Radiator boils over when shut off

Hi;
I have a 94 Cadillac. It doesnt seem to run hot at all, but when you shut the vehicle off after driving it for thirty minutes, the coolant boils over into the coolant resorvoir and onto the ground. the
radiator looks OK and doesnt feel hot at all. Any idea what to check?
Thanks Pat
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Likely low on coolant. What does the tank indicate when the engine is cold?
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-Mike-
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