AC Warm At Low Rpm

” Just recently my AC evaporator has a leak and has been replaced by a technician with a new evaporator. However, during engine idle(RPM 1000), cooling is poor while during high RPM 1500 and Up, cooling improved significantly. I hope you have a suggestion on what to do next. Thanks.”

It could be a few things doing that. One, he just might not have put the correct amount of refrigerant in. Two, he may not have changed out the AC drier, in which case the system wouldn’t flow right at low speeds ( ALWAYS change the drier when the system is opened up.) Three, it could be a cheaper aftermarket evaporator which just won’t work as well because the cooling tubes inside it are too small, I see that a lot with cheaper Chinese made replacement evaporators. These are the three most common mistakes people make when working on an AC system that would cause your exact problem. Good Luck,