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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 07-04-2004, 10:23 PM   #1 (permalink)
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gambino is an unknown quantity at this point
I have a 85 528e, 85000 miles runs great. But anytime i turn the airconditioner on the cold air blows air through the front regular vents, and then there is heat which comes through the defrost vents, and the floor vents at the same time.I know this should not be happening. Any help or info given will be greatly appreciated.

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Old 07-06-2004, 10:42 AM   #2 (permalink)
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Dead heater control valve. Hangs on the middle of the front of the firewall. Two ~1" coolant hoses and one electrical connector going to it. You can replace the core with a $30 Bosch part whose # I don't recall. BMW doesn't sell them except as a complete ($$) unit, but Benz, among others does. It's a drop-in part.

Biggest problem may be getting those four damn little screws out. The sage advice is, when you do, replace them with phillips heads or bolts.
<span style='font-size:8pt;line-height:100%'><span style='color:red'><span style='font-family:Optima'>C.R. Krieger
'88 535is Da Red Dog</span></span></span>
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Old 07-07-2004, 09:32 PM   #3 (permalink)
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I don't believe the heater valve is the problem.
Whenever you turn on your a/c, there is a flap in the heater box that closes and stops fresh air from entering the car(recirc. mode). This flap is electric and is probably malfunctioning.
86 535i
99 Passat V6
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