Hey guys

Our 1996 Lumina will not work on the highest fan speed setting. We got another control unit to see if it would fix it and it didn't—so we were suspecting the resistor block.

Any ideas on what it could be? We tested the resistor block with a voltmeter and everything seemed to check out.

Thanks,
Elliott

 

Have you tested the fan moter itself? There could be a problem in the windings.

 

No nevermind. It was the high speed fan relay.