Rule one thing out.... make sure you're coolant reservoir is full
The compressor has a thermal switch, if it gets too hot in the engine bay, will turn off, then back on when it's cooled off.
SOURCE: I have a 2004 GMC
Remove the Positive Battery Terminal, leave the Negative Terminal connected. Wait 30 minutes. Attach the Positive Terminal. Verify temperature settings is around 70 degrees. This procedure has been known to resolve computer settings.
SOURCE: AC Blows cold then hot
I had this happend to me on my 2004 2500 in july in S.C.I turned the key off and on 5-6 times and i have not had that problem again.
SOURCE: 2004 chevy tahoe, dual climate control, blowing different temps
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
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: i have a climate control problem on 2004 gmc
The likely problem is the blower motor resistor pack is defective. It is located behind an access panel below the glovebox. Go to www.trailvoy.com and do a search on "blower motor resistor replacement"
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