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Coolant fans not working

Tiny
STEVESTARNES1
  • MEMBER
  • 1999 OLDSMOBILE INTRIGUE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 134,000 MILES
Coolant fans do not come on, not even by unplugging coolant temperature sensor. I replaced coolant temperature sensor, tested three fan relays, both max fuses, both fan motors, they are all working. Checked as many wires and connectors as I could. What could I have missed?
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Sunday, April 14th, 2019 AT 6:54 PM

3 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

The only other component in the cooling fans circuit is going to be the Power-train Control Module (PCM). You can check the two wires and the PCM connector for any corrosion or unwanted resistance, but other than that I would have to say, by process of elimination, the PCM is bad. Let us know what you are able to find out, please.

Thanks,
Alex
2CarPros
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Sunday, April 14th, 2019 AT 9:12 PM
Tiny
STEVESTARNES1
  • MEMBER
  • 2 POSTS
The information you provided was exactly what I needed to find the problem. Thanks! You are in my favorites list!
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Tuesday, April 16th, 2019 AT 5:50 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

I'm happy you got it fixed, that's awesome. What was the problem, though?

Thanks,
Alex
2CarPros
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Tuesday, April 16th, 2019 AT 6:09 AM

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