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heat checker

Vacuum leaks

9 posts in this topic

I have a 2000 Ford F350 4x4 with the ESOF. Have narrowed down a vaccum leak to the part in between the canister and the outgoing lines to hubs and vent controls. If I pull vaccum lines off this part and bypass the part by hooking together with a hose, the vaccum motor pump will shut off, otherwise it runs continuos. I'm assuming this part is a solenoid that sends vaccum to the hubs when 4wd is activated.(three wires going to it). Question is, does anyone know the name of this part and how much to replace? I can't seemm to find the part on NAPA or Ford websites. Thanks for any help you can provide.

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Its called a vaccum hub solenoid. If you plugged off the lines out of the solenoid and it doesnt leak then, you will more then likely have hub seals leaking which are very comon. If it still leaks with the line from the hubs to the solenoid plugged then I would replace the solenoid.

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Cannot find anything with that name while searching either NAPA or Ford websites. Found something called "purge solenoid" along with "canister" in emissions section. Sounds like maybe the right part as it is somewhat of a "purge" of vaccum that locks and unlocks the hubs, but emissions doesn't have anything to do with it, does it?

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Your right it isnt an emission part. It is a vaccum hub solenoid is this gas or diesel?

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It's a 7.3 deisel. Computer searches are an animal of their own as far as the way it's worded. Have tried every configuration I can think of and come up empty. Best bet is something I learned when I farmed is take the part in and throw on the counter, tell them I need one of these, and walk out with the right part. I just don't want to be "surprised" by the price of it. Some electrical stuff can be outragous. I can't believe these parts are that hard to put a name on, as I think it's a fairly common problem with the ESOF.

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This is the name right out of the book "Pulse vacuum hublock (PVH) solenoid". The parts guys will know it by "vacuum hublock solenoid".

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If the hub vacuum seals are leaking, you can change over to manual locking hubs and never have to deal with them again.

As far as a vacuum leak at the hub lock solinoid, you will want to get that replaced, because it can affect your selector modes on you heater/a/c system and other vacuum operated stuff.

Good luck!

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After getting stuck trying to pull boat out of access in sand, having to unload and go around to cement landing, went to Ford and thy fixed me right up, $53 for a solenoid. Snorted around the yard and everything works fine, including the air vents.

Thanks for the imput.

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Sounds like it would have been easier to fix it before you went to the lake! blush

Thanks for posting the fix!!

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