Changing thermostat on 2000 Pontiac Montana- 3.4 L?

whats the proper way - remove throttle plate or exhaust crossover pipe???????|||Follow the top radiator hose towards the engine untill you reach a curved metal housing with a bleeder screw on it.Unbolt the two bolts replace the thermostat and gasket and bolt it back together.Then with the car running open up the bleeder screw on the top of the vavle untill you have coolant leaking out to bleed out the air in the system, and you should be good.If you do not have a bleeder screw on the housing , than with the engine off and cool,(do not open if car has been running) open the radiator cap and turn on the engine and let it burp/vent its self out.GL|||I am not familiar with the 3.4 liter but all the engines I know have the thermostat at the top of the engine, under the radiator hose housing. Remove two bolts and there it is!