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Old 01-21-2011, 10:09 AM
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timfitz63 timfitz63 is offline
MT = Doppler Shifting
Location: Lorena & San Antonio, TX
 
Join Date: Aug 2010
Posts: 869
Mein Auto: 2007 X3 (MT)
My first thought was to be sure there was sufficient coolant level in the reservoir; if it's below the "MIN" mark, the heater will blow cold air. Sounds like you've checked that, though.

My next thought would be the thermostat sticking or a coolant flow line getting blocked somehow...?
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X3 w/6-speed & Sport Package:
A sports sedan disguised as an SUV...
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