Just found this a few days ago. Previous owner capped it with a screw. Anyone know where it is supposed to go? Its the cluster on the passenger side(left hand drive). Same one that joins the 4x4 lines.

 

It's hard to tell where exactly it is located. Is it on the firewall or on the fender? If it's on firewall, it could be going to the Purge Solenoid.

 

I have an 01 and I can't tell where the heck that is ether... We need more of a view elboy...

 

Is it by the battery support

 

Sorry guys.here is more descriptive pic.it's on the passenger side fender below and to the back of the air box.it's the same one that the vacuum lines run through between the 4x4 vacuum solenoids and the cdl actuation hardware.

 

That is a better picture. It is supposed to be like that. It is capped off on mine '01 Limited too. Probably some sort of possible expansion for the future. Leave it as is.

 

Damn! I have intermittently functioning 4wd (flashy light) i was really hoping that may lead me to the issue.