1995 Pontiac Bonneville Logo
Anonymous
Anonymous Posted on Jan 19, 2018
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I just replaced the thermostat and coolant temperature sensor. Now the cooling fans are not working and the car is over heating..way past 250 deg F. I checked the relays and fuse and fan motor. All appear to be okay. Is there another sensor for the fans? Any idea why fans are not functioning.

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jack layton

jack layton

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  • Pontiac Master 5,569 Answers
  • Posted on Jan 19, 2018
jack layton
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Did you check for voltage at the fuses with key on? Use a test light, two fuses. Hope you can read diagram? trying to get everything I could in one diagram, a little small. Some makes and models, if you unplug coolant temp sensor, the fans will run all the time, it's a default feature. Not sure about your vehicle, you can try it?
I just replaced the thermostat and coolant - fans-sf4p5yh4futzvtdbwismixqh-3-0.jpg

5 Related Answers

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Aug 22, 2008

SOURCE: cooling fan not working

The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.

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Anonymous

  • 74 Answers
  • Posted on Aug 26, 2008

SOURCE: 2004 pontiac aztek cooling fans not working

relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

Ronnie Wilson

  • 1596 Answers
  • Posted on Feb 04, 2009

SOURCE: 95 grand am radiator fan only runs with AC on

Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment.
I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson

Anonymous

  • 25 Answers
  • Posted on Mar 22, 2009

SOURCE: location coolant temperature sensor 4.2 liter envoy ?

COOLANT TEMP SENSOR IS MOST LIKELY BAD. NEED TO CONNECT TO THE OBD CONNECTOR WITH A COMPUTER AND SEE WHAT TEMP THE COMPUTER IS SEEING.

Anonymous

  • 11896 Answers
  • Posted on May 04, 2009

SOURCE: 2000 pontiac montana cooling fans

YES you will need to replace the sensor.

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