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If there was a problem with the head or head gasket that was causing excessive pressure in the cooling system you would have major coolant loss.
Before you spend any money on unnecessary repairs get it diagnosed properly. As Timbar suggested a TK test is a good place to start as this checks for exhaust gasses in the cooling system.
How long since the cooling system recieved any attention? The radiator could have an internal or external blockage, the thermostat may be faulty etc etc.
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