Hello. I’ve got a noise I’m trying to diagnose on our 2010 Cobalt. Thought I’d ask about it here before heading to a mechanic.
When I hit about 35 mph I start to hear a hum sound that we’ve never heard before (my wife says she can here it at slower speeds, but I can’t).
The sound gets higher in pitch as the car speed increases. The RPMs don’t affect it (i.e. when the car shifts gears, no change in the sound).
If I shift into neutral and take my foot off the gas, the sound doesn’t change (except dropping in pitch as I slow down).
Seems to be tied entirely to the speed of the car, not related to RPMs, throttle, etc.