antoniakeller4

S90 AC compressor not engaging

A/C not working on my 2019 Volvo S90 diesel. Compressor isn't engaging, and the system isn't cooling. There's a fault stored in the error memory. Any ideas?

The A/C compressor on a 2019 Volvo S90 diesel was not engaging, leading to a lack of cooling. The issue was traced to a fault stored in the error memory, with undervoltage identified as a potential cause. It was suggested to check the pressure sensor or relay switch. After a workshop inspection, the problem was confirmed to be undervoltage, and a faulty relay switch was replaced, resolving the issue.

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4 comment(s)

I had a similar problem with my S90. Have you checked the voltage? Undervoltage can cause the A/C compressor to shut off. Check the pressure sensor or relay switch.

Thanks. Could you explain how undervoltage could cause this? And were the symptoms the same with your car?

Yes, same symptoms. The A/C stopped working completely. With undervoltage, the compressor might not get enough power to engage. I'd suggest having it checked at a workshop.

Thanks for the advice. The workshop confirmed it was undervoltage. The repair, including checking the HVAC system and replacing a faulty relay switch, cost 240€. The A/C is now working.

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VOLVO

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S90