Recently I changed both upper and lower hoses on my '91 300SE. I just so happen to live on a hill and had the nose up when refilling the system. What's this about bleeding the cooling system? After also changing the coolant level sensor there does not appear to be any leaks but the last couple of days I have noticed the faint odor of antifreeze after it's warmed up. Hoses, tank, pump, radiator checked out and nothing seems to be leaking.

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)