Replacing The Electric Air-Conditioning Compressor

Information 

All connection points must be completely clean.

The air-conditioning compressor must be dry (washing the vehicle) and no moisture must get into the air-conditioning compressor and lines.

The connection points must be closed off after they have been opened. Use the original transport caps.

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 information on Work steps for blocked or seized up air-conditioning compressor 

Information 

• New air-conditioning compressors are pressurized and filled with the total oil quantity required 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)! 

Determining oil quantity on the "old" air-conditioning compressor 

1. Unscrew screws -4-  securing air-conditioning compressor -1-  to holder -2-  and remove two-part holder. -2- 

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   Holder on air-conditioning compressor

2. Remove encapsulation -2-  on electric air-conditioning compressor. -1- 

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   Encapsulation on air-conditioning compressor

   1. 2.1 Release encapsulation at the top and bottom. -Arrow A- 
   2. 2.2 Fold out encapsulation -Arrow B-  and remove it.
3. Remove centring sleeve. -3- 

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   Holder on air-conditioning compressor

4. Open the caps on the high-pressure and low-pressure side and relieve pressure from the electric air-conditioning compressor.
5. Fill refrigerant oil from the electric air-conditioning compressor into the measuring cylinder via the connection openings.

The amount of refrigerant oil is referred to as "V _alt " in the formula below.

Determining the refrigerant oil quantity on the "new" electric air-conditioning compressor 

1. To drain refrigerant oil:
   1. 1.1 First open the cap on the high-pressure and low-pressure side and relieve pressure from the electric compressor.
   2. 1.2 Drain refrigerant oil from the electric air-conditioning compressor via the connection openings.

   The refrigerant oil must not be re-used, but must be disposed of in accordance with regulations.

2. To determine the refrigerant oil quantity:
   1. 2.1 V _gesamt = "V _abgesaugt " + "V _alt " + 20 ccm ₃ .
   2. 2.2 V _gesamt = Total volume for the new air-conditioning compressor
   3. 2.3 V _abgesaugt = Total refrigerant oil quantity
   4. 2.4 V _alt = Volume of refrigerant oil in the old electric air-conditioning compressor.
   5. 2.5 20 cm³ = Additional safety charge.
3. Install centring sleeve -3-  in new electric air-conditioning compressor.

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   Holder on air-conditioning compressor

4. Install and lock the encapsulation -2-  on the new electric air-conditioning compressor. -1- 

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   Encapsulation on air-conditioning compressor

5. Install holder -2-  on new electric air-conditioning compressor -1-  and tighten screws -4-  to the prescribed tightening torque. > Tightening torque 20 Nm (15 ftlb.) 

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   Holder on air-conditioning compressor

6. To fill the electric air-conditioning compressor:
   1. 6.1 Fill measured refrigerant oil quantity V_gesamt into the electric air-conditioning compressor.
   2. 6.2 Fill in refrigerant oil via the high-pressure or low-pressure side.
   3. 6.3 Install electric air-conditioning compressor.

      > 873419 REMOVING AND INSTALLING ELECTRIC AIR-CONDITIONING COMPRESSOR