Lubricating the air conditioning compressor (coolant oil level in new air conditioning compressor is known)

• Step 1 
• Read and note the coolant oil level specification on the removed air conditioning compressor.

  (If there is no sticker, continue with step 2 and 3.  )

• Read and note the coolant oil level specification from the new air-conditioning compressor.
• Compare both amounts of coolant oil with each other:

Different cases: 

• Coolant oil level specification on the removed and new air conditioning compressor is the same  . In this case, continue with step 4, case 1  .
• Coolant oil level specification on the removed and new air conditioning compressor is not the same: 

Different cases: 

• The coolant oil level specification on the removed air conditioning compressor is higher  than that on the new air conditioning compressor. The difference is not taken into account. In this case, continue with step 4, case 1. 
• The coolant oil level specification on the removed air conditioning compressor is lower  than that on the new air conditioning compressor: Take the difference of both amounts of coolant oil and note. Then continue with step 4 case 2. 

Example: 

Coolant oil level specification on removed  air conditioning compressor 110 g

Coolant oil level specification of new  air conditioning compressor 150 g

150 g - 110 g = 40 g correspond to almost 40 ml

Note difference of 40 ml.

• Step 2 
• Mechanical air conditioning compressor (removed): 
• Open the oil filler plug.
• Drain the refrigerant oil remaining in the removed  air conditioning compressor fully into a measuring cup by means of the oil filler plug.
• Turn the belt pulley while draining.
• EKK with an oil filler plug (removed): 
• Open the oil filler plug.

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• Drain the refrigerant oil remaining in the removed  air conditioning compressor fully into a measuring cup by means of the oil filler plug.
• EKK without an oil filler plug (removed): 
• Remove the dummy plugs from the high-pressure connection and the low pressure connection.

• Drain the refrigerant oil remaining in the removed  air conditioning compressor fully into a measuring cup by means of the high-pressure connection and low pressure connection. 
• Step 3 
• Examine the refrigerant oil drained from the removed air conditioning compressor in the measuring beaker. 

  If no refrigerant oil emerges from the removed air conditioning compressor, examine the suctioned refrigerant oil in the collecting vessel of the A/C service station. 

• There are no shavings in the drained refrigerant oil.

  No additional work necessary.

• There are shavings in the drained refrigerant oil.

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In addition to the air conditioning compressor, replace the following parts:

• Air conditioning condenser
• Desiccant insert (if exchangeable individually, if not air conditioning condenser)
• Line to the air conditioning condenser
• Refrigerant oil
• All expansion valves
• Battery Electric Vehicle, Plug-in Hybrid Electric Vehicle: Additionally, flush the refrigerant circuit.

• Step 4 
• Read the coolant oil level drained from the removed air conditioning compressor on the measuring cup.

  Case 1: 

• Add 10 ml  to the coolant oil level recorded as a precautionary allowance. 
• Note at least but a total of 50 ml. 

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Example: 

20 ml read at measuring cup:

20 ml + 10 ml precautionary allowance = 30 ml < 50 ml

determined coolant oil level in the new air conditioning compressor = 50 ml

Case 2: 

• Add 10 ml  to the coolant oil level recorded as a precautionary allowance. 
• Add the difference to that. 
• Note at least but a total of 50 ml. 

Example: 

Difference = 40 ml

20 ml read at measuring cup:

20 ml + 10 ml precautionary allowance = 30 ml

30 ml + 40 ml difference = 70 ml > 50 ml

determined coolant oil level of new air conditioning compressor = 70 ml

• Step 5 
• Mechanical air conditioning compressor and EKK with an oil filler plug (new): 
• Open the oil filler plug.
• Drain the coolant oil level indicated in the table from the new  air conditioning compressor into a clean measuring cup by means of the oil filler plug.
• EKK without an oil filler plug (new): 
• Remove the blind plug from the high-pressure connection.
• Drain the coolant oil level indicated in the table from the new  air conditioning compressor into a clean measuring cup by means of the high-pressure connection. 

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Coolant oil level to be drained from the new air conditioning compressor = coolant oil level on the label for the new air conditioning compressor - coolant oil level to be determined in the new air conditioning compressor

Example: 

Amount on the new air conditioning compressor coolant oil label: 150 ml determined coolant oil level of new air conditioning compressor: 50 ml

Coolant oil level to be drained = 150 ml - 50 ml = 100 ml

100 ml must be drained from the new  air conditioning compressor

• Mechanical air conditioning compressor and EKK with an oil filler plug (new): 
• Replace the sealing ring.
• Tighten oil filler plug.
• EKK without an oil filler plug (removed): 
• Seal the high-pressure connection with a dummy plug.
• Fill the drained, new refrigerant oil immediately after draining into the storage tank of the A/C service station.
• Properly dispose of drained, new refrigerant oil if it was not immediately filled into the storage tank of the A/C service station.
• Drained refrigerant oil from the previous air conditioning compressor must not be reused and must be correctly disposed of.