Question about BMW 120d
Replace thermostat,theb replaced heater control valve
Sounds as if a flapper door is not working. Vacuum line leaking or bad actuator.
Posted on Dec 02, 2014
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Posted on Jan 02, 2017
SOURCE: 1997 F150 heater problem
your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.
Posted on Feb 21, 2009
Bad vacuum pod, try using a mini vacuum and the on the valve block behind the glove box take suction on each one till you find the bad one.
Posted on Jun 15, 2009
Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.
Posted on Apr 16, 2010
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