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Here is a diagram showing where the thermostat is located on a 1994 Nissan Altima. Most vehicles are fairly similar as well the main water hose that goes to the engine is usually right next to or attached to the thermostat housing. Also once you take this hose off to get the thermostat you are going to need the bleed the coolant system because there will be air in the system. A simple google search or wikihow will show you exactly how to bleed air out with pictures and simple instructions. Good luck.
Start when totall cold and take radiator cap off. Wait about 10 minutes and look and see if water is flowing thru the top of radiator. If after 15 minutes it is not or the temp gauge is going into the red line then the thermostat is stuck..
follow the top radiator hose from the radiator to the engine, the spout the hose hooks to on the engine is the thermostat housing, you unbolt it, pull the old thermostat out, clean the joining surface of the thermo housing and the engine block of debri (old gasket) install new thermostat making sure the spring mechanism on thermostat is installed towards the engine, put the new gasket in place and reinstall the thermostat housing.
Locate the upper radiator hose. Follow it to the engine. The housing that the hose goes into is where the thermostat is located. The housing should have 2 or 3 bolts. Pay attention to how the old thermostat is positioned when you take it out. Hope this helps.
Did you bleed the cooling system after refilling the radiator ? to bleed the system, fill the radiator with water and coolant. Run the engine until it is at a good temperature. Then turn off the engine and look for a bleeding screw at the oulet of the thermostat housing and turn it with a screwdriver counterclock wise. The trapped air will go out and coolant will start coming out. refill the radiator and repeat until only coolant comes out and no air.be careful not to burn yourself.