Compressor HVAC: Service and Repair

A/C Compressor

Special tools, testers and auxiliary items required

• Torque Wrench (V.A.G 1331) (5 to 50 Nm)

• Robinair A/C Service Unit (ROB 134APF) with Rinsing Device For Refrigerant Circuits (VAS6337/1) /1A

Removing

• Flush the refrigerant circuit with R134a refrigerant under the following conditions:

• In the event of dirt or other contamination in the refrigerant circuit.

• If vacuum reading is not maintained on evacuating a leak-free refrigerant circuit (pressure build-up due to moisture in refrigerant circuit).

• If refrigerant circuit has been left open for longer than normal (for example, following an accident).

• If pressure and temperature measurements in the refrigerant circuit indicate the likelihood of moisture

• In the event of doubt about the amount of refrigerant oil in the circuit.

• The A/C compressor had to be replaced on account of internal damage (such as noise or no output).

The procedure for flushing with R134a refrigerant is described.

Information for repairing vehicles with air conditioning and working with refrigerant can be found.

Information for special tools and equipment when repairing vehicles with air conditioning can be found.

- Extract refrigerant using (ROB 134APF) , only then open the refrigerant circuit. See notes, refer to => [ Refrigerant Circuit Components ] Refrigerant Circuit Components.






- Remove the noise insulation under the engine.

• Depending on the engine installed, remove the charge air hose.

- Remove the ribbed belt.

- Disconnect the connector from the A/C compressor regulator valve (N280).


There is a danger of ice-up.

Refrigerant leaks out if refrigerant circuit is not discharged.

Refrigerant must be extracted before opening the refrigerant circuit. If refrigerant circuit is not opened within 10 minutes of extraction, pressure may form in refrigerant circuit due to evaporation. Extract refrigerant once more.

- Remove the bolts (22 Nm ± 1 Nm) - 1 - from the A/C compressor and then disconnect the refrigerant pipes from the A/C compressor.

- Remove the hex bolts (25 Nm) - 2 - and the A/C compressor.

Installing

• Make sure alignment bushings - 3 - are seated correctly.

• Pay attention to notes for installing A/C compressor. Refer to => [ A/C Compressor Installation Information ] Description and Operation.