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Porsche Crest HELP...Ive Got a Leak !

My 944 is leaking Coolant from somewhere. It only happens sometimes though. Its coming from the left side of the car (right if facing the car) In back of the coolant tank. Sometimes after I drive it I notice a small fist size puddle there and sometimes I dont. What hose(s) is underneath the tank but further back???

Also what brand coolant do you experts recommend for the 944 ?
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Old 08-03-2004, 03:36 PM
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shoot, i was gonna throw my hat in here, but you had to say 'experts'

The manual says anything that's phosphate free, though. Not 'aluminum safe', the bottle should say phosphate free on it.
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Old 08-03-2004, 03:48 PM
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It sounds like your cap is not holding the pressure and you need a new coolant tank cap - i had the exact same symptoms a few months ago. Make sure it is a proper OEM Porsche cap and not a Kragen/autozone generic cap. Have a look at your coolant tank next time it is overflowing and it should only be about half way full - i suspect yours is full to the brim and overflowing from the overflow pipe (little flexible rubber pipe from the coolant tank).

Or it could be air in the system that needs bleeding.
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Old 08-03-2004, 04:47 PM
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If the leak does not affect the temperture gauge, then make sure the cap is holding pressure. Also, if you have top up with more than 0.5L of coolant then bleeding the system is a must.
If the above doesn't work you can always pressurise the system to identify the leak.

Kenneth
Old 08-03-2004, 06:54 PM
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The Cap better be ok. When I bought the car in April I replaced the Stant (autozone) Generic cap and put on a new Behr OE cap.
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Old 08-05-2004, 08:26 AM
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I had the same trouble once. I flushed the system with a cleaner and refilled. It was ok in the end. I also used some decalcifier (the stuff they use in kettles etc) but I wouldn't suggest this coz you don't know what it will do to you engine?
I am also having the same trouble again now, as soon as I turn off the engine, a couple of minutes later water starts coming out of the overflow?
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Old 08-05-2004, 10:21 PM
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maybe the tank is too full when cold.
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Old 08-07-2004, 09:33 AM
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Can't recall instructions. Do the levels on the reservoir pertain to cold or hot coolant? I'm thinking hot.

Do you have proper mix of antifreeze and water in it?
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Old 08-07-2004, 01:47 PM
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I had a problem with the same symptoms..overflow after engine shutdown. The fan relay was not allowing the fan to run after engine shutdown, thus, heat soak, rising engine block/radiatior coolant temperature after shutdown blowing coolant back out through the plastic reservoir overflow tube. I did not try to repair the fan relay. After replacing the relay the overflow do not occur.
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Old 08-07-2004, 02:13 PM
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hmmm dont know the pressure. Only know its OE equipment. My fan only runs sometimes when I am done driving it, BUT not all the time when Im done.
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78 924 (first car) RIP
Old 08-07-2004, 04:22 PM
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The fan should not run all the time when your done - only if it is hot enough, so if it runs sometime it is probably ok - and then it only runs quietly once the engine is off.

Do you keep on (over?) filling it? - that would cause water to keep coming out? Only needs to be just above the min line when cold.

Have you had a look at the tank for 10 or 15 minutes after a drive when it had warmed fully up? just to check that the water is actually coming from the overflow pipe - if it is from the overflow pipe the tank will be full to the brim - if that is not the problem the water in the tank should only be up to the max line.

A bad case scenario is the head gasket is allowing exhaust fumes into the coolant - you can do a compression test (only $20-$30 for the gauge, and then you have a compression gauge whenever you need it!) or you can get some pH type stuff to test the coolant for exhaust gases (not tried this).

Good luck
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Lowered '84 944 no longer smokin!

Lowered, adjustable KONI shocks, APE chip, K&N panel filter, Strut tower brace, Blue Fuchs (+ anything else i've not discovered yet!)
http://photos.yahoo.com/shineyblue944
Old 08-07-2004, 10:56 PM
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Fixed my problem of water coming from expansion tank overflow when I turn off engine: I replaced the pressure cap.
Can anyone tell me please the correct rating for a pressure cap (PSI) on a 924?
Cheers
Misty
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Old 08-08-2004, 10:29 PM
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Ok I found it it is a 150 cap.
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87 944
72 914 Sold
84 944 Sold
85.5 944 Sold
78 924 (first car) RIP
Old 08-09-2004, 10:17 AM
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