My 2008 HHR is making a our humming noise from the engine compartment. It's only in gear when it hums and the humming gets louder as the engine rpms go up .when I brake the humming stops.
PLEASE HELP AND THANKS IN ADVANCE!!

 

Does it get louder with increased vehicle speed, or with engine RPM?

 

Yes it does

 

No, not yes. Which one?

 

Yes it gets louder the humming noise

 

Please read the question again.

 

The humming noise gets louder with engine speed

 

Ok, so we can rule out driveshafts, hubs, and brakes.

Can you post a recording of the sound?

 

Yesi will provide audio sometime today and thanks for the help I really appreciate it.

 

Humming noise can be flex pipe, timing chain or it just doesn’t know the words to the song !