Control Components

The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. The function selector position determines heating or cooling and air distribution. The temperature blend control setting determines air temperature.

The manual climate control components are used to:
^ Select the air inlet source (outside or recirculated).
^ Select the blower motor speed.
^ Select the discharge air (temperature blend).
^ Select discharge air location (defrost, panel, floor).
^ Select the A/C compressor clutch operation.

The climate control assembly has three control systems:
^ The A/C heater function selector switch combines a vacuum selector valve for direct control of the vacuum control motors and electrical input to the instrument cluster module.
^ The temperature selection is accomplished with a potentiometer connected to the electric blend door actuator that controls positioning of the temperature blend door. Movement of the control knob from COOL (blue) to WARM (red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
^ The blower motor switch controls the blower motor speed through a series of resistors and a relay.