I believe the problem is thermostat related... or water pump. Water pump should be leaking if that is the problem. There is nothing that could seal off and clog 90% of the radiator... other than a misplaced tennis ball. The heat you feel in the corner of the radiator is just from the heat in the hoses.

Test the thermostat by blacing it in a pot of water that is being heated on a stove to see if it pops open when the water gets increasingly hotter.

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra