I bought this car last week. I read on the forums that it was the heat pump. But then I read 2018 M3P does not have a heat pump.
When the HVAC is on and in park... I can hear a grumbling noise that smarts off higher pitch but then gets lower and slower. It lasts like 2 seconds.
It sounds like a movie theater subwolfer.
When the HVAC is on and in park... I can hear a grumbling noise that smarts off higher pitch but then gets lower and slower. It lasts like 2 seconds.
It sounds like a movie theater subwolfer.
