Re: how to i change thermostat in 2005 trailblazer
The thermostat is located behind and slightly below the alternator on the drivers side. For the best access to the thermostat, you should unbolt and move the alternator to reach the upper bolt. The lower Thermostat bolt can be reached by taking off the front drivers side tire and reaching in with a 24" extension. The actual bolts are 10mm. Hope this helps...
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Follow 'Top' Hose from radiator, that Alloy body the hose is connected to is the Thermostat housing, should be 2-3 bolts (12mm?) holding it down. Unbolt that, change-over thermostat and gasket (should be supplied with Thermo). Tighten bolts back up, Hose on, fill Coolant, then your done.
Hope that helps.
remove throttle body and and undo the 10mm bolt on top of water pump pull the black metal line up out of the water pump and pry the line away from the throttle body a to the other side of the exhaust becareful not to break the line then undo the two 13mm bolts that hold the thermostat housing and pull the thermostat.
You didn't mention what size engine you had. I am going to go with the most common engine and that would be the 4.2 liter engine. If this is your engine then the location of the thermostat is in the housing that the lower radiator hose connects to the engine. Just follow the lower hose and you will find the housing. Now you can't just buy a thermostat for it. The thing comes as a whole assembly housing and all and you can find it at your local auto parts store for about 25 dollars. Below is a picture of its location for you. The bottom bolt is not a problem to get off. The top one is another story and you have to get at it with a wrench and turn it a little at a time because you don't have much room to turn it. A little pointer is to do the top one first. trust me on this. Also when putting the O-ring which is the gasket for it you will need to use a VERY little bit of RTV to help hold it in place on the new housing when installing because it will fall out. remember to only use a little bit, just enough to hold it in place. If you use to much RTV it will leak. I hope this helps and is the engine you have and good luck.
Follow the upper radiator hose from the radiator to the engine. The thermostat is located in the housing where the upper radiator hose connects to the engine. There are 2 14mm bolts that hold the housing down, remove the bolts and housing and replace the thermostat.
You do not state what engine your vehicle has.
These directions are for the straight 6 engine;
"The thermostat comes in a housing that bolts directly to the motor, and is located on the driver side of the motor, near the bottom, instead of the top. To get to it you have to remove the battery and left front wheel. You also need a very long extension for your socket to go through the wheel well to remove, and install, the bolts holding the thermostat housing to the motor. " If you have a different engine, post the info.