2005 Suburban Front A/C blowing warm air

[jsturg]

I have dual control for the hvac up front and it's blowing warm air. The rear a/c is cold. Freon pressure is good. Plus the recirculating option isn't working. The button stays lit when I push it but doesn't kick in.

 

[zora]

You checked the pressure with gauges? The actuator that moves the air divertor door may have failed. If you have a fresh air filter, you checked it for being clogged?

 

[bfunke]

Is it just one side or the other in front. There is a known issue with blend door actuators and a TSB - Bulletin No.: 06-01-38-003 Date: April 27, 2006

If you hear ticking noises from below the dash it's likely the actuators. You might try this.

Remove HVAC/ECAS 10amp fuse from underhood fuse box for 60 sec
Replace HVAC/ECAS fuse
Turn key to ON but don't start engine. DONT TOUCH AC controls for 4 minutes
this allows actuators to reset.
Start engine and let run for 30 sec.
Test AC controls.
Shut off engine.

This fix may be temporary. A new actuator may be needed. I finally broke down and replaced mine and no more issues.