I have a 1991 chevy silverado K1500. Had new air compressor put in last year. Was working fine now cold air only blows out of defrost vent. Even after control panel is changed to feet. ????
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: Air Conditioner works intermittently
It could be your low pressure cycle switch is going bad. Check the connection to the switch and it's is located on the A/C Accumulator. The other thing to check is the A/C relay and that is located in the glove box. There is a panel in the glove box that say's relay, there is three relays in there and one of the out side relay's out of the three is the A/C. can not remember which one it is. The middle relay is the fuel pump and the other one is the third break light. Switch the two out side relays and see if your A/C get's better. the other thing too is if the R134a is just a little low, and needs to be topped off. Good luck and hope this helps. if your going to try to recharge the A/C system your self, keep in mind not to over charge.
SOURCE: Cold Air Not Blowing Through Vents
Your last guess is probably the right one. The deflectors/directors are vacuum controlled and you may have vacuum line either broken or disconnected; these aren't fun to find. I would start under the hood and make sure the vacuum reservoir is intact (have seen them cracked) and then start tracing hoses from there.
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SOURCE: 04 silverado a/c, htr. controls. Only blows through defrost vents
sounds like your door blend actuator which is under the dash and a pain in the **** to replace
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