Question about 2001 Pontiac Grand Am SE

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Cooling fan kicks on when start of vehicle, the temperature gauge wont read a temp, just stays at "cool". fans shut off when car is turn off.

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  • Pontiac Master
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PCM is probably not getting a signal from the temp sensor, so it's kicking the fans on just in case. Check connector on sensor. If connector is OK, replace sensor. The sensor is mounted on the thermostat housing near the end of the upper radiator hose. See picks of a couple engine examples below. The part is only $11 at autozone.com, and a pic is pasted below. Let me know if you have any questions.


2.4 liter engine:

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3.4 liter engine:

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ccooling fan kicks on when start of vehicle, the - jturcotte_15.jpgor:

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Posted on Nov 08, 2010

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I have a 2002 Lincoln town car and I just put a brand new fan in and its not coming on my car runs hot when I have it in park with the ac on


Did you check the fan relays ? There are two, cooling low relay an cooling fan high relay . The relays are turned on by the vehicles PCM - engine computer , when an input from the coolant temp. sensor indicates a certain temperature ! When you turn on your A/C the cooling fan should turn on an stay on .
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{: ) You didn't mention the model of your vehicle. Anyway, I admire your way of observation, and I'm sure you got the analogy by now. When the car is running, the engine rpm is higher, and so with the water pump, plus the wind velocity passing thru the radiator fins, can give sufficient engine cooling without the electric cooling fans. But when your vehicle stops, like sitting on a traffic, the engine rpm is lower, and so with the water pump, and there ain't enough wind to help.
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Very correct the ECT is a 2 wire thermistor,when coolant temp increases, the resistance andsignal voltage decrease,If you disconnect the sensor the fan goes on, you just trouble shooted the vehicle cooling fan switch, If anything the signal to the gauge itself may be non-op and not getting to the indicator, try this with vehicle at warm up temperature if you turn the A/C does the fan turn on.it should if it doesnt the power juction box (fuse and relay in engine compartment should be checked, for any opeen fuses, By the way the guage information is from the PCM

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Thermostat and Coolant Temp Sensor is What I Recomend Replacing on this Vehicle

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