2001 DODGE RAM Ac control

(10) Lift radiator straight up and out of engine
compartment. The bottom of the radiator is equipped
with two alignment dowels that fit into holes in the
lower radiator support panel (Fig. 42). Rubber bis-
cuits (insulators) are installed to these dowels. Take
care not to damage cooling fins or tubes on the radi-
ator and air conditioning condenser when removing.
CLEANING
Clean radiator fins are necessary for good heat
transfer. The radiator and air conditioning fins
should be cleaned when an accumulation of debris
has occurred. With the engine cold, apply cold water
and compressed air to the back (engine side) of the
radiator to flush the radiator and/or A/C condenser of
debris.
INSPECTION
Inspect the radiator side tanks for cracks, broken
or missing fittings also inspect the joint where the
tanks seam up to the radiator core for signs of leak-
age and/or deteriorating seals.
Inspect radiator core for corroded, bent or missing
cooling fins. Inspect the core for bent or damaged
cooling tubes.
INSTALLATION
(1) Position fan shroud over the fan blades rear-
ward towards engine.
(2) Install rubber insulators to alignment dowels
at lower part of radiator.
(3) Lower the radiator into position while guiding
the two alignment dowels into lower radiator sup-
port. Different alignment holes are provided in the
lower radiator support for each engine application.
(4) Install two upper radiator mounting bolts.
Tighten bolts to 11 N´m (95 in. lbs.) torque.
(5) Connect both radiator hoses and install hose
clamps.
(6) Connect transmission cooler lines to radiator
tank. Inspect quick connect fittings for debris and
install until an audible ªclickº is heard. Pull apart to
verify connection.
(7) Install windshield washer reservoir tank.
(8) Position fan shroud to flanges on sides of radi-
ator. Install fan shroud mounting bolts (Fig. 41).
Tighten bolts to 6 N´m (50 in. lbs.) torque.
(9) Install metal clips to top of fan shroud.
(10) Install coolant reserve/overflow tank hose to
radiator filler neck nipple.
(11) Install coolant reserve/overflow tank to fan
shroud (fits into T-slots on shroud).
(12) Install battery negative cables.
(13) Install positive battery cable to top of radia-
tor. Tighten radiator-to-battery cable mounting nuts.
(14) Position heater controls tofull heatposition.(15) Fill cooling system with coolant (Refer to 7 -
COOLING - STANDARD PROCEDURE).
(16) Operate engine until it reaches normal tem-
perature. Check cooling system and automatic trans-
mission (if equipped) fluid levels.
RADIATOR PRESSURE CAP
DESCRIPTION
Radiators are equipped with a pressure cap, which
releases pressure at some point within a range of
97-124 kPa (14-18 psi). The pressure relief point (in
pounds) is engraved on top of cap.
The cooling system will operate at pressures
slightly above atmospheric pressure. This results in a
higher coolant boiling point allowing increased radi-
ator cooling capacity.
A rubber gasket seals radiator filler neck to pre-
vent leakage. This is done to keep system under
pressure. It also maintains vacuum during coolant
cool-down allowing coolant to return from reserve/
overflow tank.
OPERATION
The cap (Fig. 43) contains a spring-loaded pressure
relief valve that opens when system pressure reaches
release range of 97-124 kPa (14-18 psi).
A vent valve in the center of cap allows a small
coolant flow through cap when coolant is below boil-
ing temperature. The valve is completely closed when
boiling point is reached. As the coolant cools, it con-
Fig. 43 Radiator Pressure Cap and Filler NeckÐ
Typical
1 - STAINLESS-STEEL SWIVEL TOP
2 - RUBBER SEALS
3 - VENT VALVE
4 - RADIATOR TANK
5 - FILLER NECK
6 - OVERFLOW NIPPLE
7 - MAIN SPRING
8 - GASKET RETAINER
BR/BEENGINE 7 - 65
RADIATOR - 5.9L DIESEL (Continued)

(4) Disconnect the coolant reserve/overflow tank-
to-radiator hose at the tank.
(5) Remove the four fan shroud mounting bolts at
the radiator (Fig. 47). Do not attempt to remove
shroud from vehicle at this time.
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20)
MAY BE USED FOR LARGER CLAMPS. ALWAYS
WEAR SAFETY GLASSES WHEN SERVICING CON-
STANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps . If replacement
is necessary, use only an original equipment clamp
with a matching number or letter.
(6) Remove upper radiator hose at radiator.
(7) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft (Fig. 49).
Remove the fan/fan drive assembly from water pump
by turning the mounting nut counterclockwise (as
viewed from front). Threads on the fan drive are
RIGHT-HAND.A Snap-On 36 MM Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool
Set number 2017DSP) can be used with Special Tool
6958 Spanner Wrench and Adapter Pins 8346 (Fig.
48) to prevent the pulley from rotating.(8) If water pump is being replaced, do not unbolt
fan blade assembly (Fig. 49) from the thermal control
fan drive.
(9) Remove fan blade/fan drive and fan shroud as
an assembly from vehicle.
(10) After removing fan blade/fan drive assembly,
do notplace the thermal viscous fan drive in the
horizontal position. If stored horizontally, the silicone
fluid in the viscous drive could drain into its bearing
assembly and contaminate the bearing lubricant.
(11) Remove accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL) (Fig. 50).
(12) Remove the lower radiator hose and heater
hose from water pump.
(13) Loosen heater hose coolant return tube
mounting bolt (Fig. 51) and remove tube from water
pump. Discard the old tube O-ring.
(14) Remove the seven water pump mounting bolts
(Fig. 52).
(15) Loosen the clamp at the water pump end of
bypass hose (Fig. 49). Slip the bypass hose from the
water pump while removing pump from vehicle. Do
not remove the clamp from the bypass hose.
(16) Discard old gasket.
CAUTION: Do not pry the water pump at timing
chain case/cover. The machined surfaces may be
damaged resulting in leaks.
Fig. 47 Typical Fan Shroud Mounting
1 - RADIATOR SUPPORT
2 - RADIATOR
3 - BOLTS (4)
4 - FAN SHROUDFig. 48 Using Special Tool 6958 Spanner Wrench
and Adapter Pins 8346
1 - SPECIAL TOOL 6958 SPANNER WRENCH WITH ADAPTER
PINS 8346
2-FAN
7 - 68 ENGINEBR/BE
WATER PUMP - 3.9L/5.2L/5.9L (Continued)

CAUTION: A number or letter is stamped into the
tongue of constant tension clamps. If replacement
is necessary, use only an original equipment clamp
with a matching number or letter.
(5) Remove radiator upper hose at radiator.
(6) The thermal viscous fan drive is attached
(threaded) to the water pump hub shaft (Fig. 55).
Remove the fan/fan drive assembly from water pump
by turning the mounting nut counterclockwise (as
viewed from front). Threads on the fan drive are
RIGHT-HAND.A Snap-On 36 MM Fan Wrench
(number SP346 from Snap-On Cummins Diesel Tool
Set number 2017DSP) can be used with Special Tool
6958 Spanner Wrench and Adapter Pins 8346 (Fig.
54) to prevent the pulley from rotating.
(7) If water pump is being replaced, do not unbolt
fan blade assembly (Fig. 55) from the thermal control
fan drive.
(8) Remove fan blade/fan drive and fan shroud as
an assembly from vehicle.
After removing fan blade/fan drive assembly,do
notplace the thermal viscous fan drive in the hori-
zontal position. If stored horizontally, the silicone
fluid in the viscous drive could drain into its bearing
assembly and contaminate the bearing lubricant.(9) Remove accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL) (Fig. 56).
(10) Remove the radiator lower hose at water
pump.
Fig. 54 Using Special Tool 6958 Spanner Wrench
and Adapter Pins 8346
1 - SPECIAL TOOL 6958 SPANNER WRENCH WITH ADAPTER
PINS 8346
2-FAN
Fig. 55 Fan Blade and Viscous Fan DriveÐTypical
1 - WATER PUMP BYPASS HOSE
2 - FAN BLADE ASSEMBLY
3 - VISCOUS FAN DRIVE
4 - WATER PUMP AND PULLEY
Fig. 56 Belt TensionerÐ8.0L V-10 Engine
1 - PULLEY BOLT
2 - IDLER PULLEY
3 - TENSIONER PULLEY
4 - TENSIONER
5 - TENSIONER MOUNTING BOLT
BR/BEENGINE 7 - 71
WATER PUMP - 8.0L (Continued)

(2) Do not waste reusable coolant. If the solution is
clean, drain the coolant into a clean container for
reuse.
(3) Remove upper radiator hose clamp at radiator.
A special clamp tool must be used to remove the con-
stant tension clamps. Remove hose at radiator.
(4) Disconnect throttle cable from clip at radiator
fan shroud.
(5) Unplug wiring harness from A/C compressor.
(6) Remove the air cleaner assembly.
(7) Remove accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(8)3.9L V-6 or 5.2/5.9L V-8 LDC-Gas:The drive
belt idler pulley must be removed to gain access to
one of the A/C compressor/generator bracket mount-
ing bolts. Remove the idler pulley bolt and remove
idler pulley (Fig. 64).
(9)5.9L HDC-Gas:The automatic belt tensioner/
pulley assembly must be removed to gain access to
one of the A/C compressor/generator bracket mount-
ing bolts. Remove the tensioner mounting bolt (Fig.
65) and remove tensioner.(10) Remove the engine oil dipstick tube mounting
bolt at the side of the A/C-generator mounting
bracket.
(11) Disconnect throttle body control cables.
(12) Remove heater hose coolant return tube
mounting bolt (Fig. 66) (Fig. 67) and remove tube
from engine. Discard the old tube O-ring.
(13) Remove bracket-to-intake manifold bolts
(number 1 and 2 (Fig. 63).
(14) Remove remaining bracket-to-engine bolts
(Fig. 68) (Fig. 69).
(15) Lift and position generator and A/C compres-
sor (along with their common mounting bracket) to
gain access to bypass hose. A block of wood may be
used to hold assembly in position.
(16) Loosen and position both hose clamps to the
center of bypass hose. A special clamp tool must be
used to remove the constant tension clamps. Remove
hose from vehicle.
Fig. 64 Idler PulleyÐ3.9L V-6 or 5.2/5.9L V-8
LDC-Gas Engines
Fig. 65 Belt TensionerÐ5.9L HDC-Gas Engine
1 - PULLEY BOLT
2 - IDLER PULLEY
3 - TENSIONER PULLEY
4 - TENSIONER
5 - TENSIONER MOUNTING BOLT
BR/BEENGINE 7 - 75
WATER PUMP INLET TUBE - 3.9L/5.2L/5.9L (Continued)

REMOVALÐWATER PUMP BYPASS HOSE
WITHOUT AIR CONDITIONING
A water pump bypass hose (Fig. 70) is used
between the intake manifold and water pump on all
gas powered engines. To test for leaks, refer to Test-
ing Cooling System for Leaks in this group.
(1) Partially drain cooling system (Refer to 7 -
COOLING - STANDARD PROCEDURE). Do not
waste reusable coolant. If the solution is clean, drain
the coolant into a clean container for reuse.
WARNING: CONSTANT TENSION HOSE CLAMPS
ARE USED ON MOST COOLING SYSTEM HOSES.
WHEN REMOVING OR INSTALLING, USE ONLY
TOOLS DESIGNED FOR SERVICING THIS TYPE OF
CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER
6094). SNAP-ON CLAMP TOOL (NUMBER HPC-20)
MAY BE USED FOR LARGER CLAMPS. ALWAYS
WEAR SAFETY GLASSES WHEN SERVICING CON-
STANT TENSION CLAMPS.
CAUTION: A number or letter is stamped into the
tongue of constant tension clamps. If replacement
is necessary, use only an original equipment clamp
with a matching number or letter.
(2) Loosen both bypass hose clamps and position to
the center of hose.
(3) Remove hose from vehicle.
INSTALLATIONÐWATER PUMP BYPASS HOSE
WITH AIR CONDITIONING
(1) Position bypass hose clamps to the center of
hose.
(2) Install bypass hose to engine.
(3) Secure both hose clamps.
(4) Install generator-A/C mounting bracket assem-
bly to engine. Tighten bolt number 1 (Fig. 63) to 41
N´m (30 ft. lbs.) torque. Tighten bolt number 2 (Fig.
63) to 28 N´m (20 ft. lbs.) torque. Tighten bracket
mounting bolts (Fig. 68) (Fig. 69) to 40 N´m (30 ft.
lbs.) torque.
(5) Install a new O-ring to the heater hose coolant
return tube (Fig. 66) (Fig. 67). Coat the new O-ring
with antifreeze before installation.
(6) Install coolant return tube and its mounting
bolt to engine (Fig. 66) (Fig. 67).
(7) Connect throttle body control cables.
(8) Install oil dipstick mounting bolt.
(9)3.9L V-6 or 5.2/5.9L V-8 LDC-Gas Engines:
Install idler pulley. Tighten bolt to 41 N´m (30 ft.
lbs.) torque.
(10)5.9L HDC-Gas:Install automatic belt ten-
sioner assembly to mounting bracket. A dowel pin is
located on back of tensioner (Fig. 71). Align this to
dowel hole (Fig. 72) in tensioner mounting bracket.
Tighten bolt to 41 N´m (30 ft. lbs.) torque.
(11) Install drive belt (Refer to 7 - COOLING/AC-
CESSORY DRIVE/DRIVE BELTS - INSTALLA-
TION).
Fig. 71 Tensioner Dowel PinÐ5.9L HDC-Gas Engine
1 - BELT TENSIONER
2 - DOWEL PIN
Fig. 70 Water Pump Bypass HoseÐTypical
1 - WATER PUMP BYPASS HOSE
2 - FAN BLADE ASSEMBLY
3 - VISCOUS FAN DRIVE
4 - WATER PUMP AND PULLEY
BR/BEENGINE 7 - 77
WATER PUMP INLET TUBE - 3.9L/5.2L/5.9L (Continued)

TRANSMISSION
TABLE OF CONTENTS
page page
TRANS COOLER - 3.9L/5.2L/5.9L
DESCRIPTION...........................79
OPERATION.............................79
STANDARD PROCEDURE..................79
FLUSHING COOLERS AND TUBES - WITH
RADIATOR IN-TANK TRANSMISSION OIL
COOLER..............................79
FLUSHING COOLER AND TUBES -
WITHOUT RADIATOR IN-TANK
TRANSMISSION OIL COOLER.............80
REMOVAL..............................81
DISASSEMBLY...........................81
ASSEMBLY.............................82
INSTALLATION...........................82
TRANS COOLER - 8.0L
DESCRIPTION...........................82
OPERATION.............................82
STANDARD PROCEDURE..................83
FLUSHING COOLERS AND TUBES - WITH
RADIATOR IN-TANK TRANSMISSION OIL
COOLER..............................83FLUSHING COOLER AND TUBES -
WITHOUT RADIATOR IN-TANK
TRANSMISSION OIL COOLER.............83
REMOVAL..............................84
INSTALLATION...........................85
TRANS COOLER - 5.9L DIESEL
DESCRIPTION...........................85
OPERATION.............................85
STANDARD PROCEDURE..................85
FLUSHING COOLERS AND TUBES - WITH
RADIATOR IN-TANK TRANSMISSION OIL
COOLER..............................85
FLUSHING COOLER AND TUBES -
WITHOUT RADIATOR IN-TANK
TRANSMISSION OIL COOLER.............86
REMOVAL..............................87
INSTALLATION...........................88
TRANS COOLER - 3.9L/5.2L/
5.9L
DESCRIPTION
An air-to-oil transmission oil cooler is standard on
all engine packages. the cooler is located between the
radiator and air conditioning condenser (Fig. 1).
OPERATION
The transmission oil is routed through the cooler
where heat is removed from the transmission oil
before returning to the transmission. The cooler has
an internal thermostat that controls fluid flow
through the cooler. When the transmission fluid is
cold ( less than operating temperature) the fluid is
routed through the cooler bypass. when the transmis-
sion fluid reaches operating temperatures and above,the thermostat closes off the bypass allowing fluid
flow through the cooler. The thermostat MUST be
removed from the cooler before the cooler can be
flushed. The thermostat is serviceable.
STANDARD PROCEDURE - FLUSHING
COOLERS AND TUBES - WITH RADIATOR
IN-TANK TRANSMISSION OIL COOLER
When a transmission failure has contaminated the
fluid, the oil cooler(s) must be flushed. The torque
converter must also be replaced. This will insure that
metal particles or sludged oil are not later trans-
ferred back into the reconditioned (or replaced) trans-
mission.
The only recommended procedure for flushing cool-
ers and lines is to use Tool 6906-B Cooler Flusher.
BR/BETRANSMISSION 7 - 79

(2) Reinstall filler plug on Tool 6906B.
(3) Verify pump power switch is turned OFF. Con-
nect red alligator clip to positive (+) battery post.
Connect black (-) alligator clip to a good ground.
(4) Disconnect the cooler lines at the transmission.
NOTE: When flushing transmission cooler and
lines, ALWAYS reverse flush.
NOTE: The converter drainback valve must be
removed and an appropriate replacement hose
installed to bridge the space between the transmis-
sion cooler line and the cooler fitting. Failure to
remove the drainback valve will prevent reverse
flushing the system. A suitable replacement hose
can be found in the adapter kit supplied with the
flushing tool.
(5) Connect the BLUE pressure line to the OUT-
LET (From) cooler line.
(6) Connect the CLEAR return line to the INLET
(To) cooler line
(7) Remove the transmission oil cooler from the
vehicle. (Refer to 7 - COOLING/TRANSMISSION/
TRANS COOLER - REMOVAL)
(8) Remove the transmission oil cooler thermostat.
(Refer to 7 - COOLING/TRANSMISSION/TRANS
COOLER - DISASSEMBLY)
(9) Re-install the thermostat cover onto the oil
cooler and install the snap-ring.
(10) Re-connect the oil cooler to the transmission
cooler lines.
(11) Turn pump ON for two to three minutes to
flush cooler(s) and lines.
NOTE: This flushes the bypass circuit of the cooler
only.
(12) Turn pump OFF.
(13) Remove the thermostat cover from the oil
cooler.
(14) Install Special Tool Cooler Plug 8414 into the
transmission oil cooler.
(15) Re-install the thermostat cover onto the oil
cooler and install the snap-ring.
(16) Turn pump ON for two to three minutes to
flush cooler(s) and lines.
NOTE: This flushes the main oil cooler core pas-
sages only.
(17) Turn pump OFF.
(18) Remove the thermostat cover from the oil
cooler.
(19) Remove Special Tool Cooler Plug 8414 from
the transmission oil cooler.(20) Install a new thermostat spring, thermostat,
cover, and snap-ring into the transmission oil cooler.
(Refer to 7 - COOLING/TRANSMISSION/TRANS
COOLER - ASSEMBLY)
(21) Install the transmission oil cooler onto the
vehicle. (Refer to 7 - COOLING/TRANSMISSION/
TRANS COOLER - INSTALLATION)
(22) Disconnect CLEAR suction line from reservoir
at cover plate. Disconnect CLEAR return line at
cover plate, and place it in a drain pan.
(23) Turn pump ON for 30 seconds to purge flush-
ing solution from cooler and lines. Turn pump OFF.
(24) Place CLEAR suction line into a one quart
container of MopartATF +4, type 9602, Automatic
Transmission fluid.
(25) Turn pump ON until all transmission fluid is
removed from the one quart container and lines. This
purges any residual cleaning solvent from the trans-
mission cooler and lines. Turn pump OFF.
(26) Disconnect alligator clips from battery. Recon-
nect flusher lines to cover plate, and remove flushing
adapters from cooler lines.
REMOVAL
(1) Disconnect battery negative cable.
(2) Place a drain pan under the oil cooler lines.
(3) Disconnect the transmission oil cooler line
quick-connect fitting at the cooler outlet using the
quick connect release tool 6935. Loosen clamp from
inlet connection and slide hose off of nipple. Plug
cooler lines to prevent oil leakage.
(4) Remove the oil cooler lower mounting bolt (oil
cooler-to-vehicle body) (Fig. 2).
(5) Remove three bolts (radiator support bracket-
to-body) . Remove this A-shaped support bracket and
the transmission oil cooler as an assembly from the
vehicle. Take care not to damage the radiator core or
A/C condenser fins with the cooling lines when
removing.
(6) Remove oil cooler from A-shaped support
bracket by removing two upper mounting strap bolts
and mounting straps at support bracket (Fig. 2).
(7) Remove oil cooler from the A-shaped radiator
support bracket.
DISASSEMBLY
NOTE: The transmission oil cooler uses an internal
thermostat to control transmission oil flow through
the cooler. This thermostat is servicable.
(1) Remove the transmission oil cooler (Refer to 7 -
COOLING/TRANSMISSION/TRANS COOLER -
REMOVAL).
(2) Remove the snap ring retaining the thermostat
end plug (Fig. 3).
BR/BETRANSMISSION 7 - 81
TRANS COOLER - 3.9L/5.2L/5.9L (Continued)

Refer to Electrical, Restraints for more information
on the clockspring. Refer to Electrical, Body Control/
Central Control Module for more information on the
Central Timer Module. Refer to the appropriate wir-
ing information. The wiring information includes wir-
ing diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds. Following are general descriptions of
the remaining major components in the standard and
optional factory-installed audio systems.
OPERATION
See the owner's manual in the vehicle glove box for
more information on the features, use and operation
of each of the available audio systems.
CENTRAL TIMER MODULE
The high-line or premium Central Timer Module
(CTM) can also control some features of the audio
system when the vehicle is equipped with the
optional RAZ radio receiver and remote radio
switches. A high-line CTM is used on high-line ver-
sions of this vehicle. A premium CTM is used on
vehicles equipped with the optional heated seats. The
CTM combines the functions of a chime/buzzer mod-
ule, an intermittent wipe module, an illuminated
entry module, a remote keyless entry module, and a
vehicle theft security system module in a single unit.
The high-line or premium CTM also controls and
integrates many of the additional electronic functions
and features included on models with this option.The RAZ radio receiver with a remote radio switch
option is one of the features that the CTM controls.
The CTM is programmed to send switch status mes-
sages over the Chrysler Collision Detection (CCD)
data bus to control the volume, seek, and pre-set sta-
tion advance functions of the RAZ radio receiver. The
CTM monitors the status of the remote radio
switches located on the steering wheel through a
hard wired circuit. The CTM then sends the proper
switch status messages to the radio receiver. The
electronic circuitry within the radio receiver responds
to the switch status messages it receives by adjusting
the radio settings as requested.
Refer to Electrical, Body Control/Central Timer
Module for more information on the high-line CTM.
Refer to Remote Radio Switch in Description and
Operation for more information on this component.
In addition, radio receivers connected to the CCD
data bus have several audio system functions that
can be diagnosed using a DRBIIItscan tool. Refer to
the proper Diagnostic Procedures manual for more
information on DRBIIIttesting of the audio systems.
DIAGNOSIS AND TESTING - AUDIO
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
8A - 2 AUDIOBR/BE
AUDIO (Continued)