Contents Wiring diagrams Section: Automatic HVAC System All sections

Automatic A/c-Heater Systems: Other BMW 5 series E39 facelift

Automatic HVAC System 1 illustration ~216 words

Air Conditioning Button

Air conditioning is switched on by push-button located on right side of control panel. (Scheme 8) A/C system will operate only at temperatures greater than 37°F (3°C) with engine on. At least one air outlet must be open when operating A/C system, to prevent evaporator freeze-up.

Blower Control Button

Blower control button allows volume of air entering passenger compartment to be varied. (Scheme 8) Airflow increases as "+" is depressed, and decreases as "-" is depressed. If "-" position is selected at minimum blower speed, all data disappears from display. Blower, heater, and A/C are deactivated, and flow of outside air is switched off.

Recirculated Air Button

Pushing recirculated air button cuts off outside airflow. (Scheme 8)

Temperature Control Button

Temperature control buttons determine temperature of air entering driver's side or passenger's side. (Scheme 8) Pressing lower button will decrease air temperature. Pressing upper button will increase air temperature. Driver and front passenger can select individual temperature ranges.

Residual Heat Button

This system uses warmth stored in the engine to continue heating the interior after ignition is switched off. (Scheme 8) This function can only be activated when ambient (outside) air temperature is less than 59°F (15°C), engine is at operating temperature, and battery is fully charged.

Scheme 8

Scheme 8: Residual Heat Button