Cayenne S (9PA) V8-4.5L (2003)
NOTE: Before connecting the high-pressure -3- and low-pressure lines -4- to the vehicle, remove any refrigerant still in the hoses by suction.
a. Let the engine run for a short while with the air-conditioning on, then connect the high-pressure and low-pressure lines of the air-conditioning
unit.
b. Open the valves of the high-pressure and low-pressure lines.
4. Remove refrigerant by suction.
NOTE:
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In the case of service units with transparent oil separator, read and take note of the oil level before removing the refrigerant.
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Do not carry out this step with empty air-conditioning systems (pressure gauge approx. 0 bar), otherwise air will get into the refrigerant bottle.
a. Wait for approx. 2 minutes after the service unit has switched itself off. If the pressure gauge reading rises above 0 bar, repeat the suction
process.
NOTE: In the case of cold vehicles, 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.
b. Drain the extracted refrigerant oil into a measuring cup on the service unit and determine the volume.
5. Carry out repairs.
NOTE:
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The vehicle air-conditioning system is now completely empty. Necessary repairs, such as removing and fitting the dryer, can now be carried
out.
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The open air-conditioning system should not be left open unnecessarily, but must be closed again as quickly as possible after being opened.
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If the air-conditioning system has been open for a long time, a new dryer must be fitted.
a. If necessary, reconnect high-pressure and low-pressure lines.
6. Evacuate the system and check it for leaks.
a. Using the service unit, evacuate the system for 5 - 10 minutes.
b. Observe the pressure gauge for approx. 2 minutes. If the pressure rises, air is entering the vehicle air-conditioning system. The leak must be
located and repaired. If the pressure remains constant, add refrigerant oil.
7. Add refrigerant oil.
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In the case of units without oil filling system:
Start the vacuum pump. At the start of this vacuum phase, add the measured quantity of refrigerant oil using an oil injector or a hose
disconnected from the service unit. Reconnect the hose to the service unit immediately after adding the oil.
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In the case of units with oil filling system:
Add the measured quantity of refrigerant oil and wait for it to be taken in.
NOTE: Do not allow any air to be taken in, otherwise point 6 must be repeated.
8. Evacuate.
NOTE:
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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.
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If the air-conditioning system has been open for a long time, evacuation can be carried out for up to 120 minutes.
a. In the case of units with fitted oil filling system, add refrigerant oil now.