Question about 2000 Buick Regal

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Cooling fans do not shut off automatically

I have a 2000 Buick Regal, the cooling fans run at all times even when the car is cold. I tried looking for a sensor to replace but could not find it. Any suggestions?

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  • LMedina19853 Jan 04, 2009

    The engine is a 3.8 (3800 Series II). It is not supercharged.



    Thanks for your quick response!

  • LMedina19853 Jan 04, 2009

    Thanks for your advise, just one more question...

    Does the Check Engine Light come on when the coolant sensor doesn't work?



    Again, Thanks!

  • monisia2 Mar 05, 2009

    I have a 2000 Buick Regal,not supercharged the cooling fans run at all times even when
    the car is cold. I replaced a sensor twice already but after couple days of driving problem will come back,and again when we connect the computer the scan result is the same showing "temperature sensor under the thermostat" .I spent couple hundreds already and no results.Any suggestions?Please help

  • Scotty
    Scotty May 11, 2010

    Which engine do you have in this vehicle? Is it the 3800 Series II. Also is it the supercharged engine or non-supercharged?

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My 2000 Buick regal had fans running all the time and sensor was good. Replaced thermostat and rubber gromet with OEM parts. Parts from local parts stores (went to 2) didn't fit correctly! Problem fixed. Had outside temp sensor go out shortly after but replaced with aftermarket parts and everything is good.

Posted on Feb 28, 2010

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The coolant temperature sensor is nearly single handedly responsible for turning on the fans. It should be a three wire sensor. One wire goes to the dash to provide temperature information on your dash, one wire provides a signal to the PCM for coolant temperature information and the third wire is the ground or low reference wire.

If you open the hood, look to the right side of the engine bay, just to the right of the upper motor mount and just to the left of the air filter box, you will see the upper radiator hose. Trace that hose to the engine and that end is connected to the thermostat housing.

If you look just below there on the lower intake manifold, you should see a brass looking device with a connector on it. That is your coolant temperature sensor.

Now, if you plan on replacing this yourself, buy the new sensor. Look on the threads, if it has a red coating on the threads, then it already has thread sealant on it. However, if you want to put on some teflon tape, it wont hurt anything.

Disconnect the electrical connector and use a wrench to loosen and remove the old sensor. Now have the new sensor within reach. Once the old sensor starts to come completely out, pull it out with one hand, use a finger on the other hand to plug the hole.

Then grab the new sensor, put it in the hole that you have plugged with your finger as quickly as you can. If you do it this way, you'll not loose very much coolant at all and probably wont have to bleed any air out of the system.

Hope this helps out.

Posted on Jan 04, 2009

  • Scotty
    Scotty Jan 04, 2009

    Not always. The only time Im aware of that it would trigger a check engine light is if the coolant sensor reported too cold of a coolant. If the computer perceives, by way of a faulty signal from the coolant sensor, that the engine did not warm up to a certain temperature in a certain time, then it would trigger the check engine light.

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