Question about BMW 525

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89' 525i My AC, is fully charged, the compressor's running, but all I get is warm air. Is there a control unit, (electical) that could be out, or is it possible the expansion valve is stuck, it must be in the dash, I don't see any under the hood. Thanks. Kevin in Tulsa Kevin.Ferrall@yahoo.com

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  • catcher16 Jul 26, 2008

    '90 525i has the same problem, but I couldn't find any hoses lose. I added 2 cans of freon that brough it to 45 degrees on the low side, 275 degrees on the high. Any ideas?

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Check the pressure on the low and high side " with a meter " and low side should be around 45, high side should be around 250 - 300 if it's over 300 there is an obstruction if it's less it needs more freon.
also you have flaper motors that are either electrical or by vacuum.
and i think it's a vacuum problem because of the year model.
they aren't switching from warm to cold.
take the climate control module out and look for any un-hoocked rubbery line or a broken one

Posted on Jul 09, 2008

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