| thermostat [message #157342] |
Thu, 19 January 2012 19:32  |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
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Tried to get the robert-shaw 330-180 thermstat recomended in the gmc info site and auto zone said it was recalled out of the stores and advanced auto parts doesn't carry robert shaw at all. Are there any other good thermostats recomended
Skip
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: thermostat [message #157344 is a reply to message #157342] |
Thu, 19 January 2012 19:44  |
shawnee
Messages: 422
Registered: February 2004
Location: NC
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| skip2 wrote on Thu, 19 January 2012 20:32 |
Tried to get the robert-shaw 330-180 thermstat recomended in the gmc info site and auto zone said it was recalled out of the stores and advanced auto parts doesn't carry robert shaw at all. Are there any other good thermostats recomended
Skip
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Skip,
Try Stewart Racing and get the thermostat without the 3 holes drilled in the cup. Do not get one from Mr. Gasket since it has a built in bypass for street rods. Robertshaw thermostats are getting harder to find. Jim Kanomata still sells them and the price is about the same as Stewart Racing. Before you install it try putting your mouth around the cup and blowing. If you can blow through it, I wouldn't use it. Your engine temperature will be well below the 180 degrees.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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| Re: thermostat [message #157364 is a reply to message #157342] |
Thu, 19 January 2012 22:13 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| skip2 wrote on Thu, 19 January 2012 19:32 |
Tried to get the robert-shaw 330-180 thermostat recommended in the gmc info site and auto zone said it was recalled out of the stores and advanced auto parts doesn't carry robert shaw at all. Are there any other good thermostats recommended
Skip
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Call Jim K. at Applied GMC. He has them.
The Robert Shaw thermostat was NOT recalled. Auto Zone just quit handling that brand and dropped them from their computer listing.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: thermostat [message #157397 is a reply to message #157344] |
Fri, 20 January 2012 11:16 |
bukzin
Messages: 840
Registered: April 2004
Location: North California
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If you can blow through it, I wouldn't use it. Your engine temperature will be well below the 180 degrees.[/quote]
++++++++++++++++++++++++++++++++++++++++++++++++++
Gene, Do you mean the engine temp will be below 180
with the correct thermostat?
How does the 'blow test' relate to this?
Thanks!
Bukzin
1977 Palm Beach
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| Re: thermostat [message #157419 is a reply to message #157397] |
Fri, 20 January 2012 15:19 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
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| bukzin wrote on Fri, 20 January 2012 12:16 |
If you can blow through it, I wouldn't use it. Your engine temperature will be well below the 180 degrees.
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++++++++++++++++++++++++++++++++++++++++++++++++++
Gene, Do you mean the engine temp will be below 180
with the correct thermostat?
How does the 'blow test' relate to this?
Thanks![/quote]
The engine temperature will be lower than the thermostat rating due to a large bypass built in the thermostat. This seems to work in street rods but not in our coaches. I used the MR Gasket 180 degree thermostat and on level ground the engine would run at 160 to 170 degrees. The blow test checks to see if there is a bypass built into the thermostat. You might get a very small leak through and this would be OK,but if you can stand and breathe easily through the thermostat for two or three minutes, I wouldn't use it.
The thermostat works well in controlling the engine temperature in a car and this thermostat was designed for automobiles. It will control within a 10 degree range, but when it opens wide on a hill or mountain it is doing everything it can. From then on you are at the mercy of the radiator and water pump capacity as well as the ambient temperature.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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| Re: [GMCnet] thermostat [message #157435 is a reply to message #157428] |
Fri, 20 January 2012 18:46 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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I have a Scangauge on my Colorado. Colorados come standard with a 180 thermostat and you can not even buy a 195 for it. On the Scanguage I can watch the temperature as reported to the engine computer as I go down the road. At 20 degrees F OAT the engine temperature very seldom gets to the 180 mark. It usually runs around 172 to 177. On the rare occasion that is hits 180 or 181 you can see the thermostat open and the engine temp will immediately drop to 172 or 173. My point is there was enough cooling with the air blowing by the engine and the additional heat exchanged in the cabin heater that the the radiator coolant is not needed.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] thermostat [message #157441 is a reply to message #157428] |
Fri, 20 January 2012 20:39 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
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| Robert Mueller wrote on Fri, 20 January 2012 18:34 |
Gene,
I would like to interject something here.
Double Trouble has a cheap Harbor Freight water temp gage and a Digi Panel. It ran at the thermostat temperature (195° F) with the
OEM radiator in it. When I replaced it with one of your aluminum radiators I installed the non bypass 180° F Robertshaw thermostat.
I find on cool days the engine runs below 180° F as read on both instruments.
I'm guessing that this is caused by the increased efficiency of the radiator and the amount of flow through the bypass neck in the
thermostat housing.
Waaadaayah reckon?
Regards,
Rob M.
-----Original Message-----
From: Gene Dotson
The engine temperature will be lower than the thermostat rating due to a large bypass built in the thermostat. This seems to work
in street rods but not in our coaches. I used the MR Gasket 180 degree thermostat and on level ground the engine would run at 160
to 170 degrees. The blow test checks to see if there is a bypass built into the thermostat. You might get a very small leak
through and this would be OK,but if you can stand and breathe easily through the thermostat for two or three minutes, I wouldn't use
it.
The thermostat works well in controlling the engine temperature in a car and this thermostat was designed for automobiles. It will
control within a 10 degree range, but when it opens wide on a hill or mountain it is doing everything it can. From then on you are
at the mercy of the radiator and water pump capacity as well as the ambient temperature.
Gene
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Rob,
I think you are right. I usually run about 5 degrees below the thermostat temperature rating. I have also found that the thermostats will vary + or - 5 degrees opening from the thermostat rating. I don't think this is a problem but it does explain the variation in temperature that people see on their engine..
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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