Warning Notes For Handling Refrigerant

Information 

• The refrigerant R1234yf with refrigerant oil ND12 is used for the model year 2017 Cayenne. 
• Only the refrigerant oil ND12 can be used for the refrigerant R1234yf. 
• The refrigerant R134a is also available for certain markets and only the refrigerant oil ND8 can be used for this as well. 
• The allocation of refrigerant to the vehicle is controlled using the additional equipment number (M-number) and the allocation of refrigerant and the refrigerant quantity can also be found on the sticker in the engine compartment. 
• Read the relevant safety data sheet for handling refrigerant R134a and R1234yf. 

Information 

• For all work on the air-conditioning system that necessitates opening the refrigerant system, the system contents must first be disposed of in accordance with regulations. 
• Dirt and moisture must be kept out of the air-conditioning system pipes and hoses. 
• Cleanliness must be ensured during all work. 
• System components must never be cleaned on the inside with hot steam. 
• Only use nitrogen for cleaning. 
• When replacing a component, all openings must be closed off using suitable stoppers immediately after opening the system. 

Information 

• Instructions in the operating instructions for the air-conditioning servicing equipment take precedence. The procedure described here may differ from the description provided by the respective air-conditioning servicing equipment manufacturer. 

Information 

• If a flushed refrigerant circuit will not be assembled again immediately after flushing, leave the adapters on the connections and close off the connections on the adapters using > VAS 6338/30A - sealing caps . 

Information 

The electric air-conditioning compressor must be cleaned in the following situations:

• If different refrigerant oil must be used. 
• Following an accident resulting in damage to air conditioning components 
• Refrigerant circuit has been open for an indefinite period of time and is not closed off properly. 
• In order to determine the refrigerant oil quantity. 

Information 

• The refrigerant oil in the electric air-conditioning compressor must be removed by flushing in direction of flow (from intake on low-pressure side to outlet on high-pressure side). It is not possible to flush against the direction of flow due to the installed valves. 
• In order to flush the air-conditioning compressor, it must be positioned so that the connection for the refrigerant line on the high-pressure side is as low as possible. 
• If air-conditioning servicing equipment without programming is used for flushing, the procedure must be performed manually (evacuate, flush 4 times using at least 2 kg of refrigerant each time and extract the refrigerant again, evacuate). 

1. Basic circuit diagram (flushing circuit) for cleaning with refrigerant 

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Basic circuit diagram (flushing circuit) for cleaning the electric air-conditioning compressor

   1	Air-conditioning servicing equipment (with flushing device)
   2	High-pressure hose on air-conditioning servicing equipment
   3	Adapter for connection for the low-pressure side on the air-conditioning compressor
   4	Refrigerant line
   5	Electric air-conditioning compressor
   6	Refrigerant line
   7	Adapter for connection for the high-pressure side on the air-conditioning compressor
   8	Hose on flushing device
   9	Flushing device for refrigerant circuit
   10	Low-pressure hose on air-conditioning servicing equipment

2. Secure adapters -7-  VAS 6338/40 to the high-pressure side (small diameter) and -3- VAS 6338/41  to the low-pressure side (large diameter) using the screws used to secure the refrigerant line to the electric air-conditioning compressor -5-  . Use the same tightening torque as for securing refrigerant lines to air-conditioning compressor.
3. Connect high-pressure hose -2-  of the air-conditioning servicing equipment (generally red) to the adapter -3-  on the electric air-conditioning compressor.
   1. 3.1 To do this, the quick connector on the high-pressure line of the air-conditioning servicing equipment must be removed.
4. Connect low-pressure hose -10-  of the air-conditioning servicing equipment (generally blue) to the outlet of the flushing device (chip filter) -9-  for refrigerant circuits using the quick connector.
5. Connect hose on the flushing device -8-  of the air-conditioning servicing equipment to the adapter -7-  on the electric air-conditioning compressor.
6. Clean the refrigerant circuit as described in the operating instructions for the air-conditioning servicing equipment.
7. After flushing, check the pressure in the refrigerant circuit. There must be no overpressure in the refrigerant circuit (evacuate the refrigerant circuit again briefly if necessary).
8. Take into account the amount of refrigerant oil extracted from the electric air-conditioning compressor when filling the refrigerant circuit.