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      05-14-2020, 07:14 AM   #10
technician117
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Drives: 2000 M5, 2001 M5, 2013 M5 6MT
Join Date: Jul 2018
Location: Buffalo

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1990 BMW M5  [0.00]
2000 BMW M5  [0.00]
2013 BMW M5  [0.00]
The hissing noise is due to the low charge. Mine was doing that last year. I threw a can of refrigerant in and the noise went away and the AC was cold again. My guess is when I go to use the AC this year it will be warm again. I'm banking on needing a new condenser, which I will buy and install this summer when I can get my other M5 on the road. (damn DMV's are still closed in NY from the pandemic)
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