Humming Noise

[mrmemo]

I have a 2013 S 85. For some time now I have been experiencing what I consider excessive battery loss while car is parked over night. I have been losing 10 to 20 miles in a 24 hour period. Has anybody else experienced this or happen to know what the humming noise could be. It sounds like a fan but very faint. I have tried to contact service to no avail.

 

[chronoreverse]

Sounds like the cooling loop. If you're above around 78%, it'll constantly run and your car will likely drain more quickly on idle. Others can probably give you more details.