From what I've garnered the failed motor bearing is pretty loud. My '13 (same color as yours BTW) makes the same inverter whine below about 10-15 mph, louder when braking or in L (more regen being produced). I also hear a slight whine when starting out. Typical of AC drive systems. Be sure the electric heat works! Mine's always been fine, but others have had issues. You can visit any GM dealer and have them run a VIN check to see if all recalls and TSB's have been done. There's only a few. I've refused to have the "unintentional engine running" one done, as, IMHO, it's more of a nuisance than a fix, and I like to be able to lock my car with it on when I run into the store for a minute, or get out to check the mail. Welcome to the forum! Volts are great cars.