no air

The only way to turn on the 2005 Tahoe is by remote access and placing the key in. Everything is fine when it turns on. The moment I press the brake to put it in drive, the brake light on the instrument panel turns on, 4wd goes to the lowest gear, and the air conditioning turns off. Already...

I have 95' with some air duct issues. I have replace 2 of the three actuators, the third, above the gas pedal, has cracked gear but still works. The isssue is, I have no air from the dash ducts. There is air from the floor and from the defrost, when switched to defrost. I can switch the...