I bought a used 96 f250 and noticed that there is a broken yellow tube, about 1/8" diam coming from what I believe is the HVAC Defrost Mode Door Actuator.

My AC and climate controls are coming out of my regular vents at the moment, but this line would affect defrost, right?

1. Should I immediately fix the line? Will it affect the whole vacuum system?
2. Where can I get a new line? I couldn't find it on parts geek.

 

ASSUMING there were no significant changes from 1994 to 1996 (and there probably wasn't in climate control stuff)...

1994 EVTM shows a Yellow hose running from the climate control panel's hose connector to the "Floor-Defrost Door Vacuum Motor". This one is a dual-position vac motor, has a Blue hose on it, too.
It shows the Yellow hose having vacuum on it on all k-n-o-b positions except DEFROST. So yes, there is a vac leak.

Find some thinner-wall vac hose at parts store, after you physically see where the other end needs to hook up to, to see what inside diameter you need to fit either snuggly OVER the Yellow, or a smaller diameter hose to totally replace the Yellow. Clip off a piece of Yellow and take it with you as a guide.

Wonder if somebody's foot snagged it, or someone (or something? ) has been under there. I ain't gonna look, I don't wanna know

 

Thanks. I can see both ends, so hopefully I can slip something over,( or splice and tape?)

Maybe it broke when the previous owner put the tire iron and jack right there?

 

Oh no, that's not Yellow, it's faded/decayed White! I thought you were under the dash!

That broken White hardline is real common. It feeds the Recirculate/Fresh air door. The Recirc door opens by the passengers feet, and it close the outside cowl air intake.

I suggest unwrapping the wiring harness it comes out of, far enough in to find solid hardline, otherwise it will break again. I had to go in a few inches on my Bronco.

Now... can you stick the jack and tools under the dash?

Looks like your jack clamp is missing the wing nut and stud, that holds it and the jack tightly to the inner fender there.

Snip off a maybe 1" long piece of good hardline to use as a sample to get a vac hose that will fit over it snuggly.

 

I can probably stick two full people under that truck's dash.

The line seems brittle, but there's a good amount still sticking out, I think I can patch it.

So without that line, is it on recirc or fresh?

And is the whole vacuum system hurting because of that small leak?

 

It has vac on it in "MAX".

I don't remember which way, but with engine running if you put it to MAX A/C, and the door at passenger's feet is still closed, then it needed vac for Recirculate. Around here, we NEED Recirculate!!!

 

Well this should be easy compared to the next few fixes. I'll be replacing the ac pump, dryer, and orifice (where is it on my 96 5.8?), and I think it needs a new oil pan gasket, which I'm gonna try to do in-place.

 

The orifice is stuffed down inside the inlet leg of the Evaporator. The inlet goes down at roughly a 45 degree angle. Look for it going into the black plastic Evap case, just over from the blower case, where you are now. There is a A/C line that comes from the Condenser output, runs along passenger side wheel well, and goes to the Evaporator inlet leg.

Orifice tubes can be very difficult to pull out without breaking and making a junk evap. I would replace the evap, like I mentioned in the other post I think. I have yet to see an evap that I have pulled that wasn't covered with dirt and fibrous dust on its fins. It is a default "air filter" for the cabin!

 

I'm prepared to replace the evap if it looks black-deathy.

The o-tube is in here?