Re: 3rd seat won't fold down
It could be that the seat isn't fully latched in place in the upright position -- not locked down completely. Try firmly pushing it down to ensure that it is latched, then use the 1-2 levers to fold it up.
I had this happen with mine once, and discovered that the seat hadn't been firmly latched in place upright -- I give it a good slam now and listen for the latch to catch -- no more problems.
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2003 Hummer H2
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