thanks for the link but it doesn't really answer the questions specific to my '91 240. It is just as vague as my haynes manual. that link and the haynes manual both say nothing more than "add water". Again, WHERE do I add the water? I don't see any big fill cap on top of the radiator. Also I don't see a drain plug on the bottom so I assume I need to loosen the bottom hose. This means the coolant will drain all over the frame/chassis that is directly below it. I was wondering if this is correct. Thanks again, hopefully someone can clear this up for me.