Are you leaking coolant/low on coolant? - Find the leak, fix it, add coolant.
No leaks and steady coolant level? - Water pump, radiator/hoses clogged, thermostat is defective (your water pump does not have to be leaking to be bad by the way).
No leaks but still loosing coolant? - Head gasket improperly installed, head not torqued correctly, cracked/warped head or block
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