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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-13-2009, 10:20 AM   #1 (permalink)
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98 540i a/c problem

hey guys...
took 540i in to get inspection, upon picking it up was told that during the inspection the a/c blew all the freon. i attempted a new charge on the system and after 1 can, then 2, no leak/no cold air either....put half of a third can in and then the a/c started BLOWING out of the back of the compressor...
is this a pressure relief valve?? sounds to me as if I might have a blockage in the system preventing it from cooling and circulating resulting in a pressure release...and IS that a pressure relief valve on the back of the compressor??
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Old 04-17-2009, 09:09 PM   #2 (permalink)
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I haven't looked at the BMW compressor yet, but I've always had my system in my other car vacuumed down before trying to charge it. Do you do that first? If not, even though there was no refrigerant in the system, it is under pressure and adding more coolant may have over pressurized it.
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