Hey my friend the thermostat in not like others its a real pain here is exactly what you have to do if u have the 4200 vortec How to replace thermostat 4 2 envoy or trailblazer
btw in case u was wondering or did not know the trailblazer and envoy is the same
If You follow the hose from the top of the radiator to the engine, it will be attached to a fitting that is bolted to the top pf the block, usually with 2 bolts.
The thermostat is located under that fitting.
With the engine cool, open the radiator cap to make sure that pressure is released. Drain coolant to get it below the level of the thermostat. Disconnect the hose, unbolt the fitting, gently pry it up. and remove the old thermostat. Clean, install new one, gasket or sealer, bolt it back in, re-install the hose, add coolant, replace radiator cap start and check for leaks
SOURCE: 2006 Envoy Denali: nunmber 6 cylinder is not firing
yes repace plug wire and recheck still has mis replace coil pack.I hope this helps you?
SOURCE: REDUCED ENGINE POWER IN A 03 ENVOY
may have a bad throttle body check for codes if you have a p01516 must of the time it is a throttle body problem
SOURCE: How do I replace a thermostat in a 2004, 6
If you go to www.trailvoy.com and do a search on thermostat replacement, you will find a thread that details the process.
SOURCE: HOW DO I LOCATE CYLINDER 6 ON A 2003 GMC ENVOY THAT HAS A 4.2 V-6
the last cylinder is the number 6 front to rear
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