I HAVE BEEN HEARING A NOISE FROM THE FRONT END ...
2004 Ford F-150
January, 10, 2013 AT 5:07 PM
I have been hearing a noise from the front end like the 4x4 is trying to engage without me hitting the switch. I discovered that one of the vacuum lines has been disconnected at the check valve. Are there any vacuum routing diagrams for the 4x4 system out there?