My 2002 Buick Century has developed an airflow problem in the climate control system. It has a split passenger/driver manual, not digital, control system. All of the controls seem to work fine. The fan speed switch does change the speed of the fan and all positions work. The duct control also works properly switching between defrost, heat, a/c, and the blends. When the passenger temp control is adjusted a motor can be heard in the dash as well as when the driver temp control is adjusted. When the temperature control is placed in the cold position and the speed is set to high, cold air blows robustly from the proper duct selected by the switch. When the temperature control is placed in the hot position, hot air flows forth at a gentle breeze even with the switch at high speed and the blower spinning at high speed. When the temperature control is set somewhere in the middle, warm air blows slightly harder than the hot setting but nowhere near the velocity of the cold air setting. This airflow phenomenon occurs regardless of which duct the air is blowing through or which side. I have opened up the housing to see into the heater core area and do not see any obstructions. I have also changed the cabin air cleaner located in the windshield wiper plenum. Any ideas?
Jan 5, 2012 at 6:29 PM
