Engine Size: 4.0
Where is this vehicle prone to leaks? I vacuumed and charged this for a family member. It held the vacuum good, but lost the charge in about a week. I looked and the compressor and hoses under the hood. They looked clean and oil free.
This is just my experience with my 91 Mustang and I sure hope it isn't what is wrong with the car you're working on. It was a real ordeal finding the pesky leak that frustrated me for over a year. I had zero evidence of leaking anywhere under the hood. Still, I replaced o-rings a second and even a third time. Still leaking and wouldn't cool after a week to 10 days. UV dye was added but I couldn't see any of it leaking under the hood.
Finally, I knew it had to be the only place that I couldn't see: the evaporator ! I crawled under the car to get a better look at the water drain so that I could shine my UV light on it and sure enough, there was some yellow dye there. The evaporator was what was leaking. I replaced it about a month ago and all appears to be well !
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