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Old 11-27-2012, 08:27 PM   #11
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Join Date: Oct 2008
Location: Los Angeles, CA
Posts: 3,053
My Ride: 05 330i ZHP/MT
Can you try bypassing the heater control valve?
This will tell you if the problem is due to faulty valve / valve control or to clogged heater core / pipes or hoses to and from the heater core.
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