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Really ! I don't remember ever having a harmonics issue due to system pressures, balance issue yes but not pressure related ! That's crazy ! How "high" are the high numbers ?? I do a/c work everyday and 20-30 low side is good ..... Not saying VA is wrong, but if I saw 6-10 low side, that means...

Very good question !! I doubt you will be able to see the blend door through the blower motor, if you can see anything will most likely be evap core, maybe heater core. not sure how that box is setup though. physically moving the door by hand will be the best

Just because the servo is working doesn't mean the door inside the box is sealing. I would pull the servo off of the door and turn the door by hand. It should move freely from stop to stop. Maybe have the a/c on and feel the temp change from full hot to cold.

Sounds like your a/c is functioning as it should. You sure your blend door is fully closed ? Allowing all the air to pass through the evaporator ? If it is not sealed fully you will get hot air from the heater core coming out of the vents mixing with the cooler air from the evaporator. Just a...

A/C is not that difficult once you work with it for a while. Have y ou felt the high/low side lines when the compressor is running ?

I agree, 6-12psi low side is too low. 20 sbould be right on. Stupid question, is the fresh air door closed or is the blower motor pulling in that hot 107 degree air which is making the a/c system seem to be under cooling ? If it is pulling in outside air than I would say a 30 degree difference...