"Top radiator hose was very hot and hard with pressure. Hose at top of radiator to overflow was hot. Bottom hose on reservoir was cool. Reservoir itself felt lukewarm."

Have no idea where you are located, but if you are using your heater I would assume that you live in an area of cold weather. If your anti-freeze was not up to snuff, it is possible that you had an ice blockage in one of your radiator hoses that was not allowing the flow of coolant to circulate. You end up with a buildup of pressure within the rest of the system and you get an overflow condition when you relieve the pressure. If this is not the case, then the prior poster mentioned a blown head gasket, and gives the method of determining if that is the case. Good luck

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96 E300d