Operation

OPERATION





In order to start operating the refrigerant compressor, the heater A/C control module actuates the electromagnetic clutch and the solenoid (5) is supplied with electrical current. The magnetic force attracts the pressure plate (6) against the rubber insert (7) and holds it securely. This creates the connection between the engine and the compressor. If the solenoid (5) is de-energized, then the pressure plate (6) is pressed back by the rubber insert (7) into its rest position and the connection is interrupted.

The clutch also preforms a safety shutoff of the compressor. To prevent a mechanical defect in the compressor from causing the accessory drive belt to jump loose, the electromagnetic clutch releases itself automatically. With a mechanical defect, the compressor rotates more sluggishly or even locks completely. The heat generated at the friction surface causes the melting fuse (2) in the solenoid (5) to melt. The current supply to the solenoid (5) is interrupted and the frictional connection is released.

The A/C compressor clutch is not serviced separately. The A/C compressor clutch must be replaced as a unit with the A/C compressor.