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Discussion Starter #1
I have the car now for almsot three years but just never had the time to do the research, She has 82k and is an automatic.
Previous owner who had it and said he always had to keep the climate control set to auto and at 70. If it's not on auto, the temp shoots up fairly quickly.
When left on auto at 70, it can idle all you want and the temp sits at 180 give or take a few without issue even on a hot summer day.
If it helps, both the AC and Heat work well as do all of the fan speeds.
I am not sure if its a thermostat issue, or if there is a relay issue maybe? I know the car is getting there age wise and things need to be changed so I just wanted to know if anyone had the same issue and what fix did they use? Also, please let me know if you know of any other common red flags in regards to the fans and cooling that I can get a head start on?
Again, I am not really sure of what components there are between the climate control and the fans so any suggestions would be greatly appreciated.
Thanks in advance guys (y)
 

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I am guessing electric then ? I have been helping a friend with his 86 which is electric.
Make sure your fan is coming on when AC is off. If a thermostat issue would think you would have overheating all the time.
What year is this ?
 

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Discussion Starter #5
It’s a 92 LT1. the ac does blow hot or cold depending on what I have it set to of course, but unless it is set to auto, the temp will rise. It’s the weirdest thing I have ever seen.
 

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Sitting static,climate control off,temp will rise to 228 deg on the digital gauge,fan kicks on, temp will drop to 215 then fan turns off.Thats the bone stock factory setting.
 

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What's the temp outside when running 215 degrees? That is high! Sounding like a combination of thermostat, too much concentration of anti-freeze (or air in system), and maybe temp. sensor issue. I have a bone stock '95. When hot out (maybe 85 degrees F) that baby shoots up to about 228-230 degrees F also, but when that point is reached the second fan kicks on (obviously I have the AC on at the time) and the temp will drop to around 94 degrees F, then the process repeats itself. I have a new stock thermostat, new water pump, opticrap, hoses, antifreeze, no air in system, you name it. After the water system rebuilt, under the same conditions, she now runs about 87 degrees F, then on up to 228-230 when hot as hell out, then back down, just like she's supposed to do.
 

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I think what is happening is that when you select "auto 70F" in climate control then either the air conditioning or the heater will be asked to come on in order to maintain the 70F you selected.
The similarity between cooling or heating being selected is that your electric fans come on.
C4's due to the way they pick up air like a vacuum cleaner under the nose are susceptible to two problems one is picking up debris and the second is running hot at low speeds.
I put in a new three row radiator hoping that would solve the problem .
It's improved thing somewhat but I still have to keep my eye on the temperature and sometimes select "auto" on the climate control.
 

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I serviced the cooling system in July,I remember it was in the high 80's.
 
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