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1997 Pontiac Grand Prix

Tiny
SHINE775
  • MEMBER
  • 1997 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Radiator cooling fans do not come on when I turn on a/c. They work fine on low speed when thermostat gets hot. I checked fuses, relays, and changed the fans, and high pressure switch. What tells the fans to turn on when the a/c is turned on?
Friday, January 1st, 2010 AT 5:14 PM

5 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
The AC switch on the dash tells the fans to run at a slower speed.
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Wednesday, January 6th, 2010 AT 6:47 AM
Tiny
SHINE775
  • MEMBER
  • 2 POSTS
Read my question again. The inside blower fan works fine. The radiator cooling fans are supposed to turn on automaticly when the a/c is turned on. They don't work.
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Tuesday, January 12th, 2010 AT 3:54 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Either the fan motor, relay, fan switch, or AC switch.

Test fan motor by disconnecting connector and apply 12V, if motor runs, then relay, fan switch, AC switch.

Disconnect fan switch, fans should run all the time.
If not relay.

Turn AC on and touch relay quickly, should feel a click, if not relay
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Wednesday, January 13th, 2010 AT 7:06 AM
Tiny
SHINE775
  • MEMBER
  • 2 POSTS
The fan motors work, and I changed the relays. The compressor also works. I'll try disconecting the fan switch. Can you tell me where the fan switch and a/c switches are located?
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+1
Wednesday, January 13th, 2010 AT 9:55 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
I'll see if I can find a schematic.
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Thursday, January 14th, 2010 AT 7:04 AM

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