Vehicle: 2015 Porsche Panamera 4 (970), V6-3.6L, Automatic Transmission/Transaxle

Mileage: 123,121 Miles

Problem: The Porsche Panamera’s A/C stopped cooling. The shop diagnosed a leaking condenser. After replacing the condenser and recharging the system to the correct specification, the A/C blew warm air.

The technician confirmed the compressor clutch was not engaging, even though the refrigerant charge level was correct. The A/C control button in the cabin appeared to be disabled. No diagnostic trouble codes (DTCs) were present in the system. After checking for power and finding no clear issue, they sought assistance from ALLDATA Tech-Assist.

Case Details: A Tech-Assist Consultant explained that on this model, the system disables the compressor after a low-charge event, and it must be reset. The technician was instructed to perform a "compressor reset" and a "compressor run-in" procedure using a scan tool and following four diagnostic steps (see below). Diagnostic Steps

1. After A/C service (e.g., condenser replacement), confirm the system is fully charged.
2. If the compressor does not engage, connect a scan tool and access the A/C control module.
3. The system may have disabled the compressor due to a previous low-charge state.
4. Perform the "compressor reset" and "compressor run-in" procedures to re-enable the compressor.

Confirmed Repair: After the technician performed the compressor reset and compressor run-in procedures, the compressor engaged normally and the system blew cold air. Simple fix!