Ok, water pump located haha. Filled radiator with water- ran car for 3 minutes or so - but temp was creeping and creeping. got the the notch between 250 and 175 and i turned it off. No leaking or anything - I dont have a pressure tester so do i need to get one - or does is this check enough to ensure that theres no leak???

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1971 280SE - The S Class
1974 280CE - Sterling
1988 300E - Stanley