What are these mystery boxes?
Senior Member
Joined: Apr 2000
Posts: 5,438
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HI!
NEAL knows!
quote from Neal:
"The small rectangular shaped black box behind your battery is actually a vacuum resivoir for storing vacuum to operate your climate controls when your truck is not running. I removed mine with no after effects. You just can't use the climate controls when the engines not running. Like who would want to anyway?"
from this thread: https://www.f150online.com/forums/sh...hreadid=115669
about halfway down the page..
NEAL knows!
quote from Neal:
"The small rectangular shaped black box behind your battery is actually a vacuum resivoir for storing vacuum to operate your climate controls when your truck is not running. I removed mine with no after effects. You just can't use the climate controls when the engines not running. Like who would want to anyway?"
from this thread: https://www.f150online.com/forums/sh...hreadid=115669
about halfway down the page..
Last edited by clonetek; Jul 7, 2003 at 02:47 AM.
Senior Member
Joined: Jan 2000
Posts: 1,300
Likes: 0
From: Sugar Land, Texas
Originally posted by clonetek
HI!
NEAL knows!
quote from Neal:
"The small rectangular shaped black box behind your battery is actually a vacuum resivoir for storing vacuum to operate your climate controls when your truck is not running. I removed mine with no after effects. You just can't use the climate controls when the engines not running. Like who would want to anyway?"
from this thread: https://www.f150online.com/forums/sh...hreadid=115669
about halfway down the page..
HI!
NEAL knows!
quote from Neal:
"The small rectangular shaped black box behind your battery is actually a vacuum resivoir for storing vacuum to operate your climate controls when your truck is not running. I removed mine with no after effects. You just can't use the climate controls when the engines not running. Like who would want to anyway?"
from this thread: https://www.f150online.com/forums/sh...hreadid=115669
about halfway down the page..
Thread Starter
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Senior Member
Joined: May 2002
Posts: 4,928
Likes: 1
From: The People's Republic of Los Angeles
Thanks, Clonetek. I even had a post on that page. Duh. It's either the old age or the bong hits.
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Member
Joined: Oct 2001
Posts: 87
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From: Southern Illinois
I took both mine out along with 4 FEET 
of vacuum hoses running all over the engine bay for the boost dump solonoid and just capped it off. It is so much cleaner now, and i took off all that loom crap off everything too with all that sticky tape. Will be relooming the visible lines soon.. Just remember to keep vacuum running to the line going into the firewall for the climate controls...its behind, underneath the starter solonoid.
of vacuum hoses running all over the engine bay for the boost dump solonoid and just capped it off. It is so much cleaner now, and i took off all that loom crap off everything too with all that sticky tape. Will be relooming the visible lines soon.. Just remember to keep vacuum running to the line going into the firewall for the climate controls...its behind, underneath the starter solonoid.
Member
Joined: Jun 2003
Posts: 13
Likes: 0
From: HENDERSON, NV
The top mystery box is a vacuum reservoir for your a/c system. The bottom one is for your e.g.r. system. They store vacuum to keep your air that comes out of the dash when in the a/c mode or vent mode to remain operational when you have no vacuum. Otherwise the air comes out from the defroster vent or the floor like when the heater is on. The one for the e.g.r. stores vacuum so that the e.g.r. valve doesn't open or close when it's not supposed to. Your vacuum goes away when accelerating or going uphill. These store your vacuum for those times when it is needed.