Air conditioner works but air wont come out of vents, like they are stuck in defrost mode
It is all electronic these days an electric motor is controled by the selector on the dash. Remove the dash surround: gear selector in 1st engine off, tile steering wheel down, push down FIRMLY on the top of surround and pull towards you and off it comes. Remove the two screws that hold the heater/air cond. control in, there are 4 plastic clips as backup release them and gently remove the control, inspect for loose connectors (there are 2) it helps to run the blower to see if you have found the problem- I did.
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: 2005 tahoe no air blowing
as long as all the fuses are good.. its probably the blower resistor/module... located next to the blower motor under the pass. side of the dash..
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: 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: astro van 1997
There is a flap in your heater box that is controled by your vent switch by your heater controls. listen for a vacuum leak. that is common and hopfully the problem. there is vacuum lines that control the vent door that redirects the air to your vents.
Has your dash been messed with recently? if so i would check there first. you should hear a hissing if thats the problem.
Otherwise these also are common for that door flap to break and not switch NE more. thats the only 2 things that i can think of off th wtop of my head to be the problem. this would require the whole dash to come apart if its this problem
Michael
ASE certified
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