Mechanics

2 ELECTRIC COOLING FANS

1995 Buick Roadmaster

Electrical problem
1995 Buick Roadmaster V8 Two Wheel Drive Automatic 140000 miles

primary fan comes on with ac on. Secondary fan not coming on at all. Relays and fuses are good. Tempurture switch replaced. Could the ecm be bad? THANKS!
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Walt sarkozy
July 9, 2010.



The fan's motor is more likely to be bad then the computer, test the motor by supplying 12v direct power to it.

Yes both motors work when connected to the 12 volts. Its strange that the the primary fan comes on only when the ac is on. The secondary fan is supposed to do that but the secondary fan is not coming on at all. Thanks!

Tiny
Walt sarkozy
Jul 10, 2010.