I also read that it could be the blend door actuator. I messed with the AC some more yesterday...I put the temp all the way over to heat on the diver side control and the air pressure went way down out of the drivers side vents. Temp stayed the same because I bypassed my heater core. Put it back to cold and the pressure picked up. I put the passenger side to heat and the pressure stayed the same...Does this mean my blend door actuator is bad on the drivers side??? I remember I replaced the passenger side actuator several years back, but don't remember what was going on that made me change it.