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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 12-05-2008, 01:58 PM   #1 (permalink)
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Question Hi Everyone! "heating wont blow thru vents"

I recently replaced a heater core and water pump on my 530I 94 bimmer and now it wont blow any hot air thru any vent, the blower motor works fine I just don't know what might be cousing this. Does anybody has anything in mind?
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Old 12-05-2008, 02:06 PM   #2 (permalink)
OMFG another one!?
 
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Something must be amiss with the ducting or the controller that decides which vents are in use.
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Old 12-05-2008, 03:53 PM   #3 (permalink)
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is hot only throught the defrost im guessing the system the system was bled? inside the cabin is the heater core. The engine warms up coolant and when you turn the knob to heat the air inside, coolant flows through. Outside air flows across this radiator and blows heat onto you. When you drain the coolant system you also drain the heatercore. When you fill the coolant back up, a large air bubble is trapped in the heater core. When you turn on the heat inside, that air bubble goes out and into the engine. I would check your coolant level immediately and bleed the system.
When bleeding the system, turn the heat on full-blast (high temp) while you let air escape from the bleeder screw.
Good luck,
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Old 12-08-2008, 05:01 PM   #4 (permalink)
Millions of them.
 
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Did you reconnect the stepper motors behind the dash?
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