How do I change the thermostat on a 1991 Toyota Previa van?

Here are the instructions. http://www.autozone.com/shopping/repairGHow do I change the thermostat on a 1991 Toyota Previa van?follow top hose back to motor remove hose and two bolts in that housing lift remove thermostat scrape off old gasket replace with new thermo and gasket.. tighten bolts put on hose fill radiator with coolant and crank and check for leaksHow do I change the thermostat on a 1991 Toyota Previa van?Follow the upper radiator hose down to the thermostat housing. Either drain the radiator in a plastic pail or siphon off the contents of the radiator with a piece of inexpensive small diameter hardware-store vinyl hose. Remove the upper radiator hose from the thermostat housing. Remove the small capscrews or bolts from the aluminum thermostat housing. It may be necessary to %26quot;tunk%26quot; the housing with a rubber hammer or pry it off with a screwdriver. If your thermostat gasket is just an O ring it pays to lubricate it with silicone ignition grease before bolting the housing back on. If It's a gasket, wipe both sides with Prematex Blue Silicone Gasket maker before bolting the housing back in place. Remenber that the thermostat goes back in with the spring end pointing down.