Radiator Fan - Chrysler 2004 Concorde Service Manual

7 - 30 ENGINE
PRESSURE CAP (Continued)
Fig. 21 PRESSURE CAP
1 - MAIN SPRING
2 - GASKET RETAINER
3 - STAINLESS STEEL SWIVEL TOP
4 - RUBBER SEALS
5 - SPRING LOADED VALVE
6 - COOLANT PRESSURE BOTTLE
7 - FILLER NECK
8 - OVERFLOW NIPPLE
ket has swollen and prevents the valve from closing,
replace the cap.
Hold the cap in hand upside down. If any light
can be seen between vent valve and rubber gasket,
replace cap.
There is no need to remove the pressure cap at any
time except for the following purposes:
• Checking and adjust antifreeze freeze point.
• Refilling system with new coolant.
• Conducting service procedures.
• Checking for vacuum leaks.

RADIATOR FAN

DESCRIPTION
The radiator fan assembly includes two electric
motors, a motor support, and a one piece shroud. The
assembly is fastened to the radiator by screws with
square nuts and retaining clips (Fig. 22).
OPERATION
The cooling system fans will operate at two speeds
and are simultaneously activated. The dual fan sys-
tem improves engine cooling and air conditioning
performance in hot weather and severe driving con-
ditions, while reducing fan noise and power consump-
tion.
The cooling fans will operate based on inputs to
the Powertrain Control Module (PCM). When fan
operation is determined necessary, the PCM provides
a ground to the fan relay control circuit.
Fig. 22 RADIATOR FAN
1 - ELECTRICAL CONNECTOR
2 - FASTENERS
3 - CLIPS
The inputs provided to the PCM that influence fan
operation are:
• Coolant Temperature Sensor
• Intake Air Temperature Sensor
• Output Speed Sensor
• Transmission Oil Temperature Sensor
• A/C Pressure Transducer
For more information (Refer to 7 - COOLING/EN-
GINE/RADIATOR FAN RELAY - OPERATION).
DIAGNOSIS AND TESTING - RADIATOR FAN
CONTROL
Radiator fan control can be accomplished five
ways. A pressure transducer on the air conditioning
compressor discharge line sends a signal to the Pow-
ertrain Control Module (PCM) which will activate
both fans if necessary. In addition to this control, the
fans are turned on based on coolant temperature sen-
sor, intake air temperature sensor, output speed sen-
sor, and transmission oil temperature sensor output
to the PCM. The PCM switches the fans on through
the fan relays.
The PCM provides fan control for the following
conditions:
• Regardless of coolant temperature the fan will
not run during cranking until the engine starts.
• Fans will run in accordance with the specifica-
tions listed in the following operation charts.
For additional circuit and diagnostic information
(Refer to Appropriate Wiring and Diagnostic Informa-
tion).
LH