924Board.org

UnderDog · Joined: 27 May 2010 Posts: 23 Location: Westbrook, CT

Car running hot at idle, or when driving slow. Seems to cool down on the highway, but on hot days its still near the red even at highway speeds.

Q's - are there two fans or one? I hear one fan turn on when the temp needle just touches the red. No fans run when car is shut off. I thought there were two fans, so is this a bad relay? Also, seems I have ground issues or weak battery as just altering electrical draw like turning on lights will alter the temp gauge reading a bit. But I still suspect its really hot and the reading is close, something else not right.
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UnderDog
'88 924s

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Clark's Garage. . .fan operation and troubleshooting.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

UnderDog · Joined: 27 May 2010 Posts: 23 Location: Westbrook, CT

Thanks for the clarks link. So this is for a 944, I thought I understood the similarities. They describe the 85.5 and older, and I think thats the guide I need to look at even thought I've got an '88. I see that newer 944's have a 3 wire thermo sensor, I looked and from what I saw its a 2 wire, so it looks like the 85.5 and older w/ AC is the guide I want.

Will see what I find this weekend. Thanks.
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UnderDog
'88 924s

masterdave · Joined: 10 Dec 2008 Posts: 183 Location: Harrison NY

check the grounds, if you just got the car clean them, that solved alot of issue for me. I had a similar problem, changing the thermostat helps alot. also remember that the car will always heat up a bit at slow speeds and idle due to a lack of air flow, its not that the fans dont move the air but the hot air builds up under the hood and the still air under the car gets hot, but its a small price to be payed for the increased performance of allowing sports car engines to run that hot.