Question about 2002 Pontiac Montana
When ignition is turned off fans stop, when relays are removed fans turn off. Could problem PCM fan drivers?
Could be that you have 2 Thermal sensors as some cars have one for the dash gauge or light and the other is for the PCM.
Remember that when you turn on the A/C it can trigger the cooling fans to run continuously. If the A/C is left on while you are doing all of this, it can be a simple reason for the problem.
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Posted on Jan 03, 2013
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Posted on Jan 02, 2017
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.
Posted on Aug 22, 2008
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
Posted on Feb 04, 2009
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