Chrysler RAM TRUCK 2500 1994 Service Manual page 294

COOLING SYSTEM 7 - 31
WARNING: DO NOT REMOVE CYLINDER BLOCK
DRAIN P L U G S OR L O O S E N RADIATOR DRAIN-
COCK WITH SYSTEM H O T * ' . I D U M r S R PRESSURE,
SERIOUS B U R N S ¥^iml M ' V - * v K C C 2 U R .
Drain sufficient coolant to allow thermostat re­
moval. Refer to Thermostat Replacement. Disconnect
water pump drive belt.
Add coolant to radiator to bring level to within 6.3
mm (1/4 in) of top of thermostat housing.
CAUTION: A v o i d overheating. Do n o t operate e n ­
g i n e for an e x c e s s i v e period of t i m e , © p e n d r a i n -
c o c k immediately after test to eliminate boil over.
Start engine and accelerate rapidly three times, to
approximately 3000 rpm while observing coolant. I f
internal engine combustion gases are leaking into
cooling system, bubbles will appear i n coolant. I f bub­
bles do not appear, internal combustion gas leakage
is not present.
COOLANT RESERVE/OVERFLOW SYSTEM
The coolant reserve/overflow system works i n con­
junction with the radiator pressure cap. I t utilizes
thermal expansion and contraction of coolant to keep
coolant free of trapped air. I t provides a volume for
expansion and contraction of coolant. I t also provides
a convenient and safe method for checking coolant
level and adjusting level at atmospheric pressure.
This is done without removing radiator pressure cap.
I t also provides some reserve coolant to cover minor
leaks and evaporation or boiling losses.
The coolant reserve/overflow tank is mounted to
the fan shroud on all engines except the 8.0L V-10
(Fig. 59). On the 8.0L V-10 engine the tank is
mounted to right inner fender (Fig. 60).
Refer to Coolant Level Check—Service, Deaeration
and Radiator Pressure Cap sections i n this group for
coolant reserve/overflow system operation and ser­
vice.
Should the reserve/overflow tank become coated
with corrosion, i t can be cleaned with detergent and
water. Rinse tank thoroughly before refilling cooling
system as described in the Coolant section of this
group.
T A N K REMOVAL—ALL &XGEPT i ^ L V - f O
ENGINE
(1) Remove overflow hose from radiator.
(2) Unsnap the coolant reserve/overflow tank from
fan shroud. Lift straight up. The fan shroud is
equipped with T-shaped slots (Fig. 59) to attach the
tank. A n alignment pin is located on the side of tank.
INSTALLATION
(1) Snap the tank into the two T-siots and the
alignment pin on fan shroud.
Fig. 59 Coolant Reserve/Overflow Tank—All Except
8.0L V-10 Engine
C O O L A N T
RESERVE/OVERFLOW
BOLTS (2) J948D-21
Fig. 60 Coolant Reserve/Overflow Tank—8.0L V-10
Engine
(2) Connect overflow hose to radiator.
TANK REMOVAL—8.0L V-10 ENGINE
(1) Remove overflow hose from radiator.
(2) Remove three tank mounting bolts (Fig. 60)
and remove tank.
INSTALLATION
(1) Position tank to inner fender.
(2) Install bolts and tighten to 6 N-m (50 in. lbs.)
torque.
(3) Connect overflow hose to radiator.