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1996 Pontiac Sunfire coolant fan not cycling on it's own

Tiny
DELAMORTE
  • MEMBER
  • 1996 PONTIAC SUNFIRE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I have replaced the coolant temperature sensor, relay, and fuses. The fan is not responding to the temperature sensor. The fan will work when defrost or a/c is engaged. Vehicle has no coolant leaks. Just replaced the water pump and pressure test shows no sign of issues. Mitchell points to new pcm. Anything else I can try before I resort to buying a pre-flashed computer?
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Tuesday, June 2nd, 2009 AT 8:01 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sounds like PCM is not picking up the CTS signal and not activating the relay to fire up the electrci fan motor
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Tuesday, June 2nd, 2009 AT 8:04 PM
Tiny
DELAMORTE
  • MEMBER
  • 2 POSTS
Using a Solus I can read the coolant temperature sensor.
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Tuesday, June 2nd, 2009 AT 8:07 PM

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