Grand Prix V6-191 3.1L VIN M SFI (1998)
Control Assembly: Description and Operation
With Dual Zone A/C
Automatic Heater A/C Control
The automatic A/C control, uses short-travel, soft-touch buttons for selecting the mode, temperature and blower speeds manually, if desired. In the
automatic mode, the desired temperature is set by the driver and a microprocessor utilizes this information along with the two air temperature sensor
inputs and a solar sensor input, to provide the desired comfort level. The driver can override the automatic system by selecting mode or blower. The
HVAC system will operate in manual mode only.
The microprocessor also provides for system self-tests which result in diagnostic codes being displayed. Faults in the inside and outside temperature
sensor circuits and temperature valve control circuit are identified when the control is set to the diagnostic mode.
