post #1 of Old 05-11-2013, 06:22 PM Thread Starter
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1993 YJ Wrangler 
Join Date: Mar 2012
Location: Newton
Posts: 521
Vacuum Storage Canister Reservoir

Do all YJ's have them? Where are they installed? What do they do?

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post #2 of Old 05-11-2013, 06:33 PM
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1988 YJ Wrangler 
Join Date: Nov 2009
Location: Pinion Hills
Posts: 8,241
They are under the battery. A little bulb thing. It's for use of the 4wd system if I'm not mistaken.

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post #3 of Old 05-11-2013, 07:30 PM
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1990 YJ Wrangler 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
Yep. The CAD system is vacuum operated. Without the reservoir, you'll lose 4WD when you romp on the gas pedal.
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