2001 Sub Air Conditioner controls problems
 

I have 2001 LT Surburban. I have the following problems with the environment controls:
1. the blower only runs when set to the max setting.
2. the compressor will not run (for AC or defrost).

The fuses and compressor belt are fine. The compressor was replaced 4 years ago and had always worked great since then.

I could have multiple problems but was thinking of first replacing the Heater/AC controls. Does this sound like a good first step?

Thank you, Bill.

Welcome to the forum.

1. Sounds like the blower speed select resistors are shot. The hi spd bypasses them and applies 12V directly to the motor.

2. Is 12V being applied to the compressor clutch? Could be that the freon charge is too low to energize the low pressure switch. Need to verify the freon level.