E350 Vent Vacuum Supply/Canister Location
 

My air only vents through the defroster. I have determined that I have no vacuum at the switch. The vacuum appears to run through the firewall on the passenger side but I can't find out where it comes out and I can't find the vacuum canister that supports the vents. It appears to be under the blower but I can't see it to tell for sure. A label in the engine compartment idicates that it is located in the front center to passenger side of the engine compartment. I simply can not find it. I went to a Ford dealer and they printed the page for the vent switches and vacuum lines. It shows the supply vacuum line but not where it comes from. Talked to a mechanic and he said their manuals don't show vacuum line locations.

If anyone knows where the vent vacuum supply line originates or where the canister is located on a V-10 E350, I would really appreciate the information.

Thanks

Usually Ford puts a vacuum distribution block on the firewall that has a main supply line connected to the intake manifold. If you follow the lines from the intake you should be able to find this block. From the block you should be able to trace the vacuum line(s) for the instrument panel and heating and A/C. There probably is a vacuum line with a Tee and a backcheck valve for the cannister. Cannister may be located in a fenderwell best identified by a vacuum line running back into it.

John

Part description
 

The red vacuum line that comes from the engine and connects to the black line...what is that red hose called?

The reservoir you're searching for is found here:

https://cimg9.ibsrv.net/gimg/www.for...36417e7949.jpg

A closer view of the impossible location:

https://cimg8.ibsrv.net/gimg/www.for...37179f0707.jpg

(Visually rotate that photo ^^^ counter clockwise to get the best idea what a bad location this is.)

There's simply no way to access that reservoir with the engine installed---that might be evident from the photos. What I'm doing is buying the factory reservoir and check valve to relocate inside the cabin. I disconnect the factory connection that runs the red line (from the throttle body) to the black line (to the vacuum reservoir), usually found along the lower windshield cowl just about where the oil and trans fill tubes are located. I'll then push a suitable vacuum line through the evaporator case where one of the heater core tubes pokes though the firewall fishing it inside the cabin.

Part Numbers:

Vac Reservoir: YC2Z-19A566-AA
Check Valve : D70Z-19A563-A or Motorcraft YG-193

I find the reservoir's online (eBay, Amazon) for no more than $20 each, check valves at the dealer for just under $10 each.

Install the new reservoir and check valve according to the schematic, find the black line inside the cabin and splice the new reservoir and check valve into it.

Here's that schematic:


https://cimg8.ibsrv.net/gimg/www.for...7547580310.jpg


You're basically just relocating the factory installed reservoir to inside the cabin where its infinitely easier to access if/when needed.

I do remove the factory plastic lower dash trim and the metal knee protector plate (4 8mm headed bolts) and find a 10mm bolt holds parts of the lower dash superstructure in place. Drill out one of the mounting flanges on the reservoir, orient it so it fits snugly behind all the other dash parts and just a bit under the right side air bag. Test your air flow controls, when done replace all the dash pieces and you're good to go.

HTH

Any help on a diesel?

I have a 2009 E450 shuttle bus. I've done a fair amount of searching and it seems to be a vacuum issue. Most of the youtube videos on the quick fix involve 2 vacuum lines joined right by the oil fill--one being black and one being red. Well I have 2 vacuum lines joining in that same place but both are black. One seems to go over to the driver side then joined with a larger hose going down to what I presume is a vacuum pump.

When the vehicle is running it does not appear to be pulling a vacuum. I've tried the thumb test, wet thumb test, etc. and nothing.

So I'm trying to figure out if there's a fuse for this vacuum pump. There's no 4wd so no ESOF fuses that I can tell. I've poured over the 2 fuse panels and the corresponding charts and can't figure for the life of me what fuse to check but I presume it's powered by a fuse.

Is there a simple fix for this? Is there a fuse or relay I should check? Is there a simple fix? Do I need to replace the vacuum pump (doesn't seem easy to reach!)

Any help you can provide is greatly appreciated.