Villager V6-181 3.0L SOHC VIN 1 EFI (1997)
Coolant Reservoir: Description and Operation
Coolant expands as the temperature rises in the system. When maximum system pressure is reached, the pressure relief valve in the radiator cap is
pushed from its seat and allows coolant to flow through the radiator overflow hose into the radiator coolant recovery reservoir. A rubber seal on the
underside of the radiator cap prevents coolant leakage.
When the system temperature and pressure drop, the coolant contracts and the pressure in the radiator is reduced. The coolant in the radiator coolant
recovery reservoir will then flow back into the radiator through the vacuum relief valve in the radiator cap.
When the engine is cold, the coolant level should be between the MAX and MIN marks on the radiator coolant recovery reservoir.