[4x4]

First thread/post! Have a 2001 CC F350. Usually when it is cold, but I think it did it today when warm, there is a clunk that can be heard and felt shortly after I start the engine. Seems to come from passenger side engine compartment. Any help would be greatly appreciated.

Steve

 

[yobuda]

First thread/post! Have a 2001 CC F350. Usually when it is cold, but I think it did it today when warm, there is a clunk that can be heard and felt shortly after I start the engine. Seems to come from passenger side engine compartment. Any help would be greatly appreciated.

Steve

Sounds like your blend door for your heat/AC moving back to position. After shut down, when the vacuum bleeds off, the door will move. After vacuum is restored, it jumps back to the position set from the cab.

 

[4x4]

Thank you. One down.

 

[DcMoore999]

Yea sounds about right mine used to do that alot, then i changed my vacuum because it was worn out and it doesn't do it as much now....i'm not saying change your pump its not hurting anything.

 

[Arisley]

:stupid: What he said.

 

[BDRUMMONDS]

Could also be the EBP valve it cycles once every time the truck is started. usually about 5-10 seconds after start up.