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Does the PCM supply 12 volts to the fan relays.

Tiny
ANONYMOUS
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 194,000 MILES
Does the PCM supply 12 volts to the fan relays? I don`t have voltage at the fan motors, at 220 degrees.
Wednesday, January 2nd, 2013 AT 8:54 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The pcm controls ground for the relays, not voltage. Did you check for voltage at the relays? There are fan fuses in the under hood fuse block. Will the fans run if you turn on the ac? If you unplug the coolant temp sensor will the fans run? Any applicable trouble codes?
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Wednesday, January 2nd, 2013 AT 9:09 PM
Tiny
JDL
  • MECHANIC
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Just to add, low speed fans come on around 223 degrees F. The high speed around 230 degrees F.
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Wednesday, January 2nd, 2013 AT 9:15 PM

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