In my 2004 wrx, the air conditioner will sometimes not blow cold air, does it mainly on hot days. its as if the compresser stops spinning on its own. the compresser was already siezed up and was replaced in june 08

Yes I am find to drive

Turn your air conditioner OFF and turn your heater ON. Air conditioners were designed to blow out one temperature of air... COLD.

Low freon will cause the compressor to short cycle, when the compressor runs the pressure in the low line is pulled down and the low pressure switch turns it off. Not running the pressure builds up and turns it back on. In the old days there was no low pressure switch, with no freon to carry the oil the compressor was destroyed.

Someone will need to find out if the compressor clutch is failing, or if it is loosing power due to a pressure switch or other problem.
A faulty relay or switch could get hot and switch off power to the compressor.

Could be a list of things including low on freon, low pressure switch, relay, or the a/c clutch on the compressor.

2004 Suburban air conditioner blows hot air to the dirver side but cold air to the passenger. This does not happen all the time but has occurred several times this last summer.

car air conditioner blowing hot air , this kind of problem often cause by a refrigerant leak or clogged condenser.

check the freon level

hello,seem you need to send your car to authorized dealer to scan the problem,maybe the solution is only synchronizing all the flap,ty

check too se if cooling fan is operating