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Q:

A/C unit on 1990 Cadillac DeVille

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I have a certified mechanic looking at my A/C. I have had my Cadi for 5 yrs and it runs great. Now I am spending money on the air conditioning. I am up to $700 on air compressor, dryer, orifice tube, refrigerant and labor. Everything is back together but still no air. It runs its cycle like its supposed to but there is still no air. The evaporator core had a leak and it was replaced. Now there is another leak. Can't find it though.
(1) Answer
if you have a certified tech looking at it, did he install dye in the system to check for leaks. that is the first step before replacing anything to determine any and all leaks. i would start from scratch and get it diaged correctly before spending another dime.

Roy