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There is i believe, one vac line that travels to the dash HVAC controls, and one that returns back to the engine compartment to move some louvre back and fourth. I think this is one of them. On my truck, one is black and one is grey. The unplugged one in question is the grey one. I can’t see where it should be connected.
That looks like the vac line for the factory heater hose shut off valve., If yours is missing there's a fixed nipple on the HVAC housing that you can hook it up so you don't have a vac leak.
That looks like the vac line for the factory heater hose shut off valve., If yours is missing there's a fixed nipple on the HVAC housing that you can hook it up so you don't have a vac leak.
Below is where the nipple is at I circled it red.
Our trucks came with a shutoff valve from the factory? I don't think so.
Some 03's actually came equipped with them, and if the OP truck is an 03 then yeah, it came with it or at least had the vac line ready for the 6.0 equipped trucks that had them.
Hard to find any 03 pics on the Internet but managed to find one. here's an example of one
We had an 03 in our fleet years ago that had the line but was only plugged to the nipple I mentioned in my other post, there was no valve and from the looks of the heater hose line it looked factory, and since the truck was bought new in 03 im assuming that's how it came from factory but IDK.
Maybe someone that has worked with more 03 7.3's can shed some knowledge to this.
I ordered a 2003 F-550 XL with a 7.3L brand new, and the chassis cab was delivered directly to me (not to an upfitter), so I was the first person to open the hood (other than if opened by dealer in PDI), and it indeed had the vacuum actuated heater core bypass valve as built from the factory. I sold the truck out of state 18 years and four transmissions later.
4 transmissions - dang. I think I would have lost patience after 2. How did each fail?
My son's '04 with the 6.0 and heater valve using the grey line. I see the nipple z31freakify was pointing out. This thread was timely, as his grey line had degraded/broke, and was lying disconnected. Clipped the semi-rigid line a bit shorter and salvaged a boot from my previously removed front hub locking vacuum lines, and good to go.
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