How do you replace the thermostat located on a 1994 Subaru Legacy 4WD?

the thermostat is located under the car just follow the big lower radiator hose to the motor and its right there

True-- thermostat is located inside the engine part (water pump) where the lower hose attaches to the engine. Be careful with the bolts, use penetrating oil, you do not want to break one. Try to use a Subaru thermostat and gasket-- expensive, but cheaper than an overheated engine, most places do not stock the required thermostat, being an oddball temperatiue (167F), putting in a "regular 195F" thermostat WILL cook your engine. The gasket is really an O-ring affair-- it works nicely. Try not to re-use the old O ring gasket.