Service Procedures; Coolant Level Check; Draining Cooling System; Refilling Cooling System - Jeep 1997 Grand Cherokee Service Manual

ZG

SERVICE PROCEDURES

COOLANT LEVEL CHECK

The coolant level is checked and adjusted at the
pressurized coolant tank. The tank is located at the
right-rear side of the engine compartment and is
mounted as the highest point of the cooling system.
This will allow any air or vapor exceeding the pres-
sure/vent cap rating to escape through the cap. The
coolant tank is equipped with a cam type pressure/
vent cap. Refer to Pressure/Vent Cap for additional
information.
A coolant reserve/overflow system with a separate
tank is not used with the 2.5L diesel engine.
(1) Add coolant into the coolant tank up to the
COLD mark. If possible, only add coolant when
the engine is cold. Coolant level in a warm
engine will be higher in the tank due to ther-
mal expansion.
(2) After the engine has been operated through a
few heat-up and cool-down cycles, recheck the coolant
level in the tank.

DRAINING COOLING SYSTEM

The cooling system is equipped with a pressurized
coolant tank using a pressure/vent cap.
WARNING: DO NOT REMOVE THE CYLINDER
BLOCK DRAIN-PLUG, THE COOLANT TANK CAP,
THE RADIATOR FILL VENT VALVE, OR LOOSEN
THE RADIATOR DRAINCOCK WITH THE SYSTEM
HOT AND PRESSURIZED. SERIOUS BURNS FROM
THE COOLANT CAN OCCUR.
WARNING: IF VEHICLE
RECENTLY, WAIT AT LEAST 15 MINUTES BEFORE
REMOVING COOLANT TANK CAP. WITH A RAG,
SQUEEZE THE UPPER RADIATOR HOSE TO CHECK
IF SYSTEM IS UNDER PRESSURE. PLACE A RAG
OVER THE CAP. VERY SLOWLY ROTATE THE CAP
COUNTERCLOCKWISE ALLOWING PRESSURE TO
SLOWLY RELEASE. AFTER ALL PRESSURE HAS
BEEN RELEASED, REMOVE THE COOLANT TANK
CAP COMPLETELY.
DO NOT WASTE reusable coolant. If the solution
is clean, drain the coolant into a clean container for
reuse.
HAS BEEN RUN
(1) Observe the previous WARNINGS and remove
the coolant tank pressure/vent cap.
(2) The plastic radiator draincock is located on the
bottom of the left radiator tank. It can be accessed
from the bottom of vehicle.
(a) Attach one end of a 24 inch long X 1/4 inch
ID drain-hose to the nipple below the radiator
draincock.
(b) Put the other end of drain-hose into a clean
container.
(c) Open the draincock (counterclockwise as
viewed from left side of vehicle) and drain coolant
from radiator.
(3) If the complete cooling system must be drained,
raise the vehicle and remove the cylinder block
drain-plug (Fig. 12). This hex- headed plug is located
on the right/rear side of the engine above the starter
motor.
Fig. 12 Cylinder Block Drain-Plug

REFILLING COOLING SYSTEM

The cooling system is equipped with a pressurized
coolant tank using a pressure/vent cap. Refilling of
the system is done through this tank.
NOTE: The radiator draincock is equipped with a
rubber o-ring. Do not over tighten draincock.
COOLING SYSTEM 7 - 17