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Expansion tank in a 1987 Saab 90 (brown plastic tank with white lid at top of picture) An expansion tank, also known as "overflow bottle", is also used in the cooling system of most internal combustion engines, to allow the coolant, such as antifreeze, and the air in the system to expand with rising temperature and pressure. The tank is also ...
An overflow tank that runs dry may result in the coolant vaporizing, which can cause localized or general overheating of the engine. Severe damage may result if the vehicle is allowed to run over temperature. Failures such as blown head gaskets, and warped or cracked cylinder heads or cylinder blocks may be the result. Sometimes there will be ...
The resulting mixture of the two fluids would result in a thick brown "milkshake"-like mixture, visible in the coolant overflow tank. Saturn released unadvertised policy which would cover this issue, extending the warranty on the cylinder head to 6 years or 100,000 miles (160,000 km).
A coolant is a substance, typically liquid, that is used to reduce or regulate the temperature of a system. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert and neither causes nor promotes corrosion of the cooling system. Some applications also require the coolant to be an electrical insulator.
Chevrolet added a coolant-overflow bottle and an electronic low-coolant indicator in 1974 that could be retrofitted to earlier models at no cost. Under a revised 50,000-mile (80,000 km) engine warranty for 1971 to 1975 Vegas, the owner of a damaged engine could choose a replacement with a new short block or a rebuilt steel-sleeved unit, which ...
Proper engine coolant and a pressurized coolant system obviate these shortcomings of water. With proper antifreeze, a wide temperature range can be tolerated by the engine coolant, such as −34 °F (−37 °C) to +265 °F (129 °C) for 50% (by volume) propylene glycol diluted with distilled water and a 15 psi pressurized coolant system.