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1997 Grand Prix Engine Overheating Problems
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szaflsta
New User
Apr 20, 2009, 2:21 PM
Post #1 of 2
(3214 views)
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1997 Grand Prix Engine Overheating Problems
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1997 Pontiac Grand Prix 3.8 engine
My Cars cooling fan for the engine will not turn on, it should turn on when it reaches 200*f but it is turning on when the meter hits 250*f and it is to late.
I have already replaced the fan and the censer, but the fan still wont turn on until the meter reads 250. What could the problem be?
Anyone else face these problems?!
(This post was edited by szaflsta on Apr 20, 2009, 2:28 PM)
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Loren Champlain Sr
Veteran
/ Moderator
Apr 20, 2009, 4:00 PM
Post #2 of 2
(3203 views)
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Re: 1997 Grand Prix Engine Overheating Problems
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szaflsta; I'd have the actual engine temperature accurately measured to be certain. It is not uncommon for GMs to command the fan(s) at 234F. Personally, I agree, seems too hot, but that's how most are. An infra-red temp guage and watching live data on a scanner will help.
With that said...if you are having exhaust gasses entering the cooling system (from a leaky head gasket), you may have air bubbles around the CTS which will cause the problems you are reporting. The CTS must be completely immersed in coolant for it to register correctly. If this uses a seperate switch for the fans, same applies. A cooling system check for exhaust gasses is quite easy. Chemically, or with a gas analyzer.
And, I'm assuming that the cooling system is full and you haven't been having to add to it.
Loren
SW Washington
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