Question about Pontiac Grand Am

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I have a 95 Gran AM GT with 3.1 auto. The motor will run until it gets overheated and boils over, but the fan will not start.I have totally flushed the system,pulled and inspected the water pump, changed the upper rad hose, bottom hose is as new. Changed the thermostat twice, now with a 180 which I checked before I installed. I have changed the coolant temp sensor (on the housing between the engine and the thermostat) twice.I have checked the sensor for the temp gauge by temporarily grounding out to the block and it sends the temp gauge up to max temp. If I run the AC the fan will start, as it should, and the engine will operate at normal temp. If I shut off the AC the fan will quit, and the engine will continue to get hotter until it boils over but the fan will not start. If I disconnect the wires from the coolant temp sensor the fan will start and continue to run until I shut off the key,then it will quit. If I restart the car the fan will not restart untill I reconnect the wires then pull them off again. What could possibly be my problem?

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Fan operates when coolant temp reaches 226 deg.F and shuts off at 219eg.F
fan is controlled by the PCM infuts from Eng. coolent temp. sensor & Intake air temp. sensor
the yellow wire is the 5V reference and the black wire the is the PCM ground sensor
make sure your not using teflon tape on the threads of the temp sensor.
it sounds like the PCM wont turn it on. check the harness for continuity between temp. sensor and PCM harness
clear connecter - pin 17 black, pin 31 yellow

Posted on Sep 12, 2010

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