Question about 1999 Chevrolet Cavalier

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I have a 99 cavalier that is overheating.

I have changed the sensor on the thermostat, the thermostat, and the water pump. As long as the air conditioner is running my car stays cool. When i dont have the air conditioner is not on the fan wont kick on until it gets to hot! Is it the fan? Or could there be another problem?

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  • Chevrolet Master
  • 6,982 Answers

Check your temperature sending unit plug and wiring. if there is any corrosion it can cause the signal to be out of range...If it's out of range it can delay fan start up. Works like this: sender sends info to the computer, computer sends ground signal to relay, relay completes power to the fan. If the fan works on a/c, then the fan motor is good and does not need testing. A/c bypasses auto control and keeps fan on as long as compressor is running.
Also, you can have the system tested using a heat sensing "gun" Your gauge may be off a little on the high side. Unless it is actually overheating, there may not be any problem at all.
The gun test can also detect "cold spots" on the radiator which indicate a flow problem. That too can cause your symptom. Don't forget your radiator is ten years old and likely is nearing the end of it's service life. Internal blockage of core passages is common on older radiators.
As long as you have no external leaks and engine internal gaskets are good, something here has got to help!
Good luck!

Posted on Sep 11, 2009

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I'm having overheating problems with my 99 chev. cavalier. I have already changed the thermostat and the problem continued. So i went all the way in and got the the water pump off, it seems fine, it...


Hello glongoria8 and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1999 Chevrolet Cavalier, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link to:
How to diagnose your overheating Chevrolet Cavalier engine

Anyways if that helps you any little bit, then feel free to follow me on Twitter. That one is at: twitter.com/acoates23234

Thanks for the vote, and good luck!

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please rate well

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