AC system

1991 MERCEDES BENZ 560SEL
V8 • 2WD • AUTOMATIC
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BENZ MAN
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  • 1 POST
my car is losing freon so i apply pressuer in the system ( 250 in the high side ) just to check the leak location , and for 2 days there was no change in the pressure.(2 days not using the car at all)
but when i start using the car with the AC after charging it with freon for 5days i lost the freon agin.

i still can't found the leak
Aug 25, 2011 at 4:19 AM
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DANLESABRE
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  • 230 POSTS
You need to put a UV dye in the system, run the A/C a lot to let it circulate as much as it can and then use a UV light and safety glasses that are designed for finding leaks to locate where it is leaking from.
Aug 25, 2011 at 4:37 AM
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MHPAUTOS
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  • 31,937 POSTS
Do as suggested and i would also use a gas sniffer if you cant see any leaks, and check the vents for refregrant as you may have a leak in the evaporator and you will not see this with the UV system.
Aug 25, 2011 at 7:19 AM
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