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2001 grand caravan 3.3 While checking the front driver tire air pressure I noticed what looks like a 12" vacuum line hanging down the wheel well. I traced the hose to the bottom of the front left battery tray where it exits from a small box. Does anyone know what it is and where it goes to?
 

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Cruise control servo? Is there a throttle cable coming out of that box under the battery?
 
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Could it be a drain basin?
 
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