2003 DODGE RAM Service Repair Manual

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Page 2769 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 123 REAR SILL CROSS BOX - LONG CARGO BOX ONLY
23 - 194 BODY STRUCTUREDR
WELD LOCATIONS (Continued)

Page 2770 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 124 OUTER BOX SIDE PANEL - LONG CARGO BOX ONLY
DRBODY STRUCTURE 23 - 195
WELD LOCATIONS (Continued)

Page 2771 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 125 STAKE POCKET REINFORCEMENTS - LONG CARGO BOX ONLY
Fig. 126 TAILGATE PIVOT REINFORCEMENT - LONG CARGO BOX ONLY
23 - 196 BODY STRUCTUREDR
WELD LOCATIONS (Continued)

Page 2772 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 127 INNER WHEELHOUSE - LONG CARGO BOX ONLY
Fig. 128 OUTER TAILGATE PILLAR - LONG CARGO BOX ONLY
DRBODY STRUCTURE 23 - 197
WELD LOCATIONS (Continued)

Page 2773 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 129 INNER DOOR PANEL - QUAD CAB
23 - 198 BODY STRUCTUREDR
WELD LOCATIONS (Continued)

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DODGE RAM 2003 Service Repair Manual Fig. 130 INNER DOOR PANEL - STANDARD CAB
DRBODY STRUCTURE 23 - 199
WELD LOCATIONS (Continued)

Page 2775 of 2895

DODGE RAM 2003 Service Repair Manual Fig. 131 INNER DOOR PANEL - QUAD CAB
23 - 200 BODY STRUCTUREDR
WELD LOCATIONS (Continued)

Page 2776 of 2895

DODGE RAM 2003 Service Repair Manual HEATING & AIR CONDITIONING
TABLE OF CONTENTS
page page
HEATING & AIR CONDITIONING
DESCRIPTION
DESCRIPTION - HEATER AND AIR
CONDITIONER........................1
DESCRIPTION - COOLING SYSTEM
REQUIREMENT

HEATING & AIR CONDITIONING
TABLE OF CONTENTS
page page
HEATING & AIR CONDITIONING
DESCRIPTION
DESCRIPTION - HEATER AND AIR
CONDITIONER........................1
DESCRIPTION - COOLING SYSTEM
REQUIREMENTS.......................1
DESCRIPTION - REFRIGERANT SYSTEM
SERVICE PORT........................1
OPERATION
OPERATION - HEATER AND AIR
CONDITIONER........................1
OPERATION - REFRIGERANT SYSTEM
SERVICE PORT........................2DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - A/C
PERFORMANCE.......................2
DIAGNOSIS AND TESTING - HEATER
PERFORMANCE.......................5
STANDARD PROCEDURE - DIODE
REPLACEMENT.......................7
SPECIFICATIONS
A/C APPLICATION TABLE................7
SPECIFICATIONS......................8
CONTROLS.............................9
DISTRIBUTION..........................24
PLUMBING.............................31
HEATING & AIR
CONDITIONING
DESCRIPTION
DESCRIPTION - HEATER AND AIR
CONDITIONER
All vehicles are equipped with a common HVAC
housing assembly (Fig. 1). The system combines air
conditioning, heating, and ventilating capabilities in
a single unit housing mounted under the instrument
panel.
DESCRIPTION - COOLING SYSTEM
REQUIREMENTS
To maintain the performance level of the HVAC
system, the engine cooling system must be properly
maintained. The use of a bug screen is not recom-
mended. Any obstructions in front of the radiator or
condenser will reduce the performance of the air con-
ditioning and engine cooling systems.
The engine cooling system includes the heater core
and the heater hoses. Refer to Engine Cooling for
more information before the opening of, or attempt-
ing any service to the engine cooling system.
DESCRIPTION - REFRIGERANT SYSTEM
SERVICE PORT
The two refrigerant system service ports are used
to charge, recover/recycle, evacuate, and test the air
conditioning refrigerant system. Unique service port
coupler sizes are used on the R-134a system, toensure that the refrigerant system is not accidentally
contaminated by the use of the wrong refrigerant
(R-12), or refrigerant system service equipment.
OPERATION
OPERATION - HEATER AND AIR CONDITIONER
The heater air conditioner are blend-air type sys-
tems. In a blend-air system, a blend door controls the
amount of unconditioned air (or cooled air from the
evaporator on models with air conditioning) that is
allowed to flow through, or around, the heater core. A
temperature control knob on the A/C Heater control
panel determines the discharge air temperature by
controlling an electric actuator, which moves the
blend door. This allows an almost immediate control
of the output air temperature of the system.
The mode control knob on the A/C Heater control
panel is used to direct the conditioned air to the
selected system outlets. Both mode control switches
use electric actuators to control the mode doors.
On all vehicles, the outside air intake can be shut
off by selecting the Recirculation Mode with the
mode control knob. This will operate a electric actu-
ated recirculation door that closes off the outside
fresh air intake and recirculates the air that is
already inside the vehicle.
The air conditioner for all models is designed for
the use of non-CFC, R-134a refrigerant. The air con-
ditioning system has an evaporator to cool and dehu-
midify the incoming air prior to blending it with the
heated air. This air conditioning system uses a fixed
orifice tube in the liquid line near the condenser out-
let tube to meter refrigerant flow to the evaporator
DRHEATING & AIR CONDITIONING 24 - 1

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