No ac only heat comes out the face vent 30 percent of time. other times it comes out of the defrost. any suggestions
Check when you activate the hot cold switch that the heater tap is actually moveing. Your heater may be stuck on
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: dash vents not working
It may be the actuator not working properly. Should be above the accelerator pedal to the right.
Keeme
SOURCE: Heat and AC vent problem.
most likley you have a vaccume leak somewhere but also the linkage to the door that that directs the air flow may be in a bind. another possability is the hvac controlls. hope this helps
SOURCE: 2003 Trailblazer No air from front face vents
first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.
SOURCE: ac wont come thru vent on 97 chevy blazer
Check the vac lines for leaks on the drivers side rear of the engine compartment. The ones going to the vac ball attached to the hood.
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