It might sound like a stupid question, but what do you call the thing you put in the pipe where the coolant circulates in order to warm up the whole engine? I know about engine block heater, but all it does is warm up the oil at teh bottom of teh engine. What I want and had some 20 years ago in a 240, was the heating element inserted in the pipe leading to teh radiator. Btw, it is for a 240 Also,any idea where I might be able to buy one of those things? Thanks