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The main issues with the Ford Fiesta are related to overheating, including a blown head gasket and a plugged heater core. It's important to replace the coolant every 60,000 miles and change the air filter every 15,000 to 30,000 miles. Additionally, the spark plugs should be replaced every 100,000 miles, except for copper ones which need changing every 30,000 miles. Engine problems may arise such as loose gaskets, spark plug issues, oil leaks, and excessive oil consumption. Engine overheating is a critical issue that can lead to fires and even the car exploding, so it must be addressed promptly.
Experiencing overheating is a frequent problem found in newer Ford Fiestas caused by inadequate or defective connections of the coolant hoses to the water pump and radiator. Additional common issues reported are failures of the original radiator fan and thermostat.