System Overview

Many of the components in the Electronic Climate Control (ECC) system are the same as the components used in the manually controlled air conditioning system. The following paragraphs give a brief explanation of components specific to the ECC system.

The ECC system has a rheostat controlled motor (temperature valve motor) to position the temperature door, instead of a temperature control cable as used on manually controlled air conditioning systems.

The ECC system control head has an LCD readout which will display inside
temperature, outside temperature, temperature setting, and diagnostics.

The computerized A/C programmer receives input from several on-vehicle sensors, the CCM, and the ECM, along with temperature and mode requests from the control head. The information input to the programmer is processed and used to control the ECC system.

Three sensors, specific to the ECC system, provide input to the programmer:

^ Outside Air (Ambient) Temperature Sensor: This sensor is located on the right-hand side of the radiator upper support and senses the temperature of the air outside the vehicle.

^ In-Vehicle Temperature Sensor: This aspirator type temperature sensor is located in the air conditioning outlet directly in front of the passenger seat and senses the in-vehicle temperature.

^ Sun Load Sensor: The Sun load sensor is located just under the windshield mounted on the instrument panel grille. This sensor measures the amount of heat generated from the sun shining in the vehicle.