1989 Buick Regal electric fan not working?

BBOB1

MEMBER
1989 BUICK REGAL
4 CYL
FWD
AUTOMATIC
30,000 MILES

When the ac is on, should the fan come on, when I am stopped at a light, the ac air turns from cold to hot until I am up to speed then it gets cold again, shouldnt the fan turn on when I am stopped, or when the ac is on, I am not sure the fan works at all, I ran the car 20 minutes with the ac on and the fan never came on

3 Replies

JDL

MECHANIC
16,098 POSTS

Hello, are you talking about the radiator fan? My wiring info is limited on your model year. I do know on some older GM vehicles, yes, the radiator fan comes on with the ac. Also, If you use a jumper between the A & B terminals, like your checking the codes, again the fan will run. If you unplug the cts, then turn the key on, the fan may run.

Do you have more than one fan? Any codes? You could take the connector loose from the radiator fan, use jumpers from the battery posts for B+ and ground, just to see if the fan will run. Use an inline fuse on the jumper.

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Tuesday, July 21st, 2009 AT 2:36 PM

BBOB1

MEMBER
2 POSTS

What is a cts, is that that the thermostat sensor? You mean unhook that?What do you mean by use a jumper between the a and b terminals? Of what? Is that like checking codes, are you talking about using a paper clip to jump a and b to get the codes. I dont have a manual

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Tuesday, July 21st, 2009 AT 5:26 PM

JDL

MECHANIC
16,098 POSTS

CTS is coolant temp sensor, yes, unplug it, turn on the key.

The A & B terminals of the datalink connector, like checking codes.

You could take the wiring connector loose from the fan, run jumper wires from battery positive and battery negative to the fan connector, to see if the fan will run, use an inline fuse on the jumper. The solid black wire should be ground, the other voltage.

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Wednesday, July 22nd, 2009 AT 7:51 AM