There should be 2 clips at the top of the headlight assembly
Pull these clips upward and entire assembly should pull out of grill area allowing access to bulbs.
The owner's manual details this maintenance item...
Where is the starter on a 2004 Chevy trailblazer.
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replace the starter
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
see "how too replace water pump on 2002 Trailblazer"
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Remove fuel tank for access
if you do not have no experience in fixing car, do not do it
replace water pump 2005 chevy trailblazer vortec 4200