![]() Replaceable caps are available from auto parts stores for a small cost. Run the engine for fifteen to twenty minutes. Most cars do not have a temperature gauge here, so wait until the radiator is cool to the touch before removing the cap and emptying the contents of the sealant into the radiator. Never take a radiator cap off after the car was just shut off, as the system is under pressure. Radiator CapĪ malfunctioning radiator cap is an important engine part and could be the cause of fluid leaks in the coolant system. ![]() Include radiator hose inspection during oil changes or tuneups to prevent problems with the cooling system in the future. Replace all damaged hoses and clamps with new hoses. Perform a quick fix by cleaning the hose with a rag and wrapping the damaged area tightly with duct tape. Other signs of bad hoses included blisters and bulges, soft spots, hardening, and cracks. Some bad hoses may not show leaks until the engine is running. If the hose has a pinhole sized leak it is sometimes possible to see the coolant dripping from the hose. Make note if you see any fluid around these areas. Hoses and ConnectionsĬheck all connections where hoses connect to the radiator and the engine. If it's milky in appearance, or water bubbles appear, this is a good indication of a blown head gasket. Look at the color of the oil at the end of the dipstick. To check for a faulty head gasket, pull the oil dipstick. This will cause the coolant fluid levels to drop without any noticeable leaks under the coolant reservoir, hoses or radiator. Leaking or Blown Head GasketĪ leaking or blown head gasket will cause water to leak into the areas of the block where it was not designed to go. Replace the radiator or have it repaired at a radiator repair shop. But after operation, the radiator will give off a hot sweet smell and show signs of leaking underneath. Pinhole leaks may not be noticeable during operation, as the fluid will leak engine oil when the car is running under load. Small pinhole leaks in the radiator will cause coolant fluids level to drop. The radiator itself is prone to damage from stones and road debris and from general aging. Vehicle owners driving in climates with extreme temperatures should regularly check to make sure they have enough coolant. Use the recommended mix of coolant and water for your vehicle and fill to this location. Because of this, you need to check the reservoir level periodically to ensure coolant is between the minimum and maximum marks on the reservoir. This can happen on high-temperature days when you also run your air conditioning. Most overflow reservoirs come equipped with a small tube that allows the coolant to escape if the engine gets hot enough and the coolant expands past the full mark on the overflow reservoir. Allow the patching material to dry and replace the coolant reservoir. Patch the crack with a plastic welding material or epoxy. If the coolant reservoir has a crack allow the car to cool down. Coolant reservoirs are made from plastic and can be easily cracked. Coolant ReservoirĬheck the coolant reservoir for cracks and holes. All of these symptoms are explained below. This indicates that you have a head gasket problem. The worse case scenario is white smoke coming out of the exhaust system. Other signs include external coolant leaks like colored puddles under the car, and burning smell when the coolant drips on a hot engine. The next are visibly low levels of coolant in the coolant reservoir. The most obvious sign of a coolant leak is a warning light that will appear on your dash when coolant system problems are detected in your car’s engine.
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