Procedure And General Test Prerequisites

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Information

The safety regulations must be observed during all work on the refrigerant system! → WM 8X00IN SAFETY REGULATIONS FOR WORKING ON AIR-CONDITIONED VEHICLES AND DEALING WITH REFRIGERANT R134A , → WM 8X00IN SAFETY REGULATIONS FOR EXTRACTION AND FILLING SYSTEMS .

Connect the air conditioning service unit. →
Measure outside temperature with a thermometer.
Open all air exhaust nozzles on the dashboard (if necessary direct the blower near the test person).
Insert sensor of the temperature measuring device approx. 4 cm centrally into the left-hand centre nozzle.
Check stopwatch and visual contact with the relevant temperature and pressure on the air conditioning service unit.
Switch on ignition.
Open driver's and passenger's side windows and close sunroof.
Set the temperature for both sides to maximum cooling (LO appears in the display).
Information
- With a 4-zone-air conditioner, the rear air conditioner must also be set to maximum cooling for both sides (LO) (if necessary, use the MONO function) and the rear air exhaust nozzles left open. To activate the MONO function, the [AUTO] -adjusting lever of the front air conditioning control must be pressed longer than two seconds (MONO appears in the display).
Set maximum blower speed.
Start engine and allow to run at idle speed (do not rev engine during or after starting!)
Operate air conditioner for five minutes at idle speed.
Bring engine speed up to 2000 rpm and maintain it there. Start the time measurement immediately.
Note centre nozzle temperature and pressure values after two minutes.
Compare values (centre nozzle temperature and pressure readings) with the specified tolerances.
Information
- If the specified nominal values are not reached, the air conditioning must be checked for leaks and repaired.