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?
a/c refrigerant leak on 2001 Audi A4 Quattro
by dcharles305 in Wyckoff, NJ on September 27, 2010
ANSWER by ZeeTech , September 27, 2010
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 $$$. Zee
ANSWER by DANIELLE BRAKE AND AUTO , September 27, 2010
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.