The air conditioner blows cold on normal A/C. When on Max, when I accelerate, the air changes to defrost and sometimes floor. I can change it back to normal and it blows through vents again. From reading online it sounds like a vacuum leak. How can I find and fix the leak if this is the case?
The mode door and mode actuator change where the air comes out. It's operated by vacuum. So you either have a leak or a bad mode door actuator motor.
SOURCE: Heat wont blow through heater or defroster vents
The door in the heater box is most likely stuck. It is located under the dash on the passenger side
SOURCE: Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
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: Auto climate controll only blows through defrost & floor,not the
it either has a vacuum line on the back of the unit off or the control unit is bad
SOURCE: AC cold air out of my defrost vents
u need to check the vacuum from the engine to the ac control head, the air defaults to the defrost when the system looses vacuum from the engine, this is for safety.
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