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
  • 986 Answers

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
RESISTOR,BLO MOT HTR & A/C $40.00

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

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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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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1995 BUICK CENTURY SPARK PLUG WIRE REPLACMENT


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1 Answer

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