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Old 05-02-2012, 11:46 PM   #1
66olds442
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Possible bad Thermostat?

So my Camaro used to be my daily driver and now sits in my garage for weekend driving (if I get time). I took it down to have the engine oil cooler line adapter replaced (was leaking fluids). Now I notice that my car will slowly go up in temperature till it gets close to 250 and then it will cool back down.

I'm guessing the T-stat is stuck closed and opens when it reaches extreme temps.

Thoughts?
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Old 05-03-2012, 07:14 AM   #2
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Fan sensor could be bad. The fans should fire at around 218 - 220 degrees. Go get that looked at as you can do damage if you overheat the car.
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Old 05-03-2012, 11:56 AM   #3
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Fans work fine. They know the engines really hot. I wouldn't have known my car was getting that hot if my fans hadn't been full speed after a short drive.

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Old 05-03-2012, 12:05 PM   #4
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Check to make sure you didn't get a trash sucked up in front of your radiator and it's blocking wind flow. Happens more often than you think.
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Old 05-03-2012, 12:23 PM   #5
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Quote:
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Check to make sure you didn't get a trash sucked up in front of your radiator and it's blocking wind flow. Happens more often than you think.
Negative. Radiator is clean


Thinking of how a T-stat works (opens to provide cooler coolant to the engine when it reaches a certain temperature) the T-stat makes sense. If the fans or radiator were the problem, the temp would constantly rise and not go down.
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Old 05-03-2012, 12:41 PM   #6
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I'd bet it has an air pocket in the cooling system. They probably lost some coolant fixing the oil cooler, then didn't bleed the cooling system properly.

Start it cold with the rad cap off and let it idle for a few minutes, see if the level goes down while it is idling, and keep topping it off. After it warms up for a couple minutes have someone hold the rpms at about 2000 for about a minute and see if it goes down more, and keep topping it off. Then make sure the surge tank is at the full cold mark. Recheck both the rad and surge tank again the next day to see if it went down more after cooling off.

It's the - you touched it theory. They just messed with the coolant, I'd wager the coolant level they messed with isn't right. They didn't just touch the thermostat, that would be quite a coincidence for that to go bad now.
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Old 05-03-2012, 03:21 PM   #7
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I'd bet it has an air pocket in the cooling system. They probably lost some coolant fixing the oil cooler, then didn't bleed the cooling system properly.

Start it cold with the rad cap off and let it idle for a few minutes, see if the level goes down while it is idling, and keep topping it off. After it warms up for a couple minutes have someone hold the rpms at about 2000 for about a minute and see if it goes down more, and keep topping it off. Then make sure the surge tank is at the full cold mark. Recheck both the rad and surge tank again the next day to see if it went down more after cooling off.

It's the - you touched it theory. They just messed with the coolant, I'd wager the coolant level they messed with isn't right. They didn't just touch the thermostat, that would be quite a coincidence for that to go bad now.
This is also a viable solution. I REALLY doubt the stat went bad, especially on a new car. Either way I would put a 160 degree in there.
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Old 05-03-2012, 04:47 PM   #8
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This is also a viable solution. I REALLY doubt the stat went bad, especially on a new car. Either way I would put a 160 degree in there.
Thats my plan anyways.
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Old 05-03-2012, 08:23 PM   #9
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Well looks like Russell, you were right. Was about half full on coolant. Took it out for a spirited drive just now and hit 210 at the max. Going to check it again when it cools off.

Thanks for your help!
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