Model: Sierra 1500
Engine Size: 5.3L
Country of Origin: United States
Just got through installin K&N Air Intake..All I did was disconnect neg batt terminal and unplug mass air flow sensor..Everything else was just physical tubing/gasket install..
Now with AC on, all I get is hot hot hot air blowing in defrost section only...NO AC and cannot switch to face forward blow or feet blow..Speed of fan works and controls on display show everything should be where it is, but not happening..It's like it defaulted or something..I rechecked all connections that I may have bumpe during installation and connections of Mass Air Flow system..All proper & tight connections...When I rechecked the AC this morning, I did it before crankiing up truck and this time it switched to feet and facial blow , but when started it went back to defrost section and hot again...
Please help...Anyone...WHAT HAPPENED??
Double check that your wiring did not get unplugged.
FIXED....I unplugged the fuse one more time and tried again-nothing...I shut the AC off and the ignition...This time I turned the ignition to listen to anything unusual..Heard actuators working...Without turning on AC, I cranked the truck and then cut on AC, heard actuators again, Cold AC....Waitied....Still Cold AC....Waited some more...Still Cold AC...Shut off truck and restared several times---Still cold....Hope it lasts..
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