How do you replace thermostat

If you have the 4 cylinder engine, the thermostat is located in the thermostat housing on the engine, which is attached to the bottom hose of the radiator. drain the coolant into a clean receptical so you can reuse it, if you don't want to buy new coolant. 2 bolts remove the housing. remove the bolts and if the housing is stuck, give it a couple of taps with a handle of a hammer. remove the thermostat and replace, ensuring the notch in the gasket is in the correct position at the top of the inlet hole the new thermostat should have a jiggle pin on the mounting surface that should be aligned to the notch on the gasket. this is necessary to remove air from the system. replace the housing and tighten the bolts to 20 lbs of torque, which is not much. on v6 engines first remove the coolant pipe bolts and pull the pipe from the housing, then remove the housing.
when filling, the top hose must be squeezed to remove air. when the radiator appears full, slowly squeeze the top hose tp expel air. continue this procedure until no bubbles are present. replace cap and fill reservoir 1/2 full. run the car to operating temp and turn the heater on high. if no heat, air is trapped. drive the car to help expel the air. the heater will get hot. park the car and let cool completely. check the radiator and re-fill if necessary. repeat if needed