yes my air is charged. Its 90F today. 99 ML320. I have to put in 16 ounces of R22 in every summer.

This problem has exiosted for months. Didnt bother me until todays heat wave.

I will have the dial on blue and it may be cold then hot, its always hot when dial is in the red. with the compressor button in or out the heat and cold behave the same. with the exception of 30% of the time it blows clod when the ait button is pressed.

The fresh air setting seems non existant.

In the Blue setting, most of the time it blows HOT.
I do not mean outside tempature hot, hotter than that like my switch is telling the vacuum lines to open heat and cold vents randomly.

Is there a commom problem or fix anyone knows of ? Have not done an exorcism... yet.