heater control valve vacuum line

[andyman793]

Quick question on my 98 5.0L ex... I have heat and lots of it. Found the vacuum line to the heater control valve goes nowhere, so guessing that is my problem. Where should the line be connected to? Currently it's dangling and I couldn't find the other end.

 

[koda2000]

it's supposed to go to the control valve and the other end should "T" into one of the existing vacuum lines. which end is dangling? i believe, w/out vacuum the valve should remain closed and you shouldn't be getting hot water into the heater core.