Originally Posted by ramvan2500
You may have to get your A/C System Evacuated and Charged with new Refrigerant. I would recommend that they put new Oil in the Compressor as well, either it be ester or PAG.
My bet is you have a vacuum leak as a result of a broken vacuum line. Your symptoms are classic. It's usually a simple/cheap fix once you find the problem. Does anything not work, such as your cruise control? A broken vacuum line right at the cruise control was a notorious problem on mid to late (96/97/98) Rams Dunno about later models, but I'd put money on a broken vacuum line or bad check valve. Just my 2¢
The check valve is under the hood inline with the small hard (brittle/easily broken) vacuum line that runs through the firewall into the cab. One (of several) purposes of this check valve is to hold the AC/Defroster air damper shut during amild or normal acceleration (less than full throttle). Your complaint is a common one and a bad check valve or broken vacuum line will 99.9% of the time be the cause.