what does this do ?
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Freshman User
Joined: Apr 2017
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From: sydney australia
what does this do ?
hi all
does anyone know what this white unit does and what's it called .
its coonected to the above black box .
it has 2 vacume plugs but it only has one vacume connected ,
the small black plastic container had a loose wire that wasn't connected to anything,
its a f100 1986 XLT.
i snapped off the vacuum hose
thanks
does anyone know what this white unit does and what's it called .
its coonected to the above black box .
it has 2 vacume plugs but it only has one vacume connected ,
the small black plastic container had a loose wire that wasn't connected to anything,
its a f100 1986 XLT.
i snapped off the vacuum hose
thanks
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
So, you are in Oz? Would you, please, put that in your info in the user control panel so we don't have to ask every time?
Your HVAC system appears to be quite different from ours. But, are you sure that is a wire and not a hose? If it were a small vacuum hose it could connect to the white thing. However, I don't know what the white thing is. I see that the top screw slot appears to be elongated for adjustment. Have you pulled it off to see if there is something behind it that moves it?
Your HVAC system appears to be quite different from ours. But, are you sure that is a wire and not a hose? If it were a small vacuum hose it could connect to the white thing. However, I don't know what the white thing is. I see that the top screw slot appears to be elongated for adjustment. Have you pulled it off to see if there is something behind it that moves it?
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Freshman User
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From: sydney australia
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Thanks for the location info. 
Does the air temp arm activate the plunger? Perhaps it provides vacuum to a shutoff valve in the water supply to the heater core when the temp is set to its coldest setting. Check the heater hoses for a vacuum-controlled valve.
Does the air temp arm activate the plunger? Perhaps it provides vacuum to a shutoff valve in the water supply to the heater core when the temp is set to its coldest setting. Check the heater hoses for a vacuum-controlled valve.
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FTE Legend
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From: Northeast, OK
I would guess it is a cold air valve, or something like that. We don't have them here, but sure wish we did as we have hot water flowing through the heater core at all times, and that makes the Max A/C and Vent positions warmer than they need to be. So, if you find out maybe we can incorporate them?
Lead Driver
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If you can't find a replacement, can the existing hose barb be repaired?
On other vehicles with similar damage, I'd carefully drill a short way, stopping well short of the internals. Then fit a short piece of brass tube to create a new hose connection. Secure the new brass piece with epoxy on the outside only, and you're good as new. I've done this several times on vacuum parts that were otherwise unobtainable.
On other vehicles with similar damage, I'd carefully drill a short way, stopping well short of the internals. Then fit a short piece of brass tube to create a new hose connection. Secure the new brass piece with epoxy on the outside only, and you're good as new. I've done this several times on vacuum parts that were otherwise unobtainable.
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