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Cooling fans

Tiny
THUNDE00
  • MEMBER
  • 1992 OLDSMOBILE 88
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 116,000 MILES
Will a bad crankshaft sensor prevent the cooling fans from kicking on?
Wednesday, September 11th, 2019 AT 5:46 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

No, the fans work on a completely different control than the cranks sensor.

What is the issue?

Roy
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Wednesday, September 11th, 2019 AT 7:28 AM
Tiny
THUNDE00
  • MEMBER
  • 4 POSTS
Fans are not engaging, speedometer doesn't register and A/C compressor won't kick on. However, if you drive it every now and then they will all try to engage, but won't stay on. Replaced the relays, thinking electrical but no tell tale signs.
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Wednesday, September 11th, 2019 AT 7:44 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, the one thing that is in common to all these issues is power. The power comes from the fuse block. The under hood fuse block feeds the cooling fans the one inside the car feeds the other 2 systems. The power for the Ac and the speedometer comes from the under hood fuse block to the inside fuse block.

Run the engine and open the hood. Hit on the fuse block under the hood and see if anything start to work. It may be a bad fuse block.

Also, why did you ask about the crank sensor?

Roy
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Wednesday, September 11th, 2019 AT 8:00 AM
Tiny
THUNDE00
  • MEMBER
  • 4 POSTS
Stalling and idling a little rough was told sensor, I will try the fuse block. Thank you
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Wednesday, September 11th, 2019 AT 8:13 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

The crank sensor will not cause rough running at all.

https://www.2carpros.com/articles/engine-surges

Roy
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Wednesday, September 11th, 2019 AT 8:17 AM
Tiny
THUNDE00
  • MEMBER
  • 4 POSTS
Okay, thank you that gives me a direction at least.
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Wednesday, September 11th, 2019 AT 8:35 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Wednesday, September 11th, 2019 AT 9:06 AM

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