My sis has a 91 Z-28. My dad noticed that only on fan was on when the car was at operating temp. Are both fans supposed to be on, or does the other one come on at a higher temp? Also, He said that when he put the AC on, and gave it some gas, that the otehr fan went on for a few seconds, then went back off. Do you think the fan motor needs to be replaced? Thanks

 

somebody has to know this. Any ideas?

 

sounds normal.

James

 

Its normal,They are set to two different temps.

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One fan is supposed to come on when the engine reaches a certain temp, like 239*, which is very hot... the secondary fan will come on when the A/C is turned on (or defrost). It is controlled by a pressure switch, so the switch could be bad, or if the A/C needs servicing (low pressure), it could cause the fan to not come on and stay on while the A/C is in use. Once you shut the A/C off, the secondary fan will continue to run for a couple of minutes. Most people have replaced their stock fan switch with another one that comes on at a lower temp. Mine is a 200* on, 185* off...

KAM