yesterday i got in my truck and all of a sudden none of the A/C options is working, no matter what option i put it on ie. max a/c, a/c, panel, etc... it blows out of the windsheild vents... any suggestions on what it might be?... thanks

 

Anyone??

 

So, its stuck on defrost? Most likely you have broken vacuum line to the control head. Typical location for problems would be behind the battery along firewall. Should have a one-way check valve. Hose should be black in color. Check to make sure you have vacuum there. If the control head loses source vacuum the system defaults to defrost?

 

Thanks a lot man, it was exactly that... Got it all fixed