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2004 chevy trailblazer_lt
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Attached is a pdf with a couple of pages related to the jack. The picture on the first page should help.
 

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Premium Member
2004 chevy trailblazer_lt
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2,765 Posts
OK. I ran across another image that shows things a little better. Hopefully it will be of some assistance.

Motor vehicle Rectangle Font Art Automotive design
 

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2004 chevy trailblazer_lt
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Just one more of the many minor differences between the EXT and non-EXT versions.

I think you are correct about the rear HVAC being only an HAC system.
 
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2004 chevy trailblazer_lt
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According to the parts list that goes along with the diagram, Part #1 is some kind of retainer. It's been so long since I looked at it I cannot say if mine has one.

Likely, one end fits under a lip on the floor and then you flip it up and over to kind of lock it into place - just a wild you know what kind of guess.
 
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