I was doing a 180,000 mile tune-up on my 98 Ranger 2.5L. When working on the passenger side plugs, I noticed when I got finished I had broken a plastic vacuum line. It is a gray line that runs through molded clips on the side of the evaporator box and appears to go through the bottom of the box into the cab, but I didn't look underneath. The other end of the plastic vacuum line goes to the fitting on the heater control valve. I thought at first it was an EVAP line, but I knew that would have immediately triggered an ENGINE light, which it did not. Now I know since it was connected to the heater control valve it must be to open the heater control doors on the box. Anyone know specifically which line I just broke and how impossible it will be to change it? I looked in the factory Ford manual and couldn't locate it where it runs. Hopefully someone here has had to replace it. Anyone know of pricing?

 

Hard to say from here, but it might be simpler to cut the line & splice the 2 halves back together with a slightly bigger piece of rubber hose.