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2001 Audi A4 Quattro Question: a/c refrigerant leak



dcharles305, 1.8L 4 Cylinder Turbo, Wyckoff, NJ, September 27, 2010, 08:57

A/C blowing hot; refrigerant low. Recharged and leaked again. Dye tested on 3 separate occasions at 3 different shops including Audi dealer, and leak not found. One mechanic told me the line runs under the dash at one point and he'd have to remove dash to check: $1000 labor whether fixed or not. Thoughts?

2 Answers
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  • Medium-star Best Answer
    September 27, 2010, 11:03

    Possible evaporator leak. Sometimes the dye is visible at the drain hose.
    What I'd do is this:
    Recharge the system. Run the A/C with the fan on low for 5-10 minutes, than turn off the engine, turn the blower on high and check for refrigerant with a "sniffer" (electronic refrigerant detector) at the vents. If it picks up freon the leak is under the dash, after disassembling the tech should be pinpoint the exact location by using a black light. This way you won't waste your $$$.


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  • Answer #2

    DANIELLE BRAKE AND AUTO from Brake and Auto & Transmission Specialist, September 27, 2010, 21:41

    I know for a fact that when there is no dye in the exterior components then it is inside of the evaporator!! I know that is an expensive job right around 1000.00 another thing that could pin point the problem is a bad odor coming from the vents.

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