You can get air trapped in the heater core, but it sounds as though you've bled the system correctly. Have you attempted to flush the heater core to check for a blockage? Also, the blend door sometimes gets stuck, one/more of the vacuum lines/solenoids that controls the blend door could leak/break (including the main vacuum supply line entering the HVAC unit from the engine compartment)
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Wednesday, February 23rd, 2011 AT 2:27 AM