Some intake manifolds have water jackets. Common symptoms are overheating and white smoke coming from the exhaust.Įarly 2000s Subarus with the 2.5 L four cylinder single overhead camshaft engine are particularly prone to head gasket failures if the head gasket has not been replaced since the car was new. When you have an internal head gasket leak, you are unlikely to notice any coolant leaking onto the ground. When a leak forms in the head gasket, it is possible for coolant to leak into the combustion chamber and burn off, exiting the exhaust.

Its job is to keep combustion gases in the combustion chamber and coolant in the water jackets. The head gasket sits between the cylinder head and the engine block. Look for steam near the radiator cap, and also check the overflow reservoir if your overflow reservoir is pressurized. 1) Bad Radiator CapĪ bad radiator cap may not seal properly, which could lead to coolant leaking past the seals and evaporating. Wait until the car cools off before topping it off with coolant. Never open a pressurized radiator or reservoir while the car is hot. It’s important to check the coolant reservoir and radiator if you suspect a coolant leak. If your coolant reservoir is empty, you may be slowly losing coolant. Most engines call for a 50/50 mixture of water and antifreeze. Modern engines use water, and this water is usually mixed with a substance called antifreeze.Īntifreeze is a liquid additive designed to lower the freezing point and raise the boiling point of water, allowing the cooling system to operate smoothly under vast ambient temperature changes.Īntifreeze also reduces the chance of water freezing inside the engine, which would otherwise render the engine inoperable. Why Is My Car Losing Coolant but Not Overheating?Ĭoolant, Radiator Fluid, and Antifreeze… What Does It All Mean?Ĭoolant, radiator fluid, and antifreeze commonly refer to the same mixture of water and antifreeze inside your radiator and are often used interchangeably.Įxcess heat can be transferred away from the engine using water or air.Coolant, Radiator Fluid, and Antifreeze… What Does It All Mean?.

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