Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description & Operation: Notes
The A/C-heater system consists of refrigeration system, heater system, air distribution system, and mode/temperature control system. In automatic mode, system determines appropriate air intake location, air discharge location, fan speed, and discharge air temperature, based on selected temperature settings and information provided by the system's network of sensors. The sensors receive a 5-volt reference signal sent by a control module. The current passes through a thermistor or resistors inside the sensor and the drop in voltage signal is received by the control module providing sensor values.
The Instrument Panel Module (IPM) reads information from Ambient Air Temperature Sensor, Inside Air Temperature Sensor, Sunload Sensor, Lower Left/Right Air Temperature Sensors and Upper Left/Right Temperature Sensors. The Dash Integration Module (DIM) reads inputs from A/C refrigerant low temperature sensor and steering wheel temperature control switch. The DIM controls the Dual Zone Orifice Solenoid and A/C Compressor Clutch. The Powertrain Control Module (PCM) reads inputs from Engine Coolant Temperature Sensor and A/C Pressure Sensor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.