Quote:
Originally Posted by Graplr
You could do like I said. Put a minimal charge in (just enough to get the compressor to spin). Then add dye and run the ac. If you do it on a humid day you should see condensation dripping from the bottom of the car. Put a UV light on it to check for dye leaking at the evaporator.
Or you could do 20 hours of work on a hunch that it is leaking at the evap and then possibly find out that the evap was fine.
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Yes, this is one of the best methods for diagnosing an evap leak. The only thing I would add is that if you don't get to the condensation water with the UV light, raise the car and examine the condensation drain tube CLOSELY. It will have left a trace, but you will need a strong UV light and the yellow glasses to see it.
Best of luck