In Toyota 4Runner vehicles there is the coolant reservoir which holds additional amounts of coolant to the whole engine cooling system. Usually made of plastic, this plastic reservoir is fixed along the side of the radiator and joined through a peculiar hose. Due to rise in temperature and increase pressure when the engine is in operation, water is forced out of the radiator cap into the reservoir. When the engine has cooled down for some time, the pressure released results to the coolant circulating back to the system. Toyota 4Runner utilize two types of coolant reservoirs: are classified into two types: pressurized type and non -pressurized type. The two kinds differ by their caps: transparent plastic cap - means that it is not a pressurized reservoir; metal cap with pressure rating - pressurized version is available. Maintenance tasks such as coolant flushing should be conducted periodically so as to avert problems such as fluid contamination, which if not corrected, may cause severe problems.
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