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a/c refrigerant leak on 2001 Audi A4 Quattro

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?

Asked by for the 2001 Audi A4 Quattro
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
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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.