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Radiator Fan Runs on its Own
#1

I was in my garage yesterday working on the 944V8 track project. Parked next to the 944 is my 968. The 968 doesn't get out much. I've had it 5 or 6 years and have only logged 3,000 miles or so. It has been over a week since I have driven the car, had a key in it, sat in it, touched it etc. Out of nowhere, the radiator fan cycled on and off. About an hour later it did it again. I suspect a bad radiator thermo switch or even a bad relay. Any other ideas? (beside needing to drive the car more [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img] )
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#2

I would guess the thermo-switch as well.
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#3

I would try the cooling fan realy from your 944. Should only take a minute.
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#4



That ship has sailed...
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#5

Well, I found the 944 fan relay in a box (I don't remember saving it, but I did). Connected the battery with the old 968 relay and the fan started to run again. Switched to the 944 relay (same PN) and the fan stopped. I heat cycled the engine to verify that the 944 fan relay worked as intended and the 944 relay performed well.

Here's the tally: 1) one dead battery upon delivery of the car 6+ years ago, 2) one dead Sears battery 4 years ago, 3) one dead Interstate 3 years ago, 4) one dead Red Top 2 months ago, 5) two themo switches over the past 6+ years, 6) spending an entire Saturday cleaning grounding points (I did this a few years ago), 7) meeting a AAA Club driver several times...

Based upon my experience, I would suggest grabbing a spare Fan Relay if you ever have the chance. It may help in diagnosing a dead battery, cooling issues, etc.

Another member here purchased a fairly low mileage '94 that had a new fan relay already installed in the car. My car has around 31,000 miles, so you can't judge the condition of a fan relay by mileage alone.



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