Question about 2001 Buick Regal

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Fans run constantly

2001 buick regal ls. cooling fans run constantly, doesnt let car warm up much in cold weather, service engine soon light stays on. replaced thermostat sensor, but problem still there. what could be causing this?

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  • dds_57 Feb 15, 2009

    it was the thermostat sensor that was changed, didnt change thermostat itself

  • Jeremy May 11, 2010

    Did you replace the thermostat sensor for the fan, or the thermostat that controls water flow to the radiator? The problem is probably with the latter, it sounds like it's stuck open.

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I had the exact same problem with my 95 regal custom after doing a head gasket it's a 3800 Under the throttle body there's a sensor I forgot to plug mine in and fans would always run with key to on position and SES light, it is not a coolant temp sensor it is directly under the throttle body if the sensor is bad or not connected you will have this problem might be worth a look

Posted on Oct 20, 2015

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Irwinr12 is right, no amount of fan will keep the Regal from warming up if the thermostat is working properly, Replace it. Clear SES light with OBDII tool & you should be good to go. BTY its the car computer that keeps the fans running, and they will continue to run until you clear the code. Any kind of cooling/overheating proiblem will kick in the SES light and set both fans running. I own '01 GS, my son has '03 GS and we have both complete set of service manuals. Trust me, do what I say. Batman

Posted on Mar 11, 2009

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The fan running constantly can't keep the engine from reaching the correct operating temperature if the thermostat itself is working properly. What's likely happening is the thermostat is stuck open, so luke warm water is running through the radiator and keeping the radiator fan engaged. Replace the thermostat and you'll probably fix your problem.

Posted on Feb 15, 2009

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Check for a loose connection, could be on the a/c side.. maybe someone pull a wire to change a battery or something check around..

Posted on Feb 15, 2009

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SECTION 303-03: Engine Cooling 2001 Lincoln LS Workshop Manual
DESCRIPTION AND OPERATION Engine Cooling The cooling system components include the:
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  • fan blade, fan motor and fan shroud assembly
  • radiator
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  • provides air separation during operation.
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The fan blade draws air through the radiator to help cool the engine coolant.
The fan motor:
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The engine coolant flows:
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A closed water thermostat returns the engine coolant to the water pump. An open water thermostat allows the engine coolant to flow to the radiator.
Unsatisfactory coolant materials:
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The cylinder head temperature sensor provides a signal to the temperature gauge.
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