924Board.org

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

Any one else have an fm intercooler and have problems running hot/ overheating. I am wondering it there is not enough air flow to radiator? I can’t figure out why my car is still running hot all the time. I got a new pump, flushed radiator many times, ran with flush in water for 20 min. of driving, flushed up hose into block and everything is clean. I also put a lower temp. fan sensor, so the fans come on second mark now. But after all that it still runs on third line and even up into red? Tried running straight distilled water, 50/50 mix and 50/60 mix antifreeze all will still run hot? If I am running a bit rich could that make it run hot? Any one have any ideas ? Thanks Heath

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

Have you checked the temperature sensor and the wiring from the sensor to the gauge?
_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

That it a good idea, where is it? Whats ther best way to test it? I am not really sure i trust the gauge because it will flop around once in a while? is this normal? Is this gauge still available i would just like to replace it, i dont like how it flops around.

Smoothie · Posted: Sun Jul 03, 2005 3:51 am Post subject:

It's most likely a wiring and ground problem if the reading flops around. I wouldn't assume a gauge problem at this point.

Another possible cause of overheating is having the wrong style of thermostat installed. Make sure you have the correct one for the 924 - with the disk at bottom. Without this, coolant flow through the radiator would be lessened greatly.
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

ok i will check the thermostat and see

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

pull out the Haynes for the info on the "Coolant Temperature Sensor". Unfortunately Haynes does a too-hard on testing the sensor and suggests that you test it by putting a new one in and seeing if that fixes it.

The 924 cooling is a bit marginal so it could be that with your intercooler there isn't enough cool air getting to radiator, especially if you're running a standard radiator.

Perhaps someone with a factory workshop manual can provide the resistance of the sensor at various temperatures so you can pull it, put it in a pot of water and measure the resistance as you heat it up.

It may be that you need to upgrade to an aluminium radiator.
_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

Ok I just pulled the thermostat and it looks to be the right one, has disc at bottom. Says 54mmon it. I tested it in a pan and it starts to open a 190 and is fully open at 197. Doesn’t this sound a little high? Is it ok to run without a thermostat in the summer, seems like it will get a better flow that way?

Smoothie · Posted: Mon Jul 04, 2005 2:06 pm Post subject:

No. You need the thermostat. Look at the Haynes coolant flow diagram to see why - fig. 2.2, pg 59.
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

numbbers · Posted: Tue Jul 05, 2005 10:10 am Post subject:

190 degree is the factory standard, but it is too high for these cars. Get a 180, or even a 160 if you can find it.
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1980 924 Turbo

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

I've got a 180°f thermostat and a lower temp switch in the radiator but what did the most good was cleaning all the connections under the dash where the ground wires connect behind the speedo on the steel grounding crown of the body. I rarely get above the first line and haven't touched the center line since I cleaned all the grounds. Clean every ground wire you can find and see if that helps.
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'80 924 n/a SOLD

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

ok i really dont know what is going on with this car, i got a 180 deg. thermostat now, along with a lower temp. fan switch, i flushed radiator many times, is really clean. Also put new pump on and yet i am still getting too hot?? All that is left to replace in the cooling system is the radiator?? I have cleaned all the grounds before, but it has been a while, so i will try that as a lost resort. I am about ready to just go get a aluminum radiator or something, this is crazy i cant even drive anywhere without it geting hot?? i dont know what is goin on?

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

At the same time I replaced the thermostat, I did have the radiator professionaly cleaned and inspected. If someone put some stop leak in there in the past, that would certainly be a problem. Or it may just needs a good cleaning. Maybe pull it and take it to the rad. shop?
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'80 924 n/a SOLD

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

I would be suspect of the wiring, especially when you say it jumps around at times. Mine was doing the same thing for a while- would read in the red at times, although it was actually just fine, and sometimes it would flicker. I chased the wires down and ran new ones, afterward the needle sat on the first mark just like it was supposed to...

Definitely check it out before having the rad rodded out, or replacing.

nick

D Hook · Joined: 02 Nov 2002 Posts: 3158 Location: Omaha, NE

Nick,

Good solution. It's always the bouncing gauges that make the connection suspect. Same goes for the fuel gauge. I cleaned all the connections at the gauge and at the sender and now it behaves as it should. And after the cleaning behind the dash, my oil pressure gauge no longer drops significantly when the headlights are turned on.
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'80 924 n/a SOLD

mustangporsche · Joined: 08 Oct 2003 Posts: 283 Location: California Lodi

Well i think i might have got lucky, i think my connections were just dirty, the ones on the back of the block, for the temp. sensor. Wow are those a lot of fun to get to and clean. But now i think i am ok, so it was either that of the gauge itself, or dirty connections,. I finaly got around to swaping all my gauges to get rid of that crazy 85MPH speedometer. So i think i got it, i will take it out for a drive tomarrow when its hot to really see. Thanks guys for the help, this form is really great