Generation 1 Chevy Volt (2011-2015)
Gen 1 Ampera/Volt 2015/32k miles
When I press the power button, a loud hum starts about 3 seconds after. It stops if I either set the cabin heater Blower fan to 'OFF' or reduce the temperature to 'LOW'. Local Ampera (it's a UK car) Service agent changed the cabin blower motor fan (under the...