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
  • 8,836 Answers

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:

cooling fan kicks on when start of vehicle, the - jturcotte_124.gif


3.4 liter engine:

jturcotte_125.gif

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

jturcotte_15.jpg

Posted on Nov 08, 2010

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Posted on Jan 02, 2017

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1 Answer

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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Do you know how to test a computer controlled relay ? Go to you tube an search relay testing . Does the temp. gauge work correctly ? I know you probably don't have a factory scan tool , but this is the where I would start , checking temp. sensor input to the PCM . An with a factory scan tool I can do bidirectional testing , see if I could turn the fans on will scan tool .

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Hi: I read your answer to the problem with the 1999 Mercury Mistique temperature gauge. I'm having a similar problem. My temperature gauge is broken in the cold position. And, as far as I can tell,...


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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You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
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Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

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if i disconect temp sensor fans come on cool engine but then no temp gauge

That's what I'd expect after unplugging.
This is sounding like a bad coolant temp sensor. Test it or replace it before you do anything else. Read this post on how to test an engine coolant temperature sensor

Test engine coolant temperature sensor Ricks Free Auto Repair Advice

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problam could be with your coling temperatuer sensor .make sure fuse for you raditor fan is good.and you have coolant in you raditor.

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