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The 4200 Vortec inline Six does not have a belt. It in fact has a timing chain to drive the dual overhead camshafts. I do not know the regular service interval for the chain however I do know several members of the forum are at 200,000 miles without problems. www.trailvoy.com All the answers for your Trailblazer from true enthusiasts!
What else can I help you with?
2004 Chevy Trailblazer have a timing belt or chain?
Chain
What is the labor time to change a thermostat on a 2004 Chevy Trailblazer?
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
How do you adjust timing on 2004 Chevy Trailblazer?
You DONT the ECM Electronic Control Modual does it for you...
How do you remove an oil filter from a 2004 Chevy Trailblazer on a 2004 Chevy Chevy Trailblazer 4.2 liter?
Seeing as your not that savvy.. take it to a 'lube shop let them change your oil
How do you change the water pump on a 2004 Chevy Trailblazer?
see "how too replace water pump on 2002 Trailblazer"
How do you replace a starter on Chevy Trailblazer?
Where is the starter on a 2004 Chevy trailblazer.
How many quarts of oil in a 2004 Chevy Trailblazer?
The 2004 Chevy Trailblazer holds 7 quarts of oil.
Chevy trailblazer 2004 gauges not working?
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
Where to find MAP sensor on 2004 Chevy Trailblazer?
where is map sensor on 2004 trailblazer
How do you change the rear brake pads on a 2004 Chevy Trailblazer?
Trailblazer enthusiasts will cover all the subjects including brake jobs at www.trailvoy.com
What is the recommended mileage to change the timing belt for a 2004 Chevy Blazer?
It does not have a timing belt, Chevy did not use timing belts in there truck engines.
Where is vacuum hose located on 2004 trailblazer?
I need a diagram for the vacuum lines on a 2004 Chevy trailblazer
