On my 2004 lancer es the air conditioning works ice cold intermittenly then goes warm. I turn it off and it will come back on cold and work for a while longer. Ihave had the system checked and it is serviced to its proper level. the temp knob is a little stiff yet it does go max a/c to hot. this just started happening, I was thinking the blower motor resistor pack yet i don' have an idea where it is!!

I just switched out my compressor today after over a year of my air doing this until it finally went out....(it only blew hot air). Replacing the compressor seemed to work. it is pricey though. dealership charges and arm and a leg. (i think the quoted the compressor at like 1000 not including labor.) my knobs are also messing up, but the one that switched from regular air to defrost. they only sell the knobs in a pack of 3 and are charging 300 for that....but i say good luck!!! its pricey...they shoulda recalled the cars. this is a very common problem i have been seeing. all they wanna do is make money off of it.
anyways the new compressor seems to be working.