I had a pump failure and about to replace. It says to flush system prior to pump install, do I just do as on some threads and spray hose into top rad hose and let it drain out bottom? Just want to get all the dex out and refill with nice green new stuff. Second. Bought thermostat to replace at same time and asked for the 180 but nothing on it says which it is and am worried it may be the wrong part. all it says is Calorstat Thermostat 154 2002, Vernet. Can anybody find the rating on the thermostat? Third, am going to use copper permatex gasket to seal around water pump, is this correct? thanks guys. hope you can help.