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Ask GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience:  GM Grand Master Technician 2007. 11 years experience.
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98 cavalier: cooling fan doesnt work..replaced fuses, sensors.

Customer Question

98 cavalier 2.2 liter. cooling fan doesnt work unless a/c is turned on. replaced fuses, sensors. i wired it up so it does work all the time. whats going on?
Submitted: 5 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 5 years ago.
Welcome. Is the check engine light on?
Customer: replied 5 years ago.
no the check engine light is not on. the coolant light does come on every once in a while but the radiator and overfill tank are full of coolant.
Expert:  GM Tech (Cam) replied 5 years ago.
OK, does the engine overheat at all?
Customer: replied 5 years ago.
before i wired up the fan so it stays on all the time yes it did overheat. but it would only overheat when i was at an idle at a stop sign or stop light
Expert:  GM Tech (Cam) replied 5 years ago.
OK, did you check the wiring for the sensor to the computer? The PCM controls this. With the AC turning it on, that indicates the control is working, but the fact the engine sensor does not, indicates a sensor issue or a pressure issue. Does the gauge work and what does it show?
Customer: replied 5 years ago.
the temp gauge works, it usually reads around 180 to 200 when im driving but when i was at an idle it would climb almost to the red. and since its a 4 cylinder and i know the head can crack easily i wired it up so it stays at a normal temp. i have replaced the coolant temp sensor and fuses that are in the engine compartment
Customer: replied 5 years ago.
no i havent checked the wiring for the sensor to the computer
Expert:  GM Tech (Cam) replied 5 years ago.
I strongly recommend that you do that. The wire colours are yellow and brown. Check then all the way starting at the engine and places where it can break from the movement.
Customer: replied 5 years ago.
where at on the engine would they start? which color is ground?
Expert:  GM Tech (Cam) replied 5 years ago.

Brown is the engine ground and I would start at the sensor in the pipe and work your way to the PCM.Object Number: 204329  Size: SH

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