My 2001 Dodge Ram 1500 5.9L, air conditioning goes from vents to defrost and the

sounds good. thats what I'm going to do first light. I hope its a quick and unexpensive fix. thanks for your input.

Okay l have canister purge solenoid. I have a EVAP canister. andy paper canister purge solenoidall these three items are located on the passenger side firewallwhich is a big part of my system.. I don't see a check valve. I did check every vacuum holes every line from the top to the bottom from back bumper to the front bumper no leaks.. I didn't check the check valve to see if it was good or not