No cold air

[PartTimer]

Just started this year, the AC blows nice and toasty, if I switch to vent, the air is cooler, but not cold. I can hear a fizzy sound from what I think is the rear compressor. Could this be a blend door issue?
1999 expy with manual controls

 

[shadow114]

I just learned about this today. Check out my post. It has all the answers you should need in it. I just posted it today also.
Ron