So I bought the new thermostat housing to get rid of the plastic one and I was just wondering on how easy it is to install so I dont run into leaks and problems. Would I just undo the hoses, catch liquid, take old thermostat out, replace with new one, put hoses back on, and fill coolant back up? and then i saw a youtube video where the washers on the factory bolts need to be taken off? true? any leaks afterwards? Thanks guys/girls