Why Does the Car Keep Losing Water Even Though the Radiator Isn't Broken?
2 Answers
Because of leaks in the radiator or pipes and poor sealing of the cylinder head gasket. Effects of poor cylinder head gasket sealing: Reduces engine power and mechanical efficiency. During the engine's exhaust stroke, high-temperature gases in the cylinder cannot be completely expelled from the piston, and some gases escape to the surrounding engine area, damaging the vehicle's electrical circuits. It also reduces the engine's mechanical strength, and in severe cases, can lead to cylinder explosion. Function of the cylinder head gasket: The cylinder head gasket is installed between the cylinder head and the cylinder block. It ensures the sealing of the cylinder through cylinder head bolts, preventing the leakage of combustion gases, coolant, and lubricating oil. It must tightly seal the high-temperature and high-pressure gases generated inside the cylinder, as well as the pressurized and flowing coolant and engine oil passing through the gasket, and must withstand the corrosion from water, gases, and oil.
The radiator isn't broken but keeps losing water - I've encountered this issue several times. The most common cause is hidden leaks, such as aging cracked hoses connected to the radiator or deformed rubber gaskets that slowly seep over time. Especially in older vehicles, plastic and rubber components become brittle easily. Last time my car left puddles in the garage, it turned out to be a loose drain valve under the radiator. Another possibility is water pump issues - a faulty pump seal can leak water from the shaft seal. A damaged engine head gasket may also allow coolant to seep into combustion chambers, with white exhaust smoke being a telltale sign. Don't overlook the radiator cap either - a failed pressure cap can't retain coolant, causing rapid evaporation. The best diagnostic method is adding dye to the coolant, driving briefly, then using a UV light to inspect underneath - glowing spots indicate leaks.
