Coolant Recovery System

PURPOSE
The coolant reserve/overflow system works in conjunction with the radiator pressure cap. It utilizes thermal expansion and contraction of coolant to keep coolant free of trapped air. It provides a volume for expansion and contraction of coolant. It also provides a convenient and safe method for checking coolant level and adjusting level at atmospheric pressure. This is done without removing the radiator pressure cap. The system also provides some reserve coolant to the radiator to cover minor leaks and evaporation or boiling losses.

OPERATION
As the engine cools, a vacuum is formed in the cooling system of both the radiator and engine. Coolant will then be drawn from the coolant tank and returned to a proper level in the radiator.

Coolant Reserve/Overflow Tank-All Except 8.0L V-10 Engine:

Coolant Reserve/Overflow Tank-8.0L V-10 Engine:

On 3.9L/5.2L/5.9L. gas engines and the 5.9L diesel engine, the coolant reserve/overflow tank is mounted to the side of the fan shroud. On the 8.0L V-10 engine the tank is mounted to right inner fender.

CLEANING
Should the reserve/overflow tank become coated with corrosion, it can be cleaned with detergent and water. Rinse tank thoroughly before refilling cooling system.