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if my catalytic converter is clogged (not totally ) would this cause it to.... on 1995 Geo Prizm

would this cause it to overheat and blow up my radiator? Or, could it be i have a blown head gasket? at first i thought it was the thermostat...but i took it out and it still blew up another radiator. i blew up a third radiator today! WTF I'm baffled. I put a new radiator in it and ten miles later it just blew up around the radiator cap.

Asked by for the 1995 Geo Prizm
Got to be compression from the engine going into the cooling system. I say head/gasket problem!! Just how hot did it get? Quit running?
2 more answers
Blown headgasket! Get a block check done to be sure...
I had a nissan pickup that had a clogged cat close to the engine and it caused the head to warp, cracked the valve guides, and spew coolant quick. repair was $1,500. If you know the cat is mostly clogged, change it out.