OPERATION-NON PRESSURE SYSTEM
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.
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.
REMOVAL
REMOVAL-NON PRESSURE SYSTEM
Fig. 37: Identifying Radiator Pressure Cap, Hose & Coolant Recovery Bottle
Courtesy of CHRYSLER LLC
1 - RADIATOR PRESSURE CAP
2007 Dodge Nitro R/T
2007 ENGINE Cooling - Nitro