Esteem GL Wagon L4-1.6L (1998)
Radiator Cap: Description and Operation
A pressure-vent cap is used on the radiator. The cap contains a pressure valve and ventilation valve.
The pressure valve is held against its seat by a spring of predetermined strength which protects the cooling system by relieving the pressure if the
pressure in cooling system rises by 90 kPa (12.8 psi).
The ventilation valve operates as follows.
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It opens to let the air out of the radiator when the temperature and the pressure in the radiator are lower than ventilation valve weight.
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It closes when the engine has warmed up and the pressure in the radiator has risen.
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It opens when the engine has cooled after being warmed up once and vacuum has occurred in the radiator so as to prevent the coolant level in the
radiator from falling and the radiator from being collapsed due to the vacuum in it.
Note:
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Do not remove radiator cap to check engine coolant level; check coolant visually at the see-through coolant reservoir tank.
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Coolant should be added only to reservoir tank as necessary.
WARNING: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature
of the solution in the radiator without causing the solution to boil. Removal of the radiator cap while engine is hot and pressure is high
will cause the solution to boil instantaneously and possibly with explosive force, spewing the solution over engine, fenders and person
removing cap. If the solution contains flammable anti-freeze such as alcohol (not recommended for use at any time), there is also the
possibility or causing a serious fire.
<For WAGON model>
A pressure-vent cap is used on the radiator. The cap contains a pressure valve and ventilation valve.
The pressure valve is held against its seat by a spring of predetermined strength which protects the cooling system by relieving the pressure if the
pressure in cooling system rises by 110 kPa (15.6 psi).
