![]() This allows the system to maintaining full coolant capacity at all times.Ī recovery/reservoir tank can be used in conjunction with an expansion tank or can be plumbed off of a radiator that features a pressure relief.Ī recovery/reservoir tank should not be confused with a catch tank however. The pressure relief in the expansion tank should be the highest point in your coolant system.Ī coolant recovery/reservoir tank gives the system the ability to discharge and recharge coolant when needed to maintain the appropriate pressure. Since the tank is under pressure it will require a pressure rated cap and neck, (Shown right). An expansion tank can easily be recognized by the neck and cap used. Expansion Tank Set Up:Īn expansion tank is part of the pressurized section of the coolant system. One of the easiest ways to differentiate between an expansion tank and a recovery tank is whether the tank is part of the pressurized part of the coolant system or not. At 16 psi the boiling point of a 50/50 mix is 267 degrees F. The boiling point of a 50/50 coolant water mix is 226 degrees F at 0 psi. Liquid cooled systems are pressurized in order to raise the boiling point of the coolant. ![]() ![]() In those applications a recovery style tank may be used instead. When the radiator is high enough to act as a fill point and pressure relief an expansion tank is not necessarily required. This is accomplished with an expansion tank. Since the radiator is lower than the engine a pressure relief and fill point that is higher than the engine is needed. In many modern cars the radiator is mounted lower than the engine. The type of coolant tank and the fill point location can vary depending on the system. However, most modern cars require liquid cooled systems.Ī liquid cooled system typically features a radiator, fan, thermostat, water pump, a coolant tank, and a fill point. Many old cars and even some newer motorcycles feature air cooled engines. There are two ways that engines have traditionally been cooled, by air and by water. At the same time an engine that is running too cold can be inefficient and poor performing. Running an engine too hot can cause fluids and parts to break down and can ultimately lead to a catastrophic failure. Cooling systems are one of the most important systems in an engine.
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