Where is the thermostat on a 03 Chevy Trailblazer?
Where is the thermostat on a 03 Chevy Trailblazer? The thermostat on a Trailblazer Inline 6 cyl is on the drivers side, lower hose, behind alternator, not in the upper hose. The thermostat on my 2003 Chevy trailblazer in on the upper passenger side 4.2 I6. If it is actually there, someone put it in the wrong spot because it is not on the passenger side top. Where do you put the thermostat on a trailblazer? This can be done very easily and keep your Trailblazer running efficiently. Place a drain pan on the ground under the radiator drain plug...