My fan only kicks on when i turn on the ac

2002 CHEVROLET CAVALIER
89,000 MILES • 2.4L • 4 CYL • FWD • AUTOMATIC
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KELLY0203
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  • 4 POSTS
When my car is running the fan seems to never turn on. When the tempature is at 195- 200...the only way to stop the car from over heating is to have the fan turn on from turning on the ac on. Its not the relay or the fan itself cause they where checked , and I was told it could be the master sensor also known as the ect sensor .
Oct 22, 2014 at 1:11 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
I haven't looked at the specs on your vehicle, but, some fans won't turn till about 220 degrees F.

I'll check your specs, but, 200 degrees F doesn't sound like it is overheating.
Oct 22, 2014 at 2:03 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Our info says the pcm commands the cooling fan on, if temp exceeds about 223 degrees F. There are a couple of other conditions that can turn on the fan, like turning on the ac.
Oct 22, 2014 at 2:28 PM
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