I've noticed that after I turn my 2004 F150 Screw 5.4 XLT off that it hisses (air noise) for awhile. It sounds like something is depressurizing. It stops after a couple of minutes.

Is this normal? What is this? I'm thinking it's the AC?

Thanks
Steve

 

Yep, it's the A/C. The high side is bleeding into the low side. Normal as anything.
Chris

 

You must have the Cobra version!HISSSS!Good Luck!

 

bigtexan99,

A/C for sure! My Lariat screw does the same thing, totally normal.

 

Cobra Version!!! Hahahaa, I'm still laughing.