right behind the alternator and AC compressor, you will have to remove one of these to get the housing out, very light with the rtv on both sides of gasket, dodges are the only ones i have to add rtv to t-stat gasket
Its on the top of the motor. Follow the upper radiator hose to where it enters the intake manifold. The thermostat will be right there. There will be just 2 bolts to remove to take out the thermostat. When replacing it make sure you replace the gasket also, or use some RTV silicone to seal it.