Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Dodge Durango 1998-2000 Approved Dodge Durango 2000 00dn_24
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DN HEATING AND AIR CONDITIONING 24 - 1
HEATING AND AIR CONDITIONING
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION DUAL FUNCTION HIGH PRESSURE
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . 2 SWITCH/HIGH PRESSURE CUT-OFF
BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . . . 2 SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . . . 3 LOW PRESSURE CUT-OFF SWITCH. . . . . . . . . . 22
BLOWER MOTOR SWITCH. . . . . . . . . . . . . . . . . . 4 REFRIGERANT SYSTEM LEAKS . . . . . . . . . . . . . 23
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 REFRIGERANT SYSTEM SERVICE
COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . . . 4 EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . . . 5 VACUUM SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 24
CONDENSER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SERVICE PROCEDURES
ELECTRONIC CYCLING CLUTCH SWITCH . . . . . . 5 REFRIGERANT OIL LEVEL . . . . . . . . . . . . . . . . . 28
EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . . 6 REFRIGERANT RECOVERY . . . . . . . . . . . . . . . . . 28
EXPANSION VALVE. . . . . . . . . . . . . . . . . . . . . . . . 6 REFRIGERANT SYSTEM CHARGE . . . . . . . . . . . 28
FILTER-DRIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 REFRIGERANT SYSTEM EVACUATE. . . . . . . . . . 28
HEATER AND AIR CONDITIONER. . . . . . . . . . . . . 7 REMOVAL AND INSTALLATION
HEATER AND AIR CONDITIONER CONTROL . . . . 8 SERVICE WARNINGS AND PRECAUTIONS . . . . 29
HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 B-PILLAR REFRIGERANT LINE . . . . . . . . . . . . . 31
HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . . . 8 BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . . 32
HIGH PRESSURE RELIEF VALVE . . . . . . . . . . . . . 8 BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . . 34
LOW PRESSURE CUT-OFF SWITCH. . . . . . . . . . . 9 BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . . 35
REAR OVERHEAD AIR CONDITIONER . . . . . . . . . 9 COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . 37
REFRIGERANT . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 COMPRESSOR CLUTCH . . . . . . . . . . . . . . . . . . . 38
REFRIGERANT LINES . . . . . . . . . . . . . . . . . . . . . . 9 COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . . 41
REFRIGERANT LINE COUPLERS . . . . . . . . . . . . 10 CONDENSER. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
REFRIGERANT OIL . . . . . . . . . . . . . . . . . . . . . . . 10 DUCTS AND OUTLETS . . . . . . . . . . . . . . . . . . . . 43
REFRIGERANT SYSTEM SERVICE PORTS. . . . . 11 ELECTRONIC CYCLING CLUTCH SWITCH . . . . . 48
VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . . 11 EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . 48
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . 11 EXPANSION VALVE. . . . . . . . . . . . . . . . . . . . . . . 51
DIAGNOSIS AND TESTING FILTER-DRIER. . . . . . . . . . . . . . . . . . . . . . . . . . . 52
A/C PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . 11 HEATER-A/C CONTROL . . . . . . . . . . . . . . . . . . . 53
BLOWER MOTOR . . . . . . . . . . . . . . . . . . . . . . . . 15 HEATER-A/C HOUSING. . . . . . . . . . . . . . . . . . . . 54
BLOWER MOTOR RELAY . . . . . . . . . . . . . . . . . . 15 HEATER-A/C HOUSING DOOR . . . . . . . . . . . . . . 57
BLOWER MOTOR RESISTOR . . . . . . . . . . . . . . . 16 HEATER CORE . . . . . . . . . . . . . . . . . . . . . . . . . . 59
BLOWER MOTOR SWITCH. . . . . . . . . . . . . . . . . 17 HIGH PRESSURE CUT-OFF SWITCH . . . . . . . . . 59
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . 17 LIQUID LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
COMPRESSOR CLUTCH COIL . . . . . . . . . . . . . . 18 LOW PRESSURE CUT-OFF SWITCH. . . . . . . . . . 62
COMPRESSOR CLUTCH RELAY . . . . . . . . . . . . . 18 MODE DOOR VACUUM ACTUATOR . . . . . . . . . . 62
ELECTRONIC CYCLING CLUTCH SWITCH REAR BLOWER MOTOR SWITCH . . . . . . . . . . . 63
(Front Unit Only) . . . . . . . . . . . . . . . . . . . . . . . 19 REAR OVERHEAD A/C UNIT. . . . . . . . . . . . . . . . 64
EXPANSION VALVE. . . . . . . . . . . . . . . . . . . . . . . 19 REFRIGERANT LINE COUPLER . . . . . . . . . . . . . 66
HEATER-A/C CONTROL . . . . . . . . . . . . . . . . . . . 20 SUCTION AND DISCHARGE LINE . . . . . . . . . . . 66
HEATER PERFORMANCE . . . . . . . . . . . . . . . . . . 21 SUCTION LINE JUMPER . . . . . . . . . . . . . . . . . . 67
TEMPERATURE CONTROL CABLE . . . . . . . . . . . 68
24 - 2 HEATING AND AIR CONDITIONING DN
UNDERBODY REFRIGERANT LINE. . . . . . . . . . . 69 SPECIFICATIONS
VACUUM CHECK VALVE . . . . . . . . . . . . . . . . . . . 70 A/C APPLICATION TABLE . . . . . . . . . . . . . . . . . . 73
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . 70
ADJUSTMENTS
TEMPERATURE CONTROL CABLE . . . . . . . . . . . 72
DESCRIPTION AND OPERATION rear blower motor switch and the rear blower motor
resistor.
BLOWER MOTOR
OPERATION
FRONT The rear blower motor will only operate when the
ignition switch is in the On position. The rear blower
DESCRIPTION motor receives a fused battery feed through a fuse in
The blower motor and blower wheel are located in the relay and fuse block whenever the ignition switch
the passenger side end of the heater-A/C housing, is in the On position. The relay and fuse block is
below the glove box. The blower motor controls the attached to the back of the junction block, under the
velocity of air flowing through the heater-A/C hous- left side of the instrument panel in the passenger
ing by spinning a squirrel cage-type blower wheel compartment.
within the housing at the selected speed. The blower The rear blower motor, blower wheel, and blower
motor and blower wheel can only be serviced with wheel housing cannot be repaired and, if faulty or
the heater-A/C housing removed from the passenger damaged, they must be replaced as a complete facto-
compartment. ry-balanced unit.
OPERATION BLOWER MOTOR RELAY
The blower motor will only operate when the igni-
tion switch is in the On position, and the heater-A/C DESCRIPTION
mode control switch knob is in any position, except The blower motor relay (also referred to as Voltage
Off. The blower motor receives a fused battery feed Reduction Relay or VRR) is an International Stan-
through the blower motor relay (Voltage Reduction dards Organization (ISO)-type relay. The relay is an
Relay or VRR) whenever the ignition switch is in the electromechanical device that switches battery cur-
On position. rent from a fuse in the Power Distribution Center
The blower motor battery feed circuit is protected (PDC) directly to the blower motor. The relay is ener-
by a fuse in the Power Distribution Center (PDC). gized when the relay coil is provided a voltage signal
The blower motor relay control circuit is protected by by the ignition switch. This arrangement reduces the
a fuse in the junction block. Blower motor speed is amount of battery current that must flow through
controlled by regulating the ground path through the the ignition switch.
heater-A/C mode control switch, the blower motor
switch, the blower motor resistor, the blower motor OPERATION
relay (VRR), and the high speed blower motor relay. The blower motor relay control circuit is protected
The blower motor and blower motor wheel cannot by a fuse located in the junction block. When the
be repaired and, if faulty or damaged, they must be relay is de-energized, the blower motor receives no
replaced. The blower motor and blower wheel are battery current. The VRR is used to reduce blower
each serviced separately. speeds in Heat mode. In non-A/C modes, the relay is
de-energized and switches the current flow through
REAR an added resistance in the resistor block. When an
A/C mode is selected, the relay is energized and the
DESCRIPTION normally open contact is used to bypass the added
The rear blower motor and blower wheel are resistor. The fuse is located in the small relay fuse
mounted to a blower wheel housing located inside the block that is attached to the Junction Block. The
rear overhead A/C unit, above the headliner. The relay is energized by grounding the coil low side with
blower motor controls the velocity of air flowing the HVAC switch in any A/C mode. See Blower Motor
through the overhead A/C unit by spinning a wide Relay in the Diagnosis and Testing section of this
squirrel cage-type blower wheel within the housing group for more information.
at the selected speed. Rear blower motor speed is The blower motor relay is mounted with a single
controlled by regulating the ground path through the screw directly to the instrument panel's structural
DN HEATING AND AIR CONDITIONING 24 - 3
DESCRIPTION AND OPERATION (Continued)
plastic inside the glove box opening, next to the left-
side energy-absorbing bracket (Fig. 1). Refer to the
PDC label for blower motor relay identification and
location.
The blower motor relay (VRR) cannot be repaired
and, if faulty or damaged, it must be replaced.
Fig. 2 Blower Motor Resistor - Factory Installation
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