1. Check the coolant level: Open the coolant reservoir and make sure it's full. If the coolant level is low, add a 50/50 mix of coolant and water. Be careful not to overfill the reservoir, as this can cause overheating.
2. Check the thermostat: The thermostat regulates the flow of coolant to the engine. If it is stuck closed, it can cause the engine to overheat. To check the thermostat, remove it from the engine and place it in a pot of boiling water. If the thermostat doesn't open when it's in boiling water, it needs to be replaced.
3. Check the water pump: The water pump circulates the coolant through the engine. If it is faulty, it can cause the engine to overheat. To check the water pump, remove the radiator cap and start the engine. If you see a steady stream of coolant flowing through the radiator, the water pump is working properly.
4. Check the radiator: The radiator cools the coolant. If it is blocked or damaged, it can cause the engine to overheat. To check the radiator, look for any physical damage, such as dents or leaks. You can also try blowing air through the radiator to see if it's blocked.
5. Check the fan: The fan helps to draw air through the radiator and cool the coolant. If the fan is not working properly, it can cause the engine to overheat. To check the fan, turn on the air conditioning and make sure the fan is spinning. You can also try spinning the fan by hand to see if it moves freely.
6. Check the A/C compressor: If the A/C compressor is seized, it can cause the engine to overheat. To check the A/C compressor, try to turn it by hand. If it doesn't move, it's seized and needs to be replaced.
If you have tried all of these steps and your Mazda Protege is still overheating and blowing cold air, you may need to take it to a mechanic for further diagnosis and repair.
