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Re: air only works on high
Your blower resistor is bad look under rt side of dash by the blower motor you will see a flat plug into a piece bolted in air box this is the resistor. the wires are bad about burning up also un plug and check that if so gm sells a replacement plug. sometimes you can clean if you caught in time
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Had exact same problem with my 2006 Chevy Silverado 1500. Would blow hot air thru drivers vents only and sometimes if I turned truck off and restarted would blow air conditioner for a bit. Rec'd recall letter from Chevrolet in January for this problem.
There are controls in your car where you can control the flow of air to certain parts of your car. Make sure that you have it turned to where it blows out of all of the vents and then the air should come out of the dashboard. If this continues then there might be a ventilation hose that has been disconnected and is not getting air to that part but the other hoses are still connected.
I had a similar issue on an 05 silverado. Air would only blow out of defrost vents. But this worked for me:
1) Unplug HVAC fuse for 10-30 seconds
2) Start truck
3) A/C comes out defrost - wait about 10 to 15 secs
4) A/C then starts coming out the floor vents for about 5 seconds
5) A/C then starts coming out the dash vents.
6) While the A/C is coming out the dash vents, turn A/C OFF (otherwise it cycles back to defrost for good).
7) Turn truck OFF
8) Restart truck and it should work fine
(Found solution on another forum from user "ccurran")
There is a flap in the venting that can stick. This vent is contolled by a vacuum operated actuator that may be leaking. This actuator has a vacuum hose that runs to the contol panel. Check the vaccum lines hear as well.
check under the dash to see if the blend door is operating, this ian internal door between the heater core and the a/c evaporator. also check that the drain hose from the evaporator make sure its clear and water is coming out of it,otherwise the evaporator will freeze solid and therefore no cold air
i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............