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Audi A4 1996-2001, S4 2000-2002 (B5) Slow Drip Coolant Leak


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Last Post: Jun 15, 2009 1:00 AM Last Post By: jimrobertson
audiangel

Posts: 95
Registered: 01/22/07
Slow Drip Coolant Leak
Posted: Dec 27, 2008 6:13 AM
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Had pressure test on coolant system last week, resulting in no leaks found. However I am very slowly loosing coolant, before I take it back to check for leaks again I wanted to throw out my observation for anyone's opinion.

Ive placed a shallow pan underneath where I believe the leak to be coming from... best I can tell... and I know its more complicated than this BUT... the slow drip leak is coming from what I believe to be the CENTER back of the engine block. In the mornings after a days driving perhaps a teaspoon at most coolant has collected on the pan. Any heads up or opinions before I take it back to my Audi guy???

Oh.. and its a 1996 A4 2.8 164K.... all service has been maintained. Last timing/water pump/thermostat/belt etc. change was at 140K
JADAmbra

Posts: 5
Registered: 11/07/05
Re: Slow Drip Coolant Leak
Posted: Dec 27, 2008 8:44 AM   in response to: audiangel in response to: audiangel
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You may want to check your resevoir cap (cooling system cap), if it is bad it will leak out the bottom of the resevoir tank through a drain and drip on the engine in the back in the middle which might be your problem, especially considering you don't have a pressure leak with a pressure test. I noticed from reading your other discussions you've replaced your resevoir, did you replace your cap yet?? If not that may be an inexpensive solution!!!!!
audiangel

Posts: 95
Registered: 01/22/07
Re: Slow Drip Coolant Leak
Posted: Dec 27, 2008 9:21 AM   in response to: JADAmbra in response to: JADAmbra
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Hello JADAmbra Thanks for replying..... Yes when I replaced the resevoir the cap was also replaced. Could it be that I am possibly overfilling the resevoir. When I recently had my oil cooler and oil pressure valve replaced I also had many of the hoses replaced.. BUT... the reason I took it for the pressure test is that one sunday morning my coolant level indicator light came on, my level was low by about 1quart the very next day was the pressure test and nothing was found, It was suggested that the coolant system my have burped out a trapped air pocket and thats why I had to add more coolant???? Ive had no sudden drop since then... is it possible to overfill the coolant tank??? could that be it??? And also .. how can I tell if the resevior cap is BAD? It is new and when the engine is hot and you unscrew it there IS pressure behind it.... How do I know if its faulty??

Thanks!
JettaRed

Posts: 61
Registered: 06/25/04
Re: Slow Drip Coolant Leak
Posted: Dec 27, 2008 10:45 AM   in response to: audiangel in response to: audiangel
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Every VW and Audi has a ghost (poltergeist) that will from time to time do wierd stuff to your car. I had the phantom coolant loss from a 2000 Jetta, never to happen again. I had a phantom oil loss from my TT, never to happen again.

Just be sure to check your fluid levels everytime you add gasoline.
audiangel

Posts: 95
Registered: 01/22/07
Re: Slow Drip Coolant Leak
Posted: Dec 27, 2008 11:09 AM   in response to: JettaRed in response to: JettaRed
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LOL... Interesting theory JettaRed... I'll take it under advisement. I am anal about always checking fluids anyways so Im all set there. Good advice for any German car owner though.
JADAmbra

Posts: 5
Registered: 11/07/05
Re: Slow Drip Coolant Leak
Posted: Dec 27, 2008 3:40 PM   in response to: audiangel in response to: audiangel
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I don't know how close to TN you are but I'm a Mechanic if you need one just visit my site @ jadtechandservices.com. I know you stated you don't want to pay the dealership (or stealership as they should be called) prices or bring you car to a mom & pop, Just an alternative!!
passare1

Posts: 24
Registered: 11/25/03
Re: Slow Drip Coolant Leak
Posted: Jun 11, 2009 12:21 PM   in response to: audiangel in response to: audiangel
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We had a slow coolant leak on our 96 A4, turned out to be a hair line crack in the heater hose where it went into the heater core (leak was under engine > hard to find)
jimrobertson

Posts: 4
Registered: 12/25/05
Re: Slow Drip Coolant Leak
Posted: Jun 15, 2009 1:00 AM   in response to: audiangel in response to: audiangel
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Look for coolant leaking from bottom of coolant bottle. When the're old the high pressure release starts to leak. Also check the temp switch at the back of the motor.See Bentley manual for location.

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