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Why would a car overheat if the radiator and thermostat has been replaced?

- Faulty water pump: The water pump is responsible for circulating coolant throughout the engine and radiator. If the water pump is faulty, it may not be able to circulate coolant properly, leading to overheating.

- Blocked or damaged hoses: The hoses that carry coolant between the engine, radiator, and heater core can become blocked or damaged, restricting the flow of coolant and causing the engine to overheat.

- Leaking head gasket: A leaking head gasket can allow coolant to escape from the engine, leading to low coolant levels and overheating.

- Insufficient coolant: Having too little coolant in the system can cause the engine to overheat. Make sure to check the coolant level regularly and add coolant if necessary.

- Faulty cooling fans: The cooling fans help to dissipate heat from the radiator. If the cooling fans are not working properly, they may not be able to draw enough air through the radiator to cool the engine, leading to overheating.

- Other mechanical issues: There may be other mechanical issues, such as a faulty temperature sensor or a problem with the ignition timing, that can cause the engine to overheat. It's important to have the overheating issue diagnosed by a qualified mechanic to determine the exact cause and get it repaired properly.