What Causes Water Spray from a Truck's Radiator?

[DeSilas]

Here are the reasons for water spray from a truck's radiator: 1. During refueling: When a diesel truck is refueled, water spray from the radiator opening indicates gas in the water. 2. Rising water temperature: If the radiator is completely filled, water may spray out once due to expansion when the water temperature rises, which is normal. 3. Accelerating: If the engine temperature is too high and the water is boiling, accelerating can cause boiling water and steam to continuously spray from the radiator opening. 4. Gasoline combustion: If the radiator is completely filled and water sprays out every time the vehicle starts or accelerates, it may indicate a damaged or loose cylinder head gasket. When accelerating, the high pressure generated by fuel combustion in the cylinder forces large amounts of gas into the water passages through the damaged or loose areas, causing water to spray from the radiator opening. 5. Cracks: If there are cracks or sand holes in the cylinder liner or cylinder head, water spray will increase with acceleration. The spray is most intense during sudden acceleration and stops only when there is no water left in the damaged area, leaving only gas to escape.