Technical Tips > Post 84

C4 Engine Cooling Fan

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sirfixalot:
Does any one know if when a C4 starts up when cold should the cooling fan run. It is driven via a relay from the Powertrain Control Module. The Powertrain Module has an input from Coolant Temp Sensor which I assume drives the fan via the Control Module. The Temp Sensor reads 71.5 ohms when cold.

87Z51:
If the A/c is turned on fan will run any time regardless of engine temp.
If A/c is off and fan runs ; key on; is generally a indication of a PCM fault and the PCM is in limp home mode

sirfixalot:
Any one else got any ideas on this problem. I assume I am looking at the correct sensor.  Sensor is located on R/hand side of motor at the front.

gtc:

--- Quote from: sirfixalot link=topic=7392.msg1045936451#msg1045936451 --- I assume I am looking at the correct sensor.  Sensor is located on R/hand side of motor at the front.
--- End quote ---


Dunno what year model you're working on, but some posts in this thread about an '86 might help:

http://forums.corvetteforum.com/c4-tech-performance/761685-second-cooling-fan-infront-of-radiator.html

sirfixalot:
Car is an 86

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