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Join Date: Jul 2013
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radiator fans keep on running

hi folks,

1989 944 s2

Both radiator fans keep on running when car is shut off. I have to remove the large double relay from the fuse panel when I park the car. Should I look at the temperature sensor on the radiator or the relay? Is there any way to test the sensor and the relay?

thanks,

Old 07-27-2013, 11:51 AM
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It sounds like the temp. sensor. Try wiggling the wires, maybe they are making a poor connection, or making a bad connection with something. But odds are the sensor is bad, not a hard replacement, and the sensor is pretty cheap
Old 07-27-2013, 12:37 PM
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The last time my fans kept running long after my car was shut off, it was the temp sensor on the radiator. Make sure the temp sensor you replace it with matches the temp on the thermostat.
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Old 07-27-2013, 12:58 PM
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Yep, temperature sensor. I had the same problem, and it stopped as soon as I replaced the sensor in the radiator.

I also replaced the relay while I was at it...they're getting old and most aren't very expensive, so why not? (I think yours may be a lot more than the one for my 924S, though...so probably want to try the temp sensor first.)
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Currently have: Guards Red 1987 924S 16v -- Light Blue Metallic 1980 928
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Old 07-27-2013, 02:29 PM
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thanks for the info. I disconnected the plug on the temp sensor and they shut off. Does that mean that the sensor is bad? How can I tell what temp thermostat i have without taking it out?
Old 07-27-2013, 02:31 PM
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Actually I think I replaced what they call the "auxiliary fan switch", which appears to be a different part than the sensor.

This:
Pelican Parts - Product Information: 951-606-481-00-75-M2

There's also a different temperature version:

Product Information: 951-606-481-00-85-M2
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Currently have: Guards Red 1987 924S 16v -- Light Blue Metallic 1980 928
Gone: Minerva Blue 1979 928 -- Gray 1985.5 944 -- Black 1989 944 -- Black 1984 944 -- Black 1987 944S -- Alaska Blue 1974 914 1.8 -- Guards Red 1983 944 -- Guards Red 1987 924S -- White 1988 924S -- Maraschino Red 1987 944 Turbo -- Beige 1981 924 -- Red 1984 944
Old 07-27-2013, 02:34 PM
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Yes, you are correct. The sensor sends the temp to the gauge. How will I know which is the correct switch temp to purchase?
Old 07-27-2013, 03:27 PM
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I'm not sure...I think I got the higher one for my car but I don't know and I didn't know why they had two different ones.
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Currently have: Guards Red 1987 924S 16v -- Light Blue Metallic 1980 928
Gone: Minerva Blue 1979 928 -- Gray 1985.5 944 -- Black 1989 944 -- Black 1984 944 -- Black 1987 944S -- Alaska Blue 1974 914 1.8 -- Guards Red 1983 944 -- Guards Red 1987 924S -- White 1988 924S -- Maraschino Red 1987 944 Turbo -- Beige 1981 924 -- Red 1984 944
Old 07-27-2013, 03:36 PM
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When the fans run all the time, or never come on, it's the fan switch on the radiator. If you want the fans to come on at a lower temp, buy that one.
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Old 07-28-2013, 09:13 AM
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If you search, a few members have said it is possible to change the fan switch without draining the radiator. Just be quick and have the new one ready to install in your other hand. You may only loose a cup of coolant.

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Old 07-28-2013, 10:05 AM
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Yes, I didn't lose much coolant when I changed mine. On mine it's at the top, right beneath the upper main radiator hose.

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Currently have: Guards Red 1987 924S 16v -- Light Blue Metallic 1980 928
Gone: Minerva Blue 1979 928 -- Gray 1985.5 944 -- Black 1989 944 -- Black 1984 944 -- Black 1987 944S -- Alaska Blue 1974 914 1.8 -- Guards Red 1983 944 -- Guards Red 1987 924S -- White 1988 924S -- Maraschino Red 1987 944 Turbo -- Beige 1981 924 -- Red 1984 944
Old 07-28-2013, 02:35 PM
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