HEATER - Functional description

Functional description

Fan N85 is supplied when the ignition is switched on (INT/A) from the line protected by fuse F31 of the junction unit B2 under the facia and controlled by dedicated fuse F8 of engine bay control unit B1.

Control knob H81 controls the fan at different speeds via regulator O30: the control signal - earth signal - varies according to knob position and crosses or does not cross the coils of regulator O30 to determine four different voltage signals for fan N85, which thus turns at 4 different speeds.

The outside/recirculation air intake flap motor N82 is operated by a special button, located in the control panel H80: the operation of the button sends an earth signal and a supply controlled by the ignition (INT/A) protected by fuse F49 of underfacia control unit B2 which are reversed to reverse the direction of rotation of the motor.