Just got my '83 240d three months ago so I'm a true noob. Anyway, I'm losing coolant, and the temperature guage creeps up when the Benz is in need of a quart or so which is once a week. I was changing my oil today and while underneath loosening the oilpan plug I noticed something peculiar (to a noob). I was looking up and saw the end of the hose running from the radiator cap and some coolant that had leaked out on something under the hose.

This to me looked like the end that should be in the coolant reservoir. Not to mention I see no reservoir. The hose travels along the side of the radiator on clips and looks like its meant to be this way. This to me seems like the reason why I'm losing coolant. Is this how it's supposed to be. Don't forget...I am a noob!