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Contents

Wiring diagrams Section: Heating & Air Conditioning - Service Information

HEATER AND AIR CONDITIONER

A/C PERFORMANCE

HEATER PERFORMANCE

OBSTRUCTED COOLANT FLOW

MECHANICAL PROBLEMS

TEMPERATURE CONTROL

HEATING AND AIR CONDITIONING SYSTEM

A/C SYSTEM

BLEND DOOR ACTUATOR

MODE DOOR ACTUATOR

RECIRCULATION DOOR ACTUATOR

CLUTCH-A/C COMPRESSOR

A/C COMPRESSOR CLUTCH/COIL

PRELIMINARY CHECKS

A/C COMPRESSOR CLUTCH

DENSO A/C COMPRESSOR

CONTROL-A/C HEATER

RESISTOR-BLOWER MOTOR

SENSOR-EVAPORATOR TEMPERATURE

A/C PRESSURE TRANSDUCER

TRANSDUCER-A/C PRESSURE

DOOR-RECIRCULATION-AIR

DEFROSTER DUCT

DUCT-FLOOR CONSOLE

FLOOR DISTRIBUTION DUCTS

PANEL DOOR

INSTRUMENT PANEL DEMISTER DUCTS

HOUSING-AIR INLET

HOUSING-HVAC

MOTOR-BLOWER

BLOWER MOTOR

OUTLETS-AIR-FRONT PASSENGER

OUTLETS-AIR-REAR SEAT

REFRIGERANT LINES

WARNING

CAUTION

REFRIGERANT SYSTEM LEAKS

SYSTEM EMPTY

SYSTEM LOW

REFRIGERANT SYSTEM CHARGE

CHARGING PROCEDURE

REFRIGERANT SYSTEM EVACUATE

REFRIGERANT SYSTEM RECOVERY

SERVICE EQUIPMENT

MANIFOLD GAUGE SET CONNECTIONS

ACCUMULATOR

VALVE-HIGH PRESSURE RELIEF-A/C COMPRESSOR

COMPRESSOR-A/C

3.7L/4.7L ENGINES

5.7L ENGINE

5.9L/6.7L DIESEL ENGINES

A/C CONDENSER

CONDENSER-A/C

3.7L/4.7L/5.7L ENGINES

CORE-HEATER

HEATER CORE

SERVICE PORT VALVE CORE

CORE-VALVE-SERVICE PORT

COUPLER- REFRIGERANT LINE

EVAPORATOR-A/C

A/C EVAPORATOR

A/C CONDENSER FAN (3.7L/4.7L/5.7L ENGINES)

A/C CONDENSER FAN (3.7L/4.7L/5.7L ENGINE)

A/C DISCHARGE LINE

LINE-A/C LIQUID

REAR SECTION

FRONT SECTION

SUCTION LINE

OIL-A/C REFRIGERANT

REFRIGERANT OIL LEVEL

REFRIGERANT-A/C

REFRIGERANT CHARGE LEVEL

A/C ORIFICE TUBE

All sections

SYSTEM EMPTY Dodge Cab & Chassis R3500 HD

Heating & Air Conditioning - Service Information

SYSTEM EMPTY

Evacuate the refrigerant system to the lowest degree of vacuum possible (approximately -88 kPa (- 26 in. Hg) or greater vacuum). See «STANDARD PROCEDURE»(ref-303776-S07739306442008103100000) . Determine if the system holds a vacuum for 15 minutes. If vacuum is held, a leak is probably not present. If system will not maintain vacuum level, proceed to step 2 .
Prepare and dispense 0.284 kilograms (10 ounces) of R-134a refrigerant into the evacuated refrigerant system. See «STANDARD PROCEDURE»(ref-303776-S07739306442008103100000) , and proceed to step 1 of the System Low procedure.