Heating Operation: Notes
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of the heater is to supply heat to the interior of the vehicle. The vehicle operator can determine the level of heat by turning the air temperature control switch, located on the HVAC control assembly, to any setting. The air temperature actuator position is directly effected by the position of the air temperature switch. This position will not change with an A/C request.
When a warm air request is made the HVAC control assembly will position the air temperature actuator to divert most of the air flow through the heater core. Blower motor and system mode can be changed regardless of the air temperature setting.