CAUTION: Use only the pressure cap specified for
this vehicle. Use of other pressure caps can lead to
coolant loss and overheating.
DUAL FAN MODULE
All models use electric motor driven fans. The fan
modules include a motor support and shroud. The
module is fastened to the radiator by screws with
square nuts and retaining clips (Fig. 6).
The dual fan module is a combination of 2 fans
mounted in a one piece shroud which operate at two
speeds and are simultaneously activated. The dual
fan system improves engine cooling and air condi-
tioning performance in hot weather and severe driv-
ing conditions, while reducing fan noise and power
consumption. Attempts to reduce high temperature
gauge reading by increasing engine speed, can
increase high temperature.
FAN SHROUD
All vehicles have fan shrouds to improve fan air
flow efficiency. The shroud supports the electric fan
motor and fan.
AUTOMATIC TRANSMISSION OIL COOLER
The transmission oil cooler circuit consists of a
series connected internal cooler mounted inside the
left radiator tank and an auxiliary external oil cooler
mounted to the front of the air conditioning con-
denser (Fig. 7).
Steel tubes and rubber lines supply the oil from
the transmission to the internal oil cooler and return
the oil to the transmission from the auxiliary exter-
nal oil cooler.
Use only approved transmission oil cooler hoses.
Since these hoses are molded to fit space available,
molded hoses are required. The steel tubes must be
flared to ensure sealing of the hose. Torque oil cooler
hose clamps to 2.5 N·m (22 in. lbs.).
ENGINE OIL COOLER
The 3.5L engine uses an engine oil cooler that is
mounted inside the right radiator tank. An oil cooler
pressure control valve is used to control pressure to
the cooler. Engine oil travels from the control valve
through the supply line and into the cooler. The
engine oil exits the cooler through the oil return line
and is returned to the engine oil pan (Fig. 8).
ENGINE BLOCK HEATER
On all models an engine block heater is available
as an optional accessory. The heater, operated by
ordinary house current (110 Volt A.C.) through a
power cord and connector behind the radiator grill.
This provides easier engine starting and faster
warm-up when the vehicle is operated in areas hav-
ing extremely low temperatures.
Fig. 5 Pressure Cap and Bottle
Fig. 6 Fan Module
7 - 4
COOLING SYSTEM
300M
GENERAL INFORMATION (Continued)