C 1500 Suburban 2WD V8-5.7L VIN R (1996)
Control Assembly: Description and Operation
Control Assembly Description
System Components
OPERATION
The air conditioning system is electronically controlled. Three backlit, rotary knobs provide full control of the system. These rotary knobs control
blower speed, air temperature, and mode of operation. Two push-to-latch buttons select recirculation mode for maximum cooling and control over the
air conditioning compressor.
The blower speed rotary control has four fan speeds and an off position. When the blower fan is turned off, all HVAC operations turn off also. The air
inlet door is automatically placed in the recirculation position by the recirculation actuator.
The temperature rotary control has 180° of travel. A detent at the full cold-end of travel engages recirculation. Operating the system with the
temperature control placed in this detent will result in maximum cooling. Air inside the passenger compartment will be recirculated through the blower
case. Outside air use will be minimal. Recirculation can also be manually selected by pushing the "RECIRO" button.
The mode rotary control has three major detents to indicate "VENT," "FLOOR," and "DEFROST' mode positions. Placing the control anywhere in
between the major detents results in air output blending between the two modes. The recirculation mode is not available anytime "DEFROST' is
selected, or while air is being blended out the defrost outlets.
Automatic recirculation will occur when compressor head pressures exceed 2275 kPa (350 psi) and disable after head pressures reach 1724 kPa (250
psi). When activated, it cannot be manually disabled by the "MAX" button.
