alexander_braun1
XC40 AC Failure
Summary of the thread
The 2022 Volvo XC40's AC system stopped working, displaying an error message and warning light, with no cooling or compressor engagement. Possible causes include a defective AC control unit or electrical fault, rather than low refrigerant. A thorough diagnostic evaluation by a qualified workshop is recommended to pinpoint and resolve the issue.
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4 comment(s)
alexander_braun1 (community.author)
No, there's no sound of the compressor trying to engage, and the engine RPM doesn't change when I press the AC button. If it was just low refrigerant, wouldn't it still try to activate? What if the AC control unit is defective? Has that happened before?
robinlion9
The lack of compressor engagement points away from low refrigerant. A defective AC control unit could be the problem, especially with the error code. Modern HVAC systems are complex, so I'd recommend a qualified workshop for diagnosis and repair. They can pinpoint the cause. The repair might cost around 980€.
alexander_braun1 (community.author)
Thanks for confirming my fears. I'll schedule an appointment with my mechanic to check the AC control unit and do a thorough diagnostic evaluation.
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VOLVO
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XC40
robinlion9
Those symptoms sound troubling, definitely more than a fuse. When you say the AC won't engage, do you hear the compressor clutch trying to kick in? Does the engine RPM change slightly when you press the AC button? It could be a refrigerant issue or a faulty pressure sensor. I'd suggest checking the refrigerant pressure.