I have a 2001 Ram 1500 QC 4x4 Sport with a 360 in it. Now that the heat is unbearable, I have noticed my A/C isn't cooling like it should. I charged it the other night and it blows very cold air.....but just for a bit. After about 10 minutes the air starts getting warmer and warmer. Any ideas?? Thanks!!

 

Perhaps a broken blend door or "wild vent" issue. I disconnected my heater core and my A/C started blowing cold again.....

 

^ Happened on my GFs 01 cummins

 

Check the blend door. Should be a little motor on the bottom side of the heater box, just to the right of the trans tunnel. Might be able to look in there, and see if it is doing anything. If it is constantly turning..... there's the problem. Check out HeaterTreater.net for the fix.