General Installation Sequence

Information

On air-conditioning service equipment with a transparent oil separator, read off and take note of the oil level before removing refrigerant.
Do not carry out this step on empty air-conditioning systems (pressure gauge approx. 0 bar) because if you do, air will get into the refrigerant bottle.
If the vehicle is cold, it may be necessary to repeat the suction procedure until all refrigerant has been removed from the air-conditioning system. This step is carried out automatically with some units.
Charging valves are located in the technical equipment space at the right in direction of travel.

Screw off protection caps -1 and 2- on the charging valves.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Protection caps on charging valves

Before connecting the high-pressure and low-pressure lines to the vehicle, remove any refrigerant remaining in the filler hoses of the air-conditioning servicing unit by suction.
Connect both filler hoses from the air-conditioning servicing unit.
1. 2.1 Open the valves on the filler hoses.
Perform routine for draining refrigerant using the PIWIS Tester.
1. 3.1 Connect the PIWIS Tester to the vehicle and switch on the PIWIS Tester.
  Information
  
  The terms "Ignition on" and "Starting engine" are re-defined for fully electric vehicles (battery electric vehicles - BEV).
  
  Establishing operational readiness/Ignition on:
  
  Prerequisites for establishing operational readiness: High-voltage battery is sufficiently charged, remove vehicle charging cable from the vehicle charge port, put driver's key in the emergency start tray.
  
  Establishing operational readiness automatically: Get into the vehicle and close the driver's door. The driver's key is recognized inside the vehicle. Operational readiness is established.
  
  Establishing operational readiness manually: Press Start/Stop switch. The driver's key is recognized inside the vehicle. Operational readiness is established.
  
  Establishing operational readiness/Starting engine:
  
  Establish operational readiness and engage transmission range. The vehicle is now ready to drive and can be moved.
  
  Ending operational readiness/Switching off ignition
  
  Ending operational readiness automatically: Get out of the vehicle with the driver's key and close the driver door. The driver's key is no longer detected outside the vehicle. Operational readiness ends.
  
  Ending operational readiness manually: Press Start/Stop switch until the instrument cluster is switched off.
  
  Ending driving readiness/Stopping engine
  
  Vehicle is stationary: Press the P button on the instrument cluster. The vehicle is parked.
2. 3.2 Establishing operational readiness/Ignition on:
3. 3.3 Start diagnostics.
4. 3.4 Select Thermal management control unit .
5. 3.5 Select Maintenance/repairs tab
6. 3.6 Select the menu item Drain and fill refrigerant circuit and press F12 to continue.
7. 3.7 Select ACTIVATE the mode for draining and filling the refrigerant and press F8 to start.
8. 3.8 Follow the instructions on the PIWIS Tester.
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.
Remove refrigerant by suction.
Carry out repairs.
1. 5.1 The open air-conditioning system must not be left open unnecessarily, but must be closed off using suitable stoppers immediately after being opened.
  Information
  
  The desiccator must be replaced in the following situations:
  - Refrigerant circuit is open for > 20 minutes.
  - Amount of refrigerant extracted is < 30% of the required quantity.
  - Refrigerant circuit has been open for an indefinite period of time (gradual leak, stone damage to condenser).
  - Air-conditioning compressor has become blocked.
  - Dryer cartridge is damaged.
  - After opening the packaging and line connections (on a new desiccator), the desiccator must be installed within 20 minutes at the latest and the refrigerant circuit must be closed, evacuated and filled.
    The desiccator must not be replaced in the following situations:
  - If the components are closed off using stoppers immediately after opening the refrigerant circuit or if the refrigerant circuit is closed and evacuated within 20 minutes at the latest.
2. 5.2 Before closing off the refrigerant circuit, check whether the dryer needs to be replaced.
Evacuate the system and check for leaks.
1. 6.1 If the air-conditioning system has been opened, evacuation should last at least 20 minutes so that the moisture can evaporate and be removed by suction.
Fill the air-conditioning system.
1. 7.1 Select the refrigerant quantity according to specifications from the technical data or the data on the sticker on the vehicle.
  > 8X00IN TECHNICAL DATA FOR AIR-CONDITIONING SYSTEM WITH R134A AND R1234YF
  NOTE:
  Excessively high pressure in refrigerant circuit
  - Risk of damage to air-conditioning compressor
    → Do not allow low-pressure gauge to go above 3 bar.
2. 7.2
Perform routine for filling refrigerant using the PIWIS Tester.
1. 8.1 Connect the PIWIS Tester to the vehicle and switch on the PIWIS Tester.
  Information
  
  The terms "Ignition on" and "Starting engine" are re-defined for fully electric vehicles (battery electric vehicles - BEV).
  
  Establishing operational readiness/Ignition on:
  
  Prerequisites for establishing operational readiness: High-voltage battery is sufficiently charged, remove vehicle charging cable from the vehicle charge port, put driver's key in the emergency start tray.
  
  Establishing operational readiness automatically: Get into the vehicle and close the driver's door. The driver's key is recognized inside the vehicle. Operational readiness is established.
  
  Establishing operational readiness manually: Press Start/Stop switch. The driver's key is recognized inside the vehicle. Operational readiness is established.
  
  Establishing operational readiness/Starting engine:
  
  Establish operational readiness and engage transmission range. The vehicle is now ready to drive and can be moved.
  
  Ending operational readiness/Switching off ignition
  
  Ending operational readiness automatically: Get out of the vehicle with the driver's key and close the driver door. The driver's key is no longer detected outside the vehicle. Operational readiness ends.
  
  Ending operational readiness manually: Press Start/Stop switch until the instrument cluster is switched off.
  
  Ending driving readiness/Stopping engine
  
  Vehicle is stationary: Press the P button on the instrument cluster. The vehicle is parked.
2. 8.2 Establishing operational readiness/Ignition on:
3. 8.3 Start diagnostics.
4. 8.4 Select Thermal management control unit .
5. 8.5 Select Maintenance/repairs tab
6. 8.6 Select the menu item Drain and fill refrigerant circuit and press F12 to continue.
7. 8.7 Select Draining and filling refrigerant mode END and press F F8 start.
8. 8.8 Follow the instructions on the PIWIS Tester.
Add refrigerant from both filler hoses to the air-conditioning system in the vehicle.
1. 9.1 The refrigerant quantity in the filler hoses is part of the filling capacity for the air-conditioning system in the vehicle.
2. 9.2 Close the valves on the filler hoses and disconnect them from the vehicle.
Information
- After filling the air-conditioning system, the valve on the high-pressure and low-pressure connection must be checked using a leak detector.
- The protection caps must not be fitted.
- Position the leak detector at a specified distance (see operating instructions for each leak detector) above the valves and check the valves for signs of any leaks.
Check that the charging valves are leak-tight using a leak detector.
If there are no leaks in the high-pressure and low-pressure connection charging valves, fit the protection caps. -1 and 2-

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Protection caps on charging valves