DESCRIPTION
Automatic Climate Control (ACC) system uses a microprocessor located in the auto amplifier to control passenger compartment temperature. To improve driveability, the compressor is controlled by communication between auto amplifier and engine control unit. The auto amplifier has a self-diagnostic capability.
A/C system components include compressor, condenser, evaporator, receiver-drier, control panel (includes auto amplifier), fan control amplifier, water temperature sensor, ambient temperature sensor, pressure switch, evaporator sensor, sunload sensor, in-vehicle sensor, condenser fan, aspirator, related vents, wiring and fuses. (Scheme 1)
Scheme 1
SYSTEM OPERATION
When temperature adjustment switch is set to desired setting, auto amplifier calculates signal inputs sent from various sensors, switches and engine control unit. These calculations are used to operate air mix door, fan speed, mode door, intake door and compressor to reach desired temperature setting.