1995 Maxima GLE Climate Control Issues.

I have the GLE with the digtal temp control above the stereo. In the winter I have to turn the temp up to 85° to get any heat at all and now my AC isn't working hardly at all even on the lowest temp. I check the AC fuse and it's fine....I checked the charge on the A/C system and it actually reads "over charged".....Any thoughts??? What the @#$&!?!?