Question about 2000 Buick Regal

2 Answers

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?

Posted by on

  • 2 more comments 
  • 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?



2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 104 Answers

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.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What turns on the cooling fan on 1999 buick regal?

the tempeture sensor either water tempeture or a/c

Jul 20, 2012 | 1999 Buick Regal

2 Answers

Cooling fans do not come on at all just changed the coolant temp sensor and no change should i change the thermostat also?

I would check for voltage and ground at the fan.Even with a thermostat stuck open you will build up enough heat sitting still to turn fans on. they should come on when the ac is on.Try swapping fan relay with something else and see if they work.

Jan 11, 2011 | 2000 Buick Regal

2 Answers

Code problem p0481 buick regal 3.8L V6

That fault indicates a problem in the electronic cooling fan circuit. More specificly the output driver in the onboard computer has detected a problem with the control circuit of the electronic fans. First inspect for correct operation of both radiator mounted fans.

Mar 12, 2010 | 2002 Buick Regal

1 Answer

Overheating car will shut off after 20 min will run again

maybe replacing the thermostatic fan switch would fix it.

Sep 23, 2009 | 1999 Buick Regal

1 Answer

Both cooling fans will not come on

Did you try jumping the cooling fans with direct power to see if they worked and the fan motor isnt burned out?You can turn the a/c on while running the car and it should turn the fans on even if the car isnt heated up.

Mar 29, 2009 | 1996 Buick Regal Olympic Gold

4 Answers

Fans run constantly

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..

Feb 15, 2009 | 2001 Buick Regal

1 Answer

Air Conditioning isn't cooling

You will have to take it into your nearest a/c specailist as it sound like your A/C canister needs refilling.

Jan 11, 2009 | 2000 Buick Regal

1 Answer

Cooling fans will not run

Most GMs use a relay package to turn on the fans. That is often controlled through a processor package. Very complicated...if yours is one of them. You will need Mitchell's manual or equal to trace this to see if you have all the signals.

Jun 19, 2008 | 1995 Buick Regal

Not finding what you are looking for?
2000 Buick Regal Logo

386 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

78267 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides