Have system pressure tested at local shop unless the problem is obvious. Check coolant lines (upper and lower) to see if they are leaking. Check radiator for leaks. Water pump may be leaking. Also head gasket could be letting coolant in to oil. Pressure testing will check all these components
The water pump from Mazda 626 is the same, all part from Mazda 626 work very good in the Kia Credos and Clarus.
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