What would cause my a/c to blow from the top(defrost section)?

Question

My a/c started to blow only from the windshield vents, I don't know why.Can I fix it at home?Thanks in advance.

Answer 1

They always go to defrost when the control doesn't work since that's the one position you can't live without some mornings. Whatever's wrong is probably inside the dash somewhere and would probably very hard to fix if you haven't done it before.
One thing you can look at is the vacuum line that goes from the engine compartment to inside the car. It powers the a/c controls, and if it's off or leaking you'd be stuck in defrost.

Answer 2

You didn't state which manufacturer but here goes...

Most new control heads are electronic, although some are cable. Vacuum isn't widely used on new cars (less than 5 years old) GMs electronic control heads will default to the defrost if the Control head loses its signal. This is for safety so that you will always have defost in the event of a malfunction. The plugs on the back of the control head would be the first thing to check AFTER the fuses.

Answer 3

ought to be low on refrigerant, would have a bad compressor, would have a clogged orifice, would have a limited condensor, would have a limited evaporator, ought to be overcharged, ought to be contaminated with air, could be a loss of or too much PAG oil. ought to be your temperature door on your hvac module is undesirable, or a caught temp door blowing warm each and every of the time want greater archives. pressures , vent temperature, ambient air temperature and humidity would be super first of all !!!!!

Answer 4

Might be a vacuum leak to the hvac control or a stuck directional door. Fix at home, how handy are you? I would let the professionals look at it.

Answer 5

Is it even slightly possible that the selector is in the "DEF" position?

No?

See first answer.