Mystery coolant leak
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AudiWorld Member
Joined: Jan 2003
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Mystery coolant leak
My 02 is leaking coolant at a very slow rate. Don't see any obvious signs of a leak underneath. No puddles. But I have to replace a quart or so of coolant about every 3 weeks.
Any guesses as to where its going?
Thanks
Any guesses as to where its going?
Thanks
AudiWorld Newcomer
Joined: Mar 2005
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Could be the heater core. This happened to me, similar symptom (adding coolant every 3 weeks). If so that's a costly repair since the dash has to be removed to get at it. The other option is to bypass the heater core so it won't leak. But then, the heat won't work.
Audiworld Junior Member
Joined: Jul 2011
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Auxiliary pump leaks only when the car is running. You will lose coolant over time and not see it under the car. Not enough leaks out to raise the temperature and the pressure decreases the more fluid you lose. If it is the heater core you will smell it inside. To check the first option, look below the intake on the back side and see if anything is wet. Or do a pressure check. If it is the pump, don't bypass it or you could burn up your turbos. Good luck.
AudiWorld Member
Joined: Apr 2000
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Could be the water pump starting to weep. When was your last timing belt service done?
I had a very slow coolant leak also that I couldnt find for almost a year. When I finally got around to doing my timing belt service, I waited till 85K miles, I found the water pump leaking and the coolant was dripping on one of the TB pulleys. The bearings in the pulley were destroyed from the coolant and I had pink slime (semi dried coolant) all over the place. The slime explained why I could not find the leak since the coolant was drying faster then it was leaking so it never left any puddles.
I had a very slow coolant leak also that I couldnt find for almost a year. When I finally got around to doing my timing belt service, I waited till 85K miles, I found the water pump leaking and the coolant was dripping on one of the TB pulleys. The bearings in the pulley were destroyed from the coolant and I had pink slime (semi dried coolant) all over the place. The slime explained why I could not find the leak since the coolant was drying faster then it was leaking so it never left any puddles.
AudiWorld Member
Joined: Sep 2001
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water temperature sensor ?
Its not far from the afterrun pump, Mine had signs of crusted up coolant, Another leak possibility is the coolant expansion tank, if its yellowing and shows signs of cracks, its time for a new one
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