Chevrolet Blazer Repair Question
You probably have a 4.3vortec CPI its under the manifold tuning center top of engine. You have to remove it to get to it.
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As to the rear window, try appling some grease on the latch itself. Check it to see if it has wear on the piece that goes into the latch, if it has worn too much then it will not latch tight and will rattle.
Also check the mounting bolts at the top of the window, I have seen them get loose and cause a rattle as well.
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