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Deborahheinz

Cooling Fan

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I have a friend and FMCA member with 1990 Chevy 454 on a P30 chassis having a problem with the cooling fan. The fan is running constantly and he thinks the sensor is faulty. Can anyone provide a diagram showing the location of the sensor? Thank you.

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There will be two different fans:

Engine driven fan which has a viscous hub clutch and an electric fan(s) in front of the condenser.

The electric fan(s) are activated by the dash A/C and may be activated by a separate temperature sensor as well-- I have not worked on that particular model.

Hopefully, someone with that model can give specifics on the electric fan circuitry.

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