A/C Compressor

A/C Compressor

- After installing a new A/C compressor or fresh refrigerant oil has been filled into compressor, for an example after blowing through the A/C system, turn ribbed belt pulley of A/C compressor 10 rotations by hand before starting the engine. This prevents damage to the A/C compressor

- With 5 cylinder and 10 cylinder diesel engine, rotate A/C compressor 10 turns by hand at pressure relief valve. Then install A/C compressor. This prevents damage to the A/C compressor

• Only start engine after refrigerant circuit has been assembled.

• If possible start engine only with a filled refrigerant circuit.

• A/C compressor is driven permanently by the ribbed belt pulley/torsion elastic clutch not fitted with a magnetic clutch.

• If an A/C compressor locks-up the overload protection for the A/C compressor shaft is triggered. An indication that the A/C compressor has locked-up is deformations/bumps on the ribbed belt pulley/overload protection in front of A/C compressor, but these are not always easy to detect. Another indicator is abraded rubber material in the area of the ribbed belt pulley/overload protection

• The A/C compressor is equipped with a protected oil supply, this prevents A/C compressor damage in the event that the system is empty. This means that approximately 40 to 50 cm3 of refrigerant oil remains in the A/C compressor.

• The engine may only be started when the refrigerant circuit is installed correctly. For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up via internal heat generation so much that the A/C compressor will be damaged.

• A/C Compressor Regulator Valve (N280) is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine.

• If it is necessary to start the engine with a discharged refrigerant circuit:

• Refrigerant circuit must be fully assembled.

• At least 1/4 of the prescribed refrigerant oil must be in the A/C compressor.

• No not rev engine higher than 2000 rpm.

• The engine should run < 10 minutes and the A/C system should be switched off.

- Note the following when starting engine for first time after filling refrigerant circuit:

- Start the engine with the A/C compressor switched off ("Econ " mode or AC "off") and wait until the idling speed stabilizes.

- Open an instrument cluster vent.

- Select temperature preset "Lo" on A/C Control Head (E87).

- Switch the A/C compressor on ("Auto" mode or AC "on") and let it run at least 5 minutes < 1500 RPM with the engine running.