GLS AC Unit Issues

Assessment of automotive cooling systems often presents diagnostic challenges. In your described scenario, a compressor failure coinciding with a stored error code and system inactivity suggests a control unit malfunction may indeed be a likely cause. I encountered a comparable issue with a 2016 Volvo XC90; however, prior to authorizing replacement of the control unit, it is imperative to verify power supply and ground connections to the compressor and control unit. Furthermore, a refrigerant leak test is advisable to exclude low refrigerant pressure as a contributory factor. Have these preliminary checks been conducted?

Thanks for the quick reply. I haven't had a chance to check the power supply and ground connections myself, and a refrigerant leak test wasn't specifically mentioned. The initial diagnosis leaned heavily towards the control unit. Is checking the power supply and ground something I can easily do myself, or is it best left to a workshop with the proper tools?

While basic electrical checks are feasible with a multimeter, a systematic diagnosis necessitates access to wiring diagrams and potentially specialized diagnostic equipment to interpret control unit signals. Considering the presence of a stored error code and the potential for misdiagnosis, proceeding with a qualified workshop may prove more efficient and cost-effective. A refrigerant leak, if present, can exacerbate compressor issues, therefore system integrity should be verified. A dye test is appropriate.

Understood. I appreciate the advice. I'll take it to a workshop and specifically ask them to check the power supply, ground, and for a refrigerant leak before replacing the control unit. Hopefully, it's something less expensive. Thanks again for the insights.