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| Re: [GMCnet] Thermostat [message #330255 is a reply to message #330254] |
Fri, 23 March 2018 18:11   |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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You will get all kinds of answers depending on your location. Hot like AZ and TX or Cold like MN or Canada.
I put in a 190 from Jim K and have been happy with it.
How are you measuring the temp and from where. Mechanical gauge I assume. or IR. Is the rest of your cooling system up to snuff. Is the fan clutch operating correctly.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: [GMCnet] Thermostat [message #330256 is a reply to message #330254] |
Fri, 23 March 2018 18:22 |
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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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allan tissot wrote on Fri, 23 March 2018 18:56My temperature gauge is fluctuating from well over 200 down to 165 so I'm pretty sure the thermostat is bad should I put in a 180 or 195
Allan,
With no clue what the coach is or where you are, this is really tough to answer.
But,
What you are seeing could be an artifact of low coolant or a sticking thermostat.
As this is not good for the engine, I suggest that you pull that existing thermostat and do a "Pot on the Stove" test. If any doubt remains, replace it. Either 180° or 195° will do, it mostly depends are where you will be driving.
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: [GMCnet] Thermostat [message #330262 is a reply to message #330254] |
Fri, 23 March 2018 19:24 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Could be low coolant level. Can be cause by bad cap, dirty cap, loose or cracked hose to reservoir, or low reservoir, or a bad stat. They seem to be made of thinner materials these days. I have had good luck with the Stant Superstats with being very accurate in other GM vehicles and they help eliminate the overshoot/ overcompensate feedback cycling. The recommended stats vary in the listings as quality varies. I would go with 190-195. The stat has NOTHING to do with how hot the engine gets. It only conttols how cold it gets.
John Lebetski
Woodstock, IL
77 Eleganza II
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