Things I would do are 1 put a new thermostat in the car (180 degree), they are cheap. 2 there is a product for cummins diesel that is made to clean the motor and radiator while you drive , When I find my bottle I will get the name for you 3 drain your coolant and use 85% REd line water wetter and 15% red coolant ( toyota or gm ) the reason for the red is because it controls ph levels for motors that have aluminum parts . Also water pump blades could be rotted off .And if the radiator is clogged get an aluminum champion radiator from e bay , there is no epoxy in the radiator and they are 100% welder . I have one for an rx7 in a glc 12a car and the radiator works great ( I never pass 190) good luck
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