COOLING SYSTEM CAP, COOLANT RESERVE TANK [SKYACTIV-G 2.0]

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Purpose, Function

Cooling system cap

•  The cooling system cap maintains appropriate pressure in the engine coolant passage. In addition, cooling efficiency has been improved by increasing the engine coolant boiling point.

Coolant reserve tank

•  The coolant reserve tank separates air which has penetrated the engine coolant from engine coolant.

Construction

Cooling system cap

•  The cooling system cap is installed to the upper part of the coolant reserve tank.

•  A low-pressure type cap has been adopted for the cooling system.

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Coolant reserve tank

•  A degassing type coolant reserve tank has been adopted to integrate the simple airtight sub-tank and the air/water separating tank, improving the air/water separating function. The integrated and large-size degassing tank consists of a labyrinth structure with internal barriers to lengthen the distance to the outlet and reduce the flow speed. This lengthens the time the engine coolant has to accumulate, improving the air/water separation function.

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Operation

When engine coolant temperature is high

1.  When the engine coolant temperature is high, the pressure in the engine coolant passage increases and the pressure valve is pressed and opened.

2.  Air is discharged from the coolant reserve tank by opening the pressure valve.

When engine coolant temperature is low

1.  When the engine coolant temperature is low, the pressure in the engine coolant passage decreases and the vacuum valve is opened.

2.  Air flows to the coolant reserve tank by opening the vacuum valve.