellijay,Ga
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| Re: [GMCnet] running hot [message #134646 is a reply to message #134630] |
Thu, 14 July 2011 19:39 |
Dave Motorhome
Messages: 175
Registered: July 2007
Karma: 2
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Senior Member |
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went for a spin, little stop and go (shich lowered the heat) and
highway 55-60. temp got to 220 per my gauge. no extra fin kick. got
home open the hatch and the fan seemed normal. at idol at home temp
was pretty constant 210.
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
On Thu, Jul 14, 2011 at 5:37 PM, mike stewart
<klassickampers@hotmail.com> wrote:
>
>
> david, to really check the fan clutch for lock up operation, drive the gmc until hot, remove the hatch and drive again...if your fan clutch locks in , you will definitely know it....
> disclaimer on file.
> --
> mike stewart,
> greer,s.c.
>
> 1973 GMC 26' Canyonlands
>
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| Re: [GMCnet] running hot [message #134651 is a reply to message #134648] |
Thu, 14 July 2011 20:16 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Armand,
I think your radiator air dams are brilliant. Using rubber mudflap material makes it weatherproof, pliable, and strong enough for the wind. I like the pre-cut air dams that Jim K sells but before I buy them I might just try something like this.
Larry Davick
Fremont, California
The Mystery Machine
'76 (ish) Palm Beach
----- Original Message -----
From: "Armand Minnie" <armand@minniebiz.com>
To: gmclist@temp.gmcnet.org
Sent: Thursday, July 14, 2011 5:50:19 PM
Subject: Re: [GMCnet] running hot
Dave,
I had some running hot problems and think that I have it figured out. It all started when I replaced the standard temp sender with the recommended NAPA one and my OEM gauge started showing hot. I replaced it with a mechanical gauge and found out that I was running as hot at 240 when going across the desert. I started changing fan clutches and finally installed an aluminum radiator. Drove 7400 miles last summer to the east coast, Canada, and back with no trouble but lots of experimenting. Read my writeup of it at http://minniebiz.com/gmcmotorhome/2011/05/20/gmc-engine-cooling-issues/
--
Armand Minnie
Marana, AZ
'76 Eleganza II
TZE166V103202
http://www.minniebiz.com
use the forum - it's easy
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] running hot [message #134653 is a reply to message #134646] |
Thu, 14 July 2011 20:27 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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[quote title=Dave Motorhome wrote on Thu, 14 July 2011 17:39]went for a spin, little stop and go (shich lowered the heat) and
highway 55-60. temp got to 220 per my gauge. no extra fin kick. got
home open the hatch and the fan seemed normal. at idol at home temp
was pretty constant 210.
Dave that clutch fan from autozone looks like a medium duty fan that is similiar to a Hayden 2747 and it has a similar part #. If you get a Hayden you need a 2797. Or get one from Jim K.
Roy
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] running hot [message #134655 is a reply to message #134619] |
Thu, 14 July 2011 20:34 |
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jaholland
Messages: 565
Registered: June 2010
Location: Sweet Home Alebamy
Karma: 0
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Senior Member |
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| Dave Motorhome wrote on Thu, 14 July 2011 15:48 |
I have a cap 3 years old. 9 lbs maybe 12.. i will go look, The GMC was
running great, i have just never ran that hot before.
the fluids were chaged last year with a 50 50 mix.,
can i use a local parts store;napa,autozone, advance, orielys.. for
the thermostat? is it an easy install/fix?
David Paliotta
75 Glenbrook
Tulsa, OK
http://75glenbrook.googlepages.com/
On Thu, Jul 14, 2011 at 3:37 PM, Gary Worobec <gtw5@earthlink.net> wrote:
> David,
> A 50/50 mixture of water and ethylene glycol antifreeze in the cooling
> system will boil at 225° if the cap is open. But pressurizing the system
> with a spring-loaded cap raises the boiling temperature of the mix about 3°
> for every 1 psi of pressure. With a 15 psi cap, the boiling temperature will
> be up around 265° F. I would do the
> simple things first. Check the cap. I think the GMC recommended is 9 lbs.
> Someone please correct me if I'm wrong on that.
>
> Thanks
>
> Gary and Joanne Worobec
> 1973 GMC Glacier
> Anza, CA
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David:
I have a '403 with an aluminum intake ~
It is a simple job to replace the thermostat ~
~ loosen the 2 thermostat housing bolts `
~ lift up the housing and remove the thermostat and gasket ~
~ Clean off gasket remants from the housing and intake manifold ~
~ Put in the new Robert Shaw 180 thermostat ~
~ Put the gasket in place ~
~ Reattach the thermostat housing ~
~ Tighten he 2 bolts ~
Add Coolant ~
Be Careful when you remove the 2 Thermostat Housing Bolts ~
mine were gualded to the intake manifold and I broke them off ~
{the eazy job then became an expensive one}
~ Joe ~
/_]*[__][] *[__|] ~ * '73 TZE063V101887 "
"
O----------OO--]* ~ '78 TZE168V100234 "
"
" Joe & Lavelle " "
"
'sweet home alebamy'
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| Re: [GMCnet] running hot [message #134659 is a reply to message #134604] |
Thu, 14 July 2011 20:45 |
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With the engine dead, reach in and spin the fan by hand. If there is
resistance, your fan is probably good. If it freewheels with little
or no resistance, it is history.
Most satisfied GMCers have installed the AC Delco 15-4644. Lots have
tried lots of others (including me) and finally got tired of messin
around and just got the Delco. There's a bad apple in every barrel
but 9 times out of 10, you'll be happy with the Delco.
And you WILL hear it when it comes on.
hth
bdub
On Thu, Jul 14, 2011 at 2:49 PM, David <75glenbrook@gmail.com> wrote:
> In driving the GMC around lately it is running hot, now granted it is
> ~102. But in the past it seems i never go over 195. today i got to 210
> and luckily once i pulled off highway it cooled down to 205 (not fast
> though). but it has never been that hot. I can not hear any extra fan
> kicking on, so:
> question 1. nothing wrong?, bad thermostat?, bad fan clutch, bad water
> pump? or something else?
>
> any tests or things i can try to narrow it down?
_______________________________________________
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bdub
bdub.net
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| Re: [GMCnet] running hot [message #134682 is a reply to message #134604] |
Thu, 14 July 2011 22:11 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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1 Again, the thermostat has nothing to do with how hot the engine gets. The thermostat has to do only with how cold the engine gets. Once it is open and the temp rises, it is still open. 195 is the best choice for many other reasons (emissions, sludging, acidic oil, economy, wear and so on)
2 If you pass the "some good drag with the hand spin test" then there is still fluid in the clutch. That's a must. One more thing you can try before replacing the clutch as "bad" is to make sure the bimetal spring on the front is clean. They all weep a tiny bit of silicone fluid and the huge mass of air going by there deposits dirt. It can get so gummed up it won't properly turn the valve in the center to redirect the fluid inside (engage) I use Zep Aerosolve degreaser with an extension tube to spray it off like in parts washing. (a helper is nice to opperate the can while you aim). I suppose a WD-40 type thing would wash it off as well and leave some basic protection, but try to avoid it running down on the belts and pulleys. Jim K also recommended the cleaning the spring trick. I think a lot are prematurely replaced. They are not that complicated. If the bearings are good, the seals are good (still has fluid) and it hasn't been so overheated that the thermal spring is off calibration, it should work.
John Lebetski
Woodstock, IL
77 Eleganza II
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