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Hi,the most likely cause of the repeated failure is internally leaking head gaskets it's pretty common.Sorry but than the head gaskets I have not run into any repeat radiator failures.
Hi,yes headgaskets can be replaced without a engine replacement but with this many miles it would be important to check all component carefully for damage.As for a blockage anything is possible but if there was a the coolant would not circulate do you have a problem with not getting any heat?
When coolant is filled and engine running are both heater hoses hot?
We need to replace the radiator again of course but before that remove both heater hoses and let water flow , you should see a strong stream of water coming out of other side of core this procedure is called back flushing, if water does not produce a strong stream the heater core is plugged.You can purchase a flushing agent a auto parts store that may free the clogging if not replacing will be necessary.