A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

coolant issues?

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Old Sep 16, 2012 | 06:16 PM
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Hi, I have a 01 A4 1.8t and it looses coolant, sometimes I need to fill it from bottom of reservoir once a week and like today i haven't needed to fill it up in about 3 weeks. I pressure tested multiple times and it doesn't leak, it only leaks when it sits overnight, what could the problem be?


thanks, Matt
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Old Sep 17, 2012 | 08:08 AM
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Can you notice coolant under your car or is it just disappearing?
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Old Sep 18, 2012 | 05:27 AM
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yes there is a puddle.
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Old Sep 18, 2012 | 05:44 AM
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Originally Posted by Matt01A4
yes there is a puddle.
Where is the puddle in relation to the engine bay? Front, rear, driver's side, etc...?
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Old Sep 18, 2012 | 05:51 PM
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more towards the front, but i see dried up coolant on the middle to rear of the oil pan. I was thinking it was the water pump which was replaced lat year, but that failure happened instantly, but this problem has been going on since febuary and its not that bad, but sometimes it is that's why im lost. i checked all the hoses and there good to.
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Old Sep 18, 2012 | 07:59 PM
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It could be your thermostat leaking, or even the water pump itself. You should take the belly pan off while the car is hoisted and see where it's coming from.
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Old Sep 18, 2012 | 08:51 PM
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Originally Posted by GTA_Driver
It could be your thermostat leaking, or even the water pump itself. You should take the belly pan off while the car is hoisted and see where it's coming from.
thanks for your help. I feel like its the water pump but does it make any sense that its been leaking for months and hasn't failed and it doesnt leak when driven?
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