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One of my fans on my 1990 Vette is not coming on. Only the one on the left comes on when I turn the air conditioner on. Can anyone tell me how to check the relays or fan for the problem?
Jumper ALDL pins S&B (upper right) and start the engine. I believe this should bring on both fans.
If not locate the relays and the control wires into each. Then jumper the control wire go ground with the ignition On. This should bring on the respective fan. If not, suspect the relay, wiring or the fan motor.
I've been through this with my 90. I wrote a tech tip on it. They squeezed it all together after I submitted it so it appears horribly written, but the info is still there.