| Thermostat opens early? [message #300184] |
Thu, 05 May 2016 10:09  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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When lat out, the driver (Mary) reported to the engineer (me) that the engine temperature was down again where it used to run. That was about 160°F. I changed out that thermostat a year or two ago. Now it was there again. So, I drained a gallon of coolant, removed the T'stat (it was closed) and did the pot-on-stove test. It opened at about 160°!
This was a first for me.
I have had them fail open and fail to open even in boiling water. But this was new.
Auto Zone had one.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Thermostat opens early? [message #300206 is a reply to message #300184] |
Thu, 05 May 2016 18:17  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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What brand drifted low and what brand did you go with? I put a Stant Super Stat in my Tahoe as the old stat would cycle up and down at cruise overshooting on both low and high. Tapered pintle type is supposed to be more exact and so far is
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Thermostat opens early? [message #300220 is a reply to message #300184] |
Fri, 06 May 2016 07:40 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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The Superstat is a 3 legged type so the one you got Could be one reboxed. Has the pintle design sort of like an EFI IAC valve. Their adverts say 'more flow and more accurate throttling' or something to that effect.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Thermostat opens early? [message #300229 is a reply to message #300227] |
Fri, 06 May 2016 10:56 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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No prob matt
It is your foot😀
On Friday, May 6, 2016, Matt Colie wrote:
> Mr ERFisher wrote on Fri, 06 May 2016 09:54
>> Read here for what we have always used
>> http://gmcmotorhome.info/engine.html#stat
>> --
>> Gene Fisher -- 74-23,77PB/ore/ca
>> "Give a man a fish; you have fed him for today --- give him a URL and
>
> Gene,
>
> I value what you have written, and usually heed it.
> The problem was two fold, Jim Bounds has seen a number of Robert Shaws
> fail by breaking supports and there were none locally available.
>
> Matt
> --
> Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> Now with both true Keyless and remote entry
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> 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://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Thermostat opens early? [message #300312 is a reply to message #300242] |
Mon, 09 May 2016 04:43 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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No problem, MONDELLO would not warranty engine if you used a stat
A stat will only make your engine run hotter,
It cannot cool, I run my 3 GMCs with no stats to fail
😀😀
On Friday, May 6, 2016, Matt Colie wrote:
> Mr ERFisher wrote on Fri, 06 May 2016 11:56
>> No prob matt
>> It is your foot😀
>> --
>> Gene Fisher -- 74-23,77PB/ore/ca
>> "Give a man a fish; you have fed him for today --- give him a URL and
>
> Gene,
>
> I almost hate to tell you this, but the one that went bad was a Robert
> Shaw....
>
> Matt
> --
> Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
> Now with both true Keyless and remote entry
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> 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://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Thermostat opens early? [message #300327 is a reply to message #300312] |
Mon, 09 May 2016 09:32 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Mondello requires that you run a restrictor plate instead of a thermostat which they provide with the motors that they build. At the fall 2010 GMCMI convention in DuQuoin, IL I was parked next to Joe Mondello in the Vendors area. Really a good guy with tremendous knowledge, it was a shame that he died shortly after. Joes put a seminar on building an Olds motor. He talked about his thoughts on not using a thermostat, but using a coolant restrictor plate instead. His comments were that you needed to use some sort of restriction at that point or your motor would never get to a reasonable operating temp. The coolant needs to slow down a little bit in order for it to pick up the heat generated. A number of years ago here on the GMCnet we had this same discussion and Emory provided a quick tutorial on thermodynamics. I will let him comment on this.
Regards,
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On May 9, 2016, at 5:43 AM, gene Fisher wrote:
>
> No problem, MONDELLO would not warranty engine if you used a stat
>
> A stat will only make your engine run hotter,
> It cannot cool, I run my 3 GMCs with no stats to fail
> 😀😀
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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