Constant buzzing noise forward of driver seat

[winne2008]

Thought this may help someone else. When the ignition key is turned on or coach started, there is a constant buzzing noise from what appeared to be under the driver side dash. The noise would not stop until the ignition key was turned off.

Turned out to be a vacuum leak under the hood on the firewall. There was a crack in the plastic elbow near the vacuum pump. This caused the vacuum pump to run constantly because the pump could not maintain pressure.

[Party Barge]

My 06 had the same problem with a short piece of rubber hose which had cracked. Took me a little bit to track down leak. I hear it is a common problemm

[shortlance]

Never had that problem but often get an annoying sound or two from the passenger seat.

[Sammie]

Go to post # 23 on this link for pictures.

Pump noise under the hood??

Sammie