Item
Part Number
Description
1
-
Radiator upper support bracket
2
-
Radiator
3
-
Twin fan control module
4
-
High speed ram flaps (4 off)
5
-
Fan shroud
6
-
Electric fan
7
-
Radiator lower support bracket
8
-
Fan motor
9
-
Coolant drain point
10
-
Radiator lower support bush
The radiator is a right to left cross-flow type comprising an aluminum matrix. The bottom of the radiator is located in
rubber bushes, and supported by a steel bracket screwed to the body longitudinal end plates. The top of the radiator is
located in rubber bushes and is secured by brackets attached to the hood locking platform.
A hose connection on each side of the radiator provides the attachment for the top and bottom hose. A small diameter
port in the top RH side provides a degas line connection to the coolant reservoir. A coolant drain point is provided on the
bottom LH side of the radiator.
The rear of the radiator is covered with a fan shroud that also provides the mounting location for the twin fans and fan
control module. The 4 high speed ram flaps located on the shroud are provided to assist the flow of cooling air into the
engine compartment, regardless of fan operation. The ram flaps are operated by the ram air effect as air enters through
the front grille. The ram flaps open when air speed through the radiator is sufficient to overcome the flap closing force.
On vehicles installed with AW F21 automatic transmission, the transmission fluid is cooled by an oil cooler mounted to the
rear LH side of the radiator. The cooler is connected into the LH top third of the radiator (cold side) and causes a
restriction to the flow of coolant across this portion of the radiator. As the coolant flow is restricted, the coolant travels at
a slower rate creating a low temperature zone. This cools the coolant in that portion of the radiator more than the lower
portion to provide increased cooling of the transmission oil.
For additional information, refer to:
Transmission Cooling
(307-02 Transmission/Transaxle Cooling, Description and
Operation).
TWIN ELECTRIC FAN ASSEMBLY
A twin electric fan assembly is mounted to the fan shroud and attached to the rear of the radiator. The fans draw air
through the radiator to regulate the coolant temperature, and provide cooling air through the engine compartment.
The fans are operated by the fan control module that receives a 0 to 100% Pulse W idth Modulation (PW M) frequency signal
from the ECM. The ECM varies the PWM signal based on inputs from various sensors. The fan control module uses the PWM
signal to determine the required output voltage to the 2 cooling fan motors.
For additional information, refer to: Electronic Engine Controls - 2.2L Diesel (303-14 Electronic Engine Controls - 2.2L
Diesel, Description and Operation).
Following certain engine operating conditions and with the ignition switched off, the fans will continue to operate under
the control of the ECM to maintain engine cooling.
ENGINE OIL COOLER