The air on my 2010 Laramie Ram used to blow somewhere around 30 degrees from the vents but recently it got a lot hotter so I took it to the shop for repair. They found the freon a little on the low side and a small leak in the evaporator.. after charging the system, installing a new evaporator, dryer and expansion valve, the air temp is now blowing 60 degrees with an outside temp of 89. I know it should be cooler than that and it used to be a lot cooler but the shop claims that is "normal" and the vent temperature is where it should be at 60 degrees so refuses to do anything else to repair it. They can answer my Better Business Bureau complaint and the small claims suit I intend to file... But my question is: What else could be causing the vent temperature to be 60 degrees when it used to be much cooler? There has to be another component in the system that isn't working correctly. Any advice would be appreciated. 60 degree air from the vents takes forever to cool the cab.

Thanks in advance

 

60 at the vent is too warm. It should be around 45 after the unit has been running for a while in full blast and recirculate. The blend door can cause the temp to be hotter as it mixes hot air with the cool air. So the problem may not be the AC itself but the blend door. If you want to see if the AC is cooling enough, a good way to "sort off test it" is to run the AC and open the hood to feel the AC lines, the top one should be cold and condensating.

Mine was blowing 60 degree air (I put a thermometer on it) and I had a leak in the condenser. Touching the top AC line under the hood showed it was warm. After a new condenser an recharge, it blows 45 degrees and the line is cold.

BTW, no away your AC was blowing 30 before as it would ice up the system, AC units blow above freezing at the source, maybe 35 degrees but by the time the air gets to the vent it's about 43-45 degrees.