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I would start with a good tune up, including the intake gasket. Changes in temperature could cause gaskets to stop sealing properly letting unmeasured air inside the engine. Also check for fuel filter.
Question Posted by Asker under the 1994 Mazda for a 1993 Mazda.
Click on the following: free, direct Link. It has several Diagrams including the Serpentine Belt Diagram for your 1993 Mazda 626 2.5L DOHC V6. It has the 2.0L DOHC 4-Cyl Diagrams as well as Instructional and Directional Diagrams that will help you.
The cooling fan must run or the car must be running into the wind to keep from cooking the engine. Physically turn the fan to see if it turns freely (cold engine). The computer reads coolant temperature and trips the fan relay on when normal temperature is reached. You need to read the control voltage at the relay to determine the problem. Possible bad temp sensor.
It probably needs a thermostat check coolant fluid level make sure it has enough coolant then replace thermostat make sure antifreeze has a 50% water 50% antifreeze mixture.
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