Question about 1995 Buick Century

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The fan on my 1995 Buick Century won't stop until I unplug it. Help!

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  • mathfan929 Jun 18, 2009

    Thanks, that was a great detailed answer like I did. But, my fault, wrong fan. Sorry about the mix-up, I meant the cooling or radiator fan. Can you help me with that?

  • mathfan929 Jun 18, 2009

    Thank you so much! The detail of your answer is great and easy for me to understand (well, I'm a female, you know!). I really appreciate your help.



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  • Master
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There is a realay located on the radiator that makes the fan come on. Locate it by the front passenger corner of the hood. Then I would find the temperature sensors that control the fan (usually one for switching on temp, and another for shutting off temp).
Replacement of one or both of these will solve the problem. There is a test procedure for these. Pull these relays attach a meter to the terminals and measure resitance. Place them in a pan with hot water and see if your reading change. If they do not it is bad. Good Luck

Posted on Jun 18, 2009

  • Roger Campbell
    Roger Campbell Jun 18, 2009

    There is generally a thermal sensor switch located on the radiator, most often near the bottom, (but it may be in one of the water galleries on your machine) this usually operates in the region of 85 degs C, this then normally would operate the fan relay which in turn operates the electric fan.

    Here are some numbers for you.


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  • Buick Master
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The cause of this problem is the blower speed control resistor is shorted, it is very common, there is a GM service repair bulletin on it. to replace the blower speed regulator resistor go the firewall in the engine compartment, the speed controller has a four wire connector to it, it is held into the air ducting of the system by two machine screws.
here is a Photo and part number with price.

ACDELCO Part # 1580844

The fan on my 1995 Buick Century won't stop - 78031c3.jpg

Posted on Jun 17, 2009


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1995 Buick Century 3.1 Cooling fans not running. I have replaced the cooling temp sensor and the ECM the fans and relays are all working i have jumped out relays and both fans run. Check the coil of the...

You have done well so far, but this is a hard problem. Have you checked the reference voltage (usually 5vdc) that is going to the temp sensor? It might be getting pulled down by one of the other sensors on that wire. A way to check is to get a baseline voltage on the coolant temp sensor black wire. Then unpulg the map sensor--does the voltage on the black wire increase? If yes, replace the map sensor. If not, next unplug the A/C pressure sensor. Same process. Finally, unplug the transmission temp sensor. If unplugging any of these sensors increases the voltage on the black wire by say a volt, replace the bad sensor and retest.


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the best method is one at a time.pull the wire by the boot and remove.then remove other end in same fashion. measure the length of the old wire the the replacement and install making sure that the boots are well seated, you will normally hear a click or feel the boot seat.continue in this fashion until all wires are replaced,then proceed to change plugs one by one making sure that the air gap is to specifications.
do not overtighten plugs ,snug is fine.

Nov 21, 2011 | 1995 Buick Century

1 Answer

When my buick century 1995 is cold it will start but won't rev up. once it is hot it runs okay

Number of possibilities. See if you have any diagnostic codes stored. Could be throttle position sensor, coolant temp. sensor, hard to say. I would start with the codes. Does it start easy when warmed up, and run good? Boy, I just don't know.

Oct 30, 2011 | 1995 Buick Century

1 Answer

Where is the radiator fan relay located in the 1995 buick century special

In the main fuse box under the hood.Its approx 1"x1" black square, the legend of the relays is on the backside of the lid.Let me know if this helps

Jan 20, 2011 | 1995 Buick Century

1 Answer

Fans not working when buick century 99 engine heats up

i have a 99 buick cenrty first off the car drives fine down the road at its normal temp if you sit at a redlight to long it goes up and will not come back down untill you get going down the road. second i noticed that the fans are not coming on when the temp rises. is there anyone that can help me out on this?

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My 1995 buick century 4 door v6 3.1 is over

You need to change the "Coolant Temperature Sensor". That usually controls the fan. If the fan does not run, you will overheat.

Jul 28, 2010 | 1995 Buick Century

1 Answer

I have a 1995 buick century.the fan only works on high and it will not switch from defrost to it an electrical switch or is it something else.

there is an electrick switch moter located on the heter box it is very hard to fix rely on certified help

May 02, 2010 | 1995 Buick Century

1 Answer

My Buick Century with a 2.5L is stalling at lights and stop signs. when restarted and put in drive it stalls and won't stay running? Any help?

The TCC solenoid in the transmission needs to be replaced. This is a common problem that requires removal of the side cover of the transmission. You can unplug the wires at the front of the transmission and drive it until you get it fixed but you will not have over- drive lock- up convertor. This will result a drop in fuel mileage,

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