Have a 2013 Express at work. It isn't driven much (28K on it presently) and the AC stopped blowing out of any of the vents other than the dash/ defrost.

I tried replacing the blend door motor, but wasn't the problem. Discovered the vacuum hose from right valve cover to a T, and then from T to a vacuum resevour on the underside of the battery tray was completely rotted. Replaced that vacuum line and now the **** to adjust airflow works again.

But the air is hot. Brought my gauges and hooked them up, and both high and low side have pressure, but doesn't seem like the compressor is cycling.

Any ideas? The air gets substantially hotter when I turn the temp to hot, so I don't think the blend door is stuck.