The battery in the 2003 Pontiac Montana is located in the engine compartment on the passenger's side just behind the headlight assembly. Changing the battery can be a little challenging because the Pontiac saw fit to bury it below several other parts in the van. The under-hood fuse box sits directly above the battery and a cross brace runs over the top of it as well. Dealing with both items is not complicated but does add time to the process. Read more here, cortesy of eHow.com: http://www.ehow.com/how_6131525_replace-battery-2003-pontiac-montana.html (How to Replace the Battery in 2003 Pontiac Montana eHow)
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