Troubleshooting The Air Conditioning System Following Complaints About Cooling Output

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

Information

The troubleshooting steps shown must be used if complaints are received about the cooling output of the air-conditioning system.

→ INSTRUCTIONS FOR REPAIRING AIR-CONDITIONING SYSTEMS AND STORING SPARE PARTS

Information

If it is not possible to clearly detect a leak using a leak detector, then only the leak detector additive supplied by SPEKTRONICS may be used. Leak detector additive: Traserline TP 3860 in dissolved form.

This leak detector additive is available from service equipment providers (e.g. Waeco).

For filling this Traser additive, special adapter kits are required, which are also available from service equipment providers (e.g. Waeco).

Information on how to use the air-conditioning system and the procedure for filling it can be found in the operating instructions for the adapter kits.

Status	Specification OK	Specification not OK
1) Check the cooling output, temperature and air flow. Check the air distribution by making adjustments to the air-conditioning control panel. Start the vehicle and check the air conditioning system for the prescribed nominal temperature values. → WM 8701IN NOMINAL VALUES FOR PRESSURES AND TEMPERATURES	Specified air flow and temperature is reached. Air distribution is working. Continue with Step 2) .	Insufficient air flow from the exhaust vents. Continue with Step 3) . Required temperature is not reached. Continue with Step 2) .
2) Perform on-board diagnosis on all control units. PIWIS Tester II 9818	No fault memory stored, air flow and temperature complies with specified nominal values. Function OK. No further action required. No fault memory stored and the temperature does not reach the specified nominal values. Continue with Step 4) .	Fault present: Work through fault memory in accordance with "Guided Fault Finding". Continue with Step 1) .
3) Check the following points one after the other. Replace if necessary. Remove active carbon/particle filter and check for dirt and dust particles. → REMOVING PARTICLE FILTER Check fan motor for correct operation and control. Use wiring diagram if necessary.	Fan motor and active carbon filter OK. Continue with Step 4) .	Replace active carbon/particle filter if necessary. Check mechanical operation (air distribution) of the servo motors/flaps and repair them if necessary, e.g. → Removing Servo Motor For Central Distributor Flap Following repairs, continue with Step 1) .
4) Connect air-conditioning service device, measure high and low pressure and compare with nominal values. → WM 8701IN NOMINAL VALUES FOR PRESSURES AND TEMPERATURES	High and low pressure OK. Function OK. No further action required.	High pressure too high, continue with Step 5) . High pressure too low, continue with Step 6) . Low pressure too high, continue with Step 7) . Low pressure too low, continue with Step 8) .
5) High pressure too high. Check the following points one after the other: Check condenser for dirt/dust particles and damage. Check electrical operation, condenser fan activation. Drain refrigerant, measure and document the amount of refrigerant removed. >> Too much refrigerant. → WM 870317 DRAINING AND FILLING IN REFRIGERANT		Clean the condenser. Repair condenser fan activation mechanism. Use wiring diagram. Fill the air conditioning system with the prescribed amount of refrigerant. → Technical Data For Air-Conditioning System Continue with Step 1) .
6) High pressure too low. Check the following points one after the other: Check electrical operation, air conditioning compressor activation. Drain refrigerant, measure and document the amount of refrigerant.	>> If the amount of refrigerant is correct, remove the expansion valve and check for foreign bodies (e.g. chips, abrasion). → WM 877019 REMOVING AND INSTALLING EXPANSION VALVE WM 870317 DRAINING AND FILLING IN REFRIGERANT Replace expansion valve if necessary. Continue with Step 1)	Repair air-conditioning compressor activation mechanism. Use wiring diagram. >> If there is not enough refrigerant, fill the air conditioning system according to specifications.→ WM 8700IN TECHNICAL DATA, AIR-CONDITIONING SYSTEM Check refrigerant circuit and connection points using a leak detector. >> Once you have determined the cause of refrigerant loss, replace seal or spare part. Continue with Step 1)
7) Low pressure too high. Check the following points one after the other: Drain refrigerant, measure and document the amount of refrigerant. >> Too much refrigerant. → WM 870317 DRAINING AND FILLING IN REFRIGERANT	If the amount of refrigerant is correct, remove the expansion valve and check for foreign bodies (e.g. chips, abrasion). → Removing Expansion Valve Draining And Filling In Refrigerant Replace expansion valve if necessary. Continue with Step 1)	>> If there is too much refrigerant, fill the air conditioning system according to specifications.→ WM 8700IN TECHNICAL DATA, AIR-CONDITIONING SYSTEM Continue with Step 1)
8) Low pressure too low. Check the following points one after the other: Drain refrigerant and measure the amount of refrigerant. >> Not enough refrigerant. → WM 870317 DRAINING AND FILLING IN REFRIGERANT Loosen lines on the air conditioning compressor and check for foreign bodies (e.g. chips, abrasion). → Removing Air-Conditioning Compressor	If the amount of refrigerant is correct, remove the expansion valve and check for foreign bodies (e.g. chips, abrasion). → Removing Expansion Valve WM 870317 DRAINING AND FILLING IN REFRIGERANT Replace expansion valve if necessary. Continue with Step 1)	Fill the air conditioning system with the prescribed amount of refrigerant. → WM 8700IN TECHNICAL DATA, AIR-CONDITIONING SYSTEM Check refrigerant circuit and connection points using a leak detector. >> Once you have determined the cause of refrigerant loss, replace seal or spare part. Replace air conditioning compressor if necessary. Continue with Step 1)