My V60 Polestar air con compressor emits a permanent hum when everything is switched off. No idea why, but must use power. Battery drain on that car has been an issue since new. The electrical system on the 2015 era S/XC/V60s seems a bit bizarre; something that stopped us buying an XC40 for a second car that my wife would use.
Bought a Mazda CX30 instead; with a totally gutless 2.0 litre, uneconomical SkyactiveX engine. 35 mpg at best, marketing hype over reality.
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