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Old 10-15-2019, 03:05 PM   #15
Russell James


 
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Originally Posted by StingrayblueSS View Post
It's odd that the gauge stops working when this happens I mean this is when you really need it to work.
Many cars do this when a warning comes on, as they want you to follow the warning and not the gauge.

The gauge is only accurate sitting in coolant. Think about what happens in an overheat, air pocket, or loss of coolant. The sensor sitting there at the top of #1 cyl in the head is no longer in coolant. It's reading can drop, fooling the person watching the gauge to think the engine is not screaming hot overheating.

The computer is watching for a certain engine temp rise rate. Outside the norm, set a warning for the cooling system to be checked. If one just relied on the gauge and there was a low coolant condition they could melt the engine down before the coolant temp gauge ever showed a problem.
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Old 10-15-2019, 09:53 PM   #16
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I've had the Mishimoto 169 degree thermostat in for about 50k miles, no problems. Did you check your coolant level in the radiator and overflow tank?
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Old 10-15-2019, 10:35 PM   #17
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While driving today I turned the dic to coolant temp to observe the temperature. It stayed at 163 for about 10 minutes then finally reached 169 then dropped to 167 and eventually got up to 172. This took around 15 minutes. I didn't get the a/c off warning today.
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Old 10-15-2019, 11:35 PM   #18
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Originally Posted by StingrayblueSS View Post
While driving today I turned the dic to coolant temp to observe the temperature. It stayed at 163 for about 10 minutes then finally reached 169 then dropped to 167 and eventually got up to 172. This took around 15 minutes. I didn't get the a/c off warning today.
That's weird man. I run a 160* thermostat and never drop below 172°, and reaches it within 5 mins. I mean, I understand it is a lot cooler up there (especially compared to Florida), but to not reach normal operating temperature in so long is strange to me. My range is 172-200° as my fans are programmed to come on at 196°. Anything above 200° is a rarity.

Maybe I have been out of the cold for too long.

What kind of coolant you running? Makes me wonder if your stat is stuck open.
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Old 10-15-2019, 11:54 PM   #19
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I think it may be stuck open. I use ac delco dexcool
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Old 10-15-2019, 11:54 PM   #20
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Never had this issue, and I've seen a coldest of 173 in the dead of winter.
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Old 10-16-2019, 09:06 AM   #21
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Coldest mine runs
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Old 10-16-2019, 10:27 AM   #22
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Yea, sounds stuck open. I would replace it, it's easy enough.
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