Quote:
Originally Posted by krl
Is there any way to validate proper operation of the second fan while car is sitting in the driveway?
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I think you were pretty close with what you've done already.
If you go out for a drive on a hot day, go for a nice brisk drive and get it up to temperature. After about 30 minutes, come home and park it in your driveway and leave it idling. Turn off the air conditioning.
At this point, you shouldn't hear any fan running. As the car heats up since it isn't moving, the second fan should kick on (depending on ambient temperature, I would guess 10 minutes or so). Once it does, turn on the AC and then both fans should be going.