I have an 02 supercrew. When I put my air conditioner on Max or auto, the air will only discharge through the defrost ducts at the windshield. All of the other settings discharge from their designated ducts. I can't find any broken or diconectd vacuum lines under the hood. Could someone please help. It's hot as hell here in New Orleans.

 

Sounds like a blend door malfunction... I'm going to move this thread up to HVAC where I think you'll get better service...

Good luck!

 

I have had same problem. I can manipulate it by going auto mode and increasing temp this takes some patience. Friend had same problem and had to replace his.

Jeff

 

Ditto...I figured out today that I also could manipulate it. pain in the Butt. Did he just have to replace the controls, or the whole system?