Description-3.0L Diesel

Fig 1: Coolant Reservoir/Overflow Tank - 3.0L

Courtesy of CHRYSLER LLC

This system works on the principal of a closed and deaerated system using thermally generated pressure. The expansion and contraction of the coolant in the pressurized closed system keeps it free of trapped air. It provides:

1. A pressurized surge tank (1) volume for expansion and contraction.
2. A non-pressurized overflow volume to capture excess coolant expansion and allow for it's return to the pressurized system.
3. A pressurized cap on the pressure bottle rather then the radiator. This facilitates deaeration of the system.
4. Reserve coolant is included in the pressurized volume to account for minor leaks and evaporation or boiling losses.
5. Provides a warning light for low coolant level.