Need a new heater core, presumably.

[Wulf202]

Simple check. If the cruise control works it's your blend door. If the cruise doesn't work it's a vacuum leak

[ChickNorris]

I will test the cruise control tomorrow. I suspect it's a vac issue but it'd be nice to rule something out if possible. Thanks!

[ChickNorris]

Simple check. If the cruise control works it's your blend door. If the cruise doesn't work it's a vacuum leak

Can't remember using cruise control in the last five years. Nope, doesn't work. Idiot light in the console does however. Heh, forgot what a lovely shade of green it is.

Thank you very much. That was a nifty trick.

[ChickNorris]

Hope you don't mind me asking but you seem to know much more than I about this... any recommendations as to where I should start looking now as I don't see anything terribly obvious?

[Wulf202]

The cruise control module is under the battery. Lines go up to the dash to an F type fitting above the steering box then over to the passenger side of the firewall to the heater core. The other end will go to vacuum but mine is a diesel so it goes to the vacuum pump. Yours will connect to the intake manifold somewhere.

The factory lines are both hard plastic and soft rubber. Best to gut the whole thing since it's only a few feet of tube and one fitting pack from the auto store

[ChickNorris]

Yup, that hard plastic line is very, very brittle, this I know.

So if I backtrack from the known port in the firewall (along with your description) I should be able to trace it & replace all the segments & not miss anything. I believe I know where it is bundled near the battery with my wiring harness for my plow (not my install) & another place it might cross by the steering column. I'll look in my repair manual & see if I can find a diagram of where it was originally installed too because...

My truck had quite a few people in there mucking about before I bought it. An example being the electrical was apparently reworked (by someone akin to field mice, crows or squirrels) for a camper & trailer & it took me a couple days to troubleshoot & correct everything wrong. It was such a hack job that I started over from scratch & rewired everything they did the second day.

Im excited I might be able to solve for this perhaps without pulling the dash. Thank you again!

[Wulf202]

Mine was a farm truck. Had to unfuck the wiring too.

There's also a check valve on there between the engine and the t or f fitting. They're usually pretty tough but you can check them yourself or just trash it.

[ChickNorris]

Now its the idiot light for the airbag, intermittent of course.
No codes. Appreciate suggestions please, if any. Thank you.

[Erni]

In the steering wheel?


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[ChickNorris]

Idk which it is referring