Section 33 (A/C-Heater System - Manual): Description
The manual A/C-heater system uses 3 rotary switches to control A/C-heater functions. The electric actuators control blend-air door, mode door and outside/recirculated air door. Air is circulated through 5 different front outlets and one rear outlet.
When A/C switch is on, a signal is sent to Body Control Module (BCM). BCM requests A/C operation from Powertrain Control Module (PCM). Response is based on control knob positions and evaporator temperature.
A/C-heater system can be checked without pressure gauges. A/C system functions can be checked using Chrysler's Diagnostic Readout Box (DRB). Vehicle A/C functional test can also be performed using built-in self-diagnostics. See FUNCTIONAL TEST under TROUBLE SHOOTING. Pressure transducer replaces high pressure, low pressure and fan control switches. BCM drives and monitors control door positions based on information received from other vehicle systems, sensors and switches.