HVAC System - Manual - Escalade, Pickup, TAHOE & YUKON: Description
WARNING:
To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY article in GENERAL SERVICING.
The A/C system is a Cycling Clutch Orifice Tube (CCOT) type, with a fixed displacement compressor, and a pressure cycling switch to control evaporator temperature. Electric motors are used to control mode, temperature, and recirculation doors. A series of relays and a resistor are used to control blower motor speed. Motors and relays are controlled by A/C-heater control assembly knobs. The A/C-heater system is a blend-air system. Air entering vehicle passes through evaporator core and through, or around, heater core to provide desired temperature.
Escalade, Tahoe and Yukon may be equipped with an optional auxiliary (rear unit) A/C or A/C-heater system. Auxiliary system operates with main A/C-heater system, but has separate blower controls.