While driving down the road with the a/c on suddenly the drivers side starts blowing hot air while the passenger side is still blowing cold air. if i put the avalanche into neutral turn off the engine and re start the engine it will suddenly start blowing cold air again - it is happening quite a bit more frequently and i have read on some avalanche forums others have had this issue as well. when its 100+ degrees outside the air needs to work the heater i can do without during this time.