Cooling System Description
System DescriptionThis vehicle has a pressure-type Cooling System system. A thermostat controls the coolant circulation.
A 103 kPa (15 psi) pressure-type radiator cap seals the cooling system, causing the system to operate at a higher than atmospheric pressure. The high pressure operation raises the boiling point of the coolant to about 125°C (257°F) at sea level, increasing the cooling efficiency of the radiator.
The pressure-vacuum valve radiator cap allows the coolant to expand through the pressure valve in the center of the cap without building up unnecessary pressure. The expanding coolant flows into the coolant recovery reservoir and the vent valve closes because of coolant expansion and flow. The nominal 103 kPa (15 psi) pressure will not be reached until the system works at maximum capacity. Any air in the cooling system will be forced into the coolant reservoir and out the vent tube at the top of the reservoir. As the system cools, the coolant in the reservoir draws back in the radiator through the vent valve, keeping the radiator full at all times.