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My fan only Kicks on when I turn on the AC

Tiny
KELLY0203
  • MEMBER
  • 2002 CHEVROLET CAVALIER
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 89,000 MILES
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.
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Wednesday, October 22nd, 2014 AT 1:11 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
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.
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Wednesday, October 22nd, 2014 AT 2:03 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
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.
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Wednesday, October 22nd, 2014 AT 2:28 PM

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