Question about 1989 Cadillac Seville

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Cooling fan fault on 1989 Cadillac Seville

The cooling fan is not working on my 1989 Cadillac Seville. I have tested the fan motor by connecting it directly to the battery and it works. When I connect a voltmeter to the wires going directly into the fan I see 12 volts if the plug is not connected to the fan. If I plug in the connector the ground wire appears to not be connected to ground. The positive wire still shows 12 colts when compared to a chassis ground. I think it is a bad sensor. How many sensors are there that could cause the problem and where are they located?


Thank You
Bob

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  • bobnovato Mar 12, 2009

    It appears that the fan is controlled by the ground wire. The positive (hot) wire is switched on when the ignition is turned on. It stays hot all the time the ignition is on. I ran a separate ground wire to the fan and the fan turned on and stayed on (motor running or not). Also even with the separate ground wire to the fan the message "cooling fan fault" still appeared in the message center. Where are the sensors (I think there is more than one) located ?

    Bob



  • bilcast Mar 18, 2009

    Same issue. I changed the temp sensor but still have the problem. Coolant fan works with climate control ON. Possible isue with fan control module?

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I discovered it was the fan control module. I found it on the internet for 150.00 plus 100 core. I googled the part # and thats how i found the company. My local cadillac dealer quoted me 402.

Posted on Apr 13, 2009

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Replace coolant fan module. Its underneath the hood lock. It fixed mine. Be sure to hook up the fans correctly because you can get them mixed up. Never wire the fans up where they will run all of the time. The car will use more fuel and it will not heat up quickly, this will damage oxygen sensor. Also the ac will not work right as all of this is controlled through the BCM.

Posted on Apr 07, 2009

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Well, you could have a bad ground.  But as far as sensors go, there is the temperature sensor, which tells your computer to kick the cooling fan on.  I would look down below the fan and follow the ground.  I have seen cars that have oil and chemicals that coroded the ground.  Take the ground wire off and clean it.  Put it back on.  IF that does not solve your issues, then I would start looking at the temp sensor.

Posted on Mar 12, 2009

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