Have you tried to add any refrigerant to it lately? The pressure can go up as it heats up, to the point where the pressure switch cuts the compressor off.
SOURCE: 2004 Mazda RX8 Heater problem
There is a well known problem that is a manufacturer's defect with the soldered connection on the circuit board behind the temperature knob. There is a fix to re-solder the connections but the dealer will gladly take $450 to replace it with the same bad board that will last you a while. Look for the link to show you how to fix it yourself.
SOURCE: 2004 escalade ac problem
I had the same problem. Took it to an AC guy and they told me it was going to cost $1,400 to replace all kinds of parts. I didn't get it done right away because I went on vacation. When I got back from vacation the air blows cold. It hasn't gone back to blowing hot since.
SOURCE: 06 Trailblazer AC
Temperature imbalance is usually the first sign of low freon charge. Have that checked first.
SOURCE: 2004 RX-8 Air Conditioning Blowing Hot
The A/C control is fixing to go out. the whole modual replaced and the problem will be fixed...
SOURCE: 2004 MALIBU MAXX A/C BLOWS HOT AIR
Could be several things. The fuse relay to the AC compressor could be bad. The system may need to be recharged due to lack of refrigerant the compressor will not work unless it has enough.
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