Replacing Electric Air-Conditioning Compressor

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Information 

• If the air-conditioning compressor is blocked or seized up, then additional steps must be carried out to ensure that the air-conditioning system is working. See section on WORK STEPS FOR BLOCKED OR SEIZED UP AIR-CONDITIONING COMPRESSOR 

Information 

• New air-conditioning compressors are pressurized and filled with the required amount of oil for the refrigerant circuit  .
• The remaining oil quantity in the individual components must therefore be taken into account! 
• Refrigerant oil from the compressor or refrigerant oil removed by suction from a previously run air-conditioning system may no longer be used (special-category waste)! 

1. Unscrew M8 fastening screw -11-  used to secure the low-pressure refrigerant line -4-  to the electric air-conditioning compressor.
   1. 1.1. Replace O-ring on low-pressure refrigerant line and coat it with refrigerant oil.
   2. 1.2. Tighten fastening screw -11-  used to secure the low-pressure refrigerant line -4-  to the electric air-conditioning compressor to the prescribed tightening torque. Tightening torque 20 Nm (15 ftlb.) +/-3 Nm (+/-2 ftlb.) 
      Fig 1: Identifying Low-Pressure Air-Conditioning Line On Air-Conditioning Compressor

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Open the cap on the high-pressure side and relieve the pressure from the air-conditioning compressor.
3. Open the oil filler screw on the air-conditioning compressor.
4. Drain approx. 70 cm³ of refrigerant oil out of the air-conditioning compressor and into a measuring glass. The remaining quantity of oil (approx. 80 cm³ ) remains in the air-conditioning compressor.
5. Always replace the sealing ring for the oil filler screw.
6. Use fastening screws from the new air-conditioning compressor. Replace O-rings and coat new O-rings with refrigerant oil.
7. Tighten oil filler screw to the prescribed tightening torque. Tightening torque 26 Nm (19 ftlb.)