Air it only coming from floor and defrost vent not from dash vents
This is actuated by vacuum and you have a line off the actuator that moves the position of the flaps.
SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR
Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.
SOURCE: Problem with air not coming out of vents.
Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.
SOURCE: my 2002 trailblazer is making a clicking noise in the a/c
more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange
SOURCE: All Air Conditioning blows our the defrost vents
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
SOURCE: I have a 2002 Dodge Ram where vent selection won't change
Your heating and air conditioning system is controlled by the Body Control Module (BCM). Any diagnosis should begin with scanning the (BCM) for trouble codes to determine the source of the problem and/or which circuits and components are involved.
If a failed mode door actuator is, in fact the problem, the instrument panel must be removed to gain access to it.
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