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Follow top radiator hose to engine block, thermostat assy is attached with two bolts. First drain radiator, release spring clamp on assy and remove hose. Remove serpentine belt from Power Steering unit, loosen power steering bolts and slide to extreme left. You now have access to both bolts, remove both bolts and thermostat assembly,. Clean engine mating surface, install new thermostat assy with new o ring ;reassemble and Add coolant.

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Q: How do you change a thermostat in a 2002 Trailblazer 4.2 engine?
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