On my 02 you open the hatch, take out 2 screws, then carefully pull the light STRAIGHT back. Once that is off you have to unscrew the panel on the back of the light itself, think there are 3 screws there. Then pull that out, you will have all 3 bulbs out still in their board. Replace bulb and reverse the steps
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replace the starter
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
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see "how too replace water pump on 2002 Trailblazer"
Remove fuel tank for access
We have complete instructions at our enthusiasts forum at www.trailvoy.com
if you do not have no experience in fixing car, do not do it
replace water pump 2005 chevy trailblazer vortec 4200