Dodge Dakota (R1). Manual — part 790
If the floor outlet air temperature is too low, refer
to Cooling to check the engine coolant temperature
specifications. Both of the heater hoses should be hot
to the touch. The coolant return heater hose should
be slightly cooler than the coolant supply heater
hose. If the return hose is much cooler than the sup-
ply hose, locate and repair the engine coolant flow
obstruction in the cooling system. Refer to Cooling
for the procedures.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant
flow:
• Faulty water pump.
• Faulty thermostat.
• Pinched or kinked heater hoses.
• Improper heater hose routing.
• Plugged heater hoses or supply and return ports
at the cooling system connections.
• A plugged heater core.
If proper coolant flow through the cooling system is
verified, and heater outlet air temperature is still
low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat:
• A faulty blower system.
• A faulty heater-A/C control.
• An obstructed cowl air intake.
• Obstructed heater system outlets.
• A faulty, obstructed or improperly installed
blend-air door or actuator.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be
adjusted with the temperature control knob on the
a/c heater control panel, the following could require
service:
• The a/c heater control.
• A faulty blend door actuator.
• The blend door.
• Improper engine coolant temperature.
• Obstructed cowl air intake.
Heater Diagnosis
CONDITION
POSSIBLE CAUSE
CORRECTION
INSUFFICIENT HEATER
OUTPUT.
1. Incorrect engine
coolant level.
1. Check the engine coolant level. Refer to Group 7 -
Cooling System for the procedures.
2. Air trapped in engine
cooling system.
2. Check the operation of the coolant reserve/recovery
system. Refer to Group 7 - Cooling System for the
procedures.
3. Incorrect engine
coolant temperature.
3. Check the performance and operation of the engine
cooling system including: thermostat, water pump, fan
drive, accessory drive belt, coolant flow (plugged radiator
or heater core, plugged or kinked coolant hoses), air flow
(missing or improperly installed radiator air seals or fan
shroud). Refer to Group 7 - Cooling System for the
procedures.
4. Blend air door
actuator not operating
properly.
4. See Blend Door Actuator in the Removal and
Installation and in the Adjustments sections of this group.
5. Blend-air door not
operating properly.
5. Check for a damaged, obstructed or improperly
installed blend-air door or seals. See Heater-A/C Housing
Door in the Removal and Installation section of this
group.
6. Insufficient air flow
through heater housing.
6. Remove foreign material or obstructions from cowl air
intake.
7. Improper blower motor
operation.
7. See Blower Motor in the Diagnosis and Testing section
of this group.
8. Improper electric
coolant pump operation.
8. See electric coolant pump section of this group.
24 - 6
HEATING & AIR CONDITIONING
AN
HEATING & AIR CONDITIONING (Continued)
STANDARD PROCEDURE - REFRIGERANT
SYSTEM SERVICE EQUIPMENT
WARNING: EYE PROTECTION MUST BE WORN
WHEN SERVICING AN AIR CONDITIONING REFRIG-
ERANT SYSTEM. TURN OFF (ROTATE CLOCKWISE)
ALL VALVES ON THE EQUIPMENT BEING USED,
BEFORE CONNECTING TO OR DISCONNECTING
FROM THE REFRIGERANT SYSTEM. FAILURE TO
OBSERVE THESE WARNINGS MAY RESULT IN PER-
SONAL INJURY.
When servicing the air conditioning system, a
R-134a refrigerant recovery/recycling/charging sta-
tion that meets SAE Standard J2210 must be used.
Contact PSE or an automotive service equipment
supplier for refrigerant recovery/recycling/charging
equipment. Refer to the operating instructions sup-
plied by the equipment manufacturer for the proper
care and use of this equipment.
A manifold gauge set may be needed with some
recovery/recycling/charging equipment (Fig. 1). The
service hoses on the gauge set being used should
have manual (turn wheel), or automatic back-flow
valves at the service port connector ends. This will
prevent refrigerant from being released into the
atmosphere.
MANIFOLD GAUGE SET CONNECTIONS
CAUTION: Do not use an R-12 manifold gauge set
on an R-134a system. The refrigerants are not com-
patible and system damage will result.
LOW PRESSURE GAUGE HOSE
The low pressure hose (Blue with Black stripe)
attaches to the suction service port. This port is
located on the compressor manifold, directly over the
suction port of the compressor.
HIGH PRESSURE GAUGE HOSE
The high pressure hose (Red with Black stripe)
attaches to the discharge service port. This port is
located on the liquid line between the condenser and
the evaporator, near the front of the engine compart-
ment.
RECOVERY/RECYCLING/EVACUATION/CHARGING
HOSE
The center manifold hose (Yellow, or White, with
Black stripe) is used to recover, evacuate, and charge
the refrigerant system. When the low or high pres-
sure valves on the manifold gauge set are opened,
the refrigerant in the system will escape through this
hose.
Fig. 1 Manifold Gauge Set - Typical
1 - HIGH PRESSURE GAUGE
2 - VALVE
3 - VACUUM/REFRIGERANT HOSE (YELLOW W/BLACK STRIPE)
4 - HIGH PRESSURE HOSE (RED W/BLACK STRIPE)
5 - LOW PRESSURE HOSE (BLUE W/BLACK STRIPE)
6 - VALVE
7 - LOW PRESSURE GAUGE
AN
HEATING & AIR CONDITIONING
24 - 7
HEATING & AIR CONDITIONING (Continued)
SPECIFICATIONS
A/C APPLICATION TABLE
Item
Description
Notes
VEHICLE
AN Dakota
SYSTEM
R134a w/ fixed
orifice tube
0.057
9
orifice
tube
COMPRESSOR
Sanden
SD7H15
SP-20 PAG oil
Freeze–up
Control
2-wire
evaporator
temperature
sensor
Loss of
refrigerent
charge
a/c low
pressure switch
opens < 7-13
psi - resets >
15-25 psi
accumulator
mounted
Pressure
transducer
450 psi
(cut-out) 290
psi (cut-in)
Liquid line
mounted
CONTROL
HEAD
manual type
and electric
Mode Door
electric
Blend Door
electric
Recirculation
Door
electric
Item
Description
Notes
Blower Motor
hardwired to
control head
9
credit card
9
resistor block
COOLING FAN
V-6 & V-8
electrical/
mechanical
cooling fan
module, I-4
(2.5) electric
fan
Relay
CLUTCH
Electro-
magnetic
Control
relay
PCM
Draw
2.0 - 3.9 amps
@ 12 V
± 0.5V @ 70° F
Gap
0.016
9
- 0.031
9
DRB III
T
Reads
TPS, RPM, A/C
stransducer
pressure
Actuators
clutch relay (fan
relay 2.5 only),
actuator doors
SPECIFICATIONS
TORQUE SPECIFICATIONS
DESCRIPTION
N·m
Ft. Lbs.
In. Lbs.
Compressor Mounting
Bolts
41
30
363
Intermediate Shaft
Coupler Pinch Bolt
13.5
10
120
H-block Retaining Bolts
18
13
159
Refrigerant Lines at
Compressor
23
17
200 ±30
Condenser Mounting Bolts
10.7
8
95
Low Pressure Cycling
Switch: Hand Tighten Only
n/a
n/a
n/a
24 - 8
HEATING & AIR CONDITIONING
AN
HEATING & AIR CONDITIONING (Continued)
CONTROLS
TABLE OF CONTENTS
page
page
A/C COMPRESSOR HIGH PRESSURE RELIEF
A/C COMPRESSOR CLUTCH
A/C COMPRESSOR CLUTCH COIL . . . . . . . . . 10
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 11
A/C COMPRESSOR CLUTCH BREAK-IN . . . . . 11
A/C COMPRESSOR CLUTCH RELAY
A/C COMPRESSOR CLUTCH RELAY . . . . . . . . 14
A/C HEATER CONTROL
HEATER-A/C CONTROL . . . . . . . . . . . . . . . . . . 16
A/C LOSS OF CHARGE SWITCH
LOSS OF CHARGE SWITCH . . . . . . . . . . . . . . 16
A/C PRESSURE TRANSDUCER
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . 17
A/C PRESSURE TRANSDUCER . . . . . . . . . . . . 17
AMBIENT TEMP SENSOR
AMBIENT TEMPERATURE SENSOR . . . . . . . . 18
BLEND DOOR ACTUATOR
BLOWER MOTOR RESISTOR BLOCK
BLOWER MOTOR RESISTOR BLOCK . . . . . . . 21
BLOWER MOTOR SWITCH
BLOWER MOTOR SWITCH . . . . . . . . . . . . . . . 21
MODE DOOR ACTUATOR
RECIRCULATION DOOR ACTUATOR
A/C COMPRESSOR HIGH
PRESSURE RELIEF VALVE
DESCRIPTION
A high pressure relief valve is located on the com-
pressor cylinder head, which is at the rear of the
compressor. This mechanical valve is designed to
vent refrigerant from the system to protect against
damage to the compressor and other system compo-
nents, caused by condenser air flow restriction or an
overcharge of refrigerant.
AN
CONTROLS
24 - 9
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