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Q: After replacing water pump, thermostat

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After replacing all that, car over heating

My car has 140 miles.

Overheating has many causes. If you just added coolant after replacing the water pump and thermostat, but did not use the purge points to expel trapped air, that in itself could be the cause. Trapped air in cooling systems causes overheating because the coolant flow is blocked. If you suspect trapped air, swerving sharply while driving can sometimes dislodge the bubble of air and get it to travel to the top of the radiator where it won’t impede coolant flow. Apart from trapped air, the engine itself could be out of tune (a lean misfire for instance will cause the engine to run hot) or the ignition timing could be off. The catalytic converter could be plugged. You could have a head gasket leak into the coolant. The radiator pressure cap could be defective and opening at too low a pressure. The radiator could be partially plugged. The brakes could be dragging and/or the tires are underinflated. The water pump might not be running at engine speed due to a loose belt.The lower radiator hose could be blocked or partially collapsed. The electric radiator cooling fans could be inoperable. An option for you is to request an overheating diagnostic and the responding certified mechanic will get this diagnosed for you, once and for all. Once the root cause of the overheating is identified, the mechanic will let you know of the required repair.

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