Dodge dakota 2002 Service Manual page 2779

24 - 4 HEATING & AIR CONDITIONING
HEATING & AIR CONDITIONING (Continued)
Condition
Normal pressures, but A/C
Performance Test air
temperatures at center panel
outlet are too high.
The low side pressure is
normal or slightly low, and
the high side pressure is too
low.
The low side pressure is
normal or slightly high, and
the high side pressure is too
high.
Pressure Diagnosis
Possible Causes
4. Faulty a/c compressor
clutch relay.
5. Improperly installed or
faulty Fin Sensor.
6. Faulty a/c high pressure
transducer.
7. Faulty Powertrain Control
Module (PCM).
1. Excessive refrigerant oil in
system.
2. Blend door inoperative or
sealing improperly.
3. Blend door actuator faulty
or inoperative.
1. Low refrigerant system
charge.
2. Refrigerant flow through
the accumulator is restricted.
3. Refrigerant flow through
the evaporator coil is
restricted.
4. Faulty compressor.
1. Condenser air flow
restricted.
2. Inoperative cooling fan.
3. Refrigerant system
overcharged.
Correction
4. See A/C Compressor Clutch Relay/Diagnosis
and Testing - Compressor Clutch Relay in this
group. Test the compressor clutch relay and relay
circuits. Repair the circuits or replace the relay, if
required.
5. See Fin Sensor/Diagnosis and Testing in this
group. Reinstall or replace the Fin Sensor as
required.
6. See A/C High Pressure Transducer/Diagnosis
and Testing in this group. Test the a/c high
pressure transducer and replace, if required.
7. (Refer to Appropriate Diagnostic Information).
Test the PCM and replace, if required.
1. See Refrigerant Oil/Standard Procedure -
Refrigerant Oil Level in this group. Recover the
refrigerant from the refrigerant system and
inspect the refrigerant oil content. Restore the
refrigerant oil to the proper level, if required.
2. See Blend Door in this group. Inspect the
blend door for proper operation and sealing and
correct, if required.
3. Perform blend door actuator diagnosis, replace
if faulty.
1. See Plumbing/Diagnosis and Testing -
Refrigerant System Leaks in this group. Test the
refrigerant system for leaks. Repair, evacuate and
charge the refrigerant system, if required.
2. See Accumulator in this group. Replace the
restricted accumulator, if required.
3. See A/C Evaporator in this group. Replace the
restricted evaporator coil, if required.
4. See A/C Compressor in this group. Replace
the compressor, if required.
1. Check the condenser for damaged fins, foreign
objects obstructing air flow through the condenser
fins, and missing or improperly installed air seals.
Refer to Cooling for more information on air
seals. Clean, repair, or replace components as
required.
2. Refer to Cooling for more information. Test the
cooling fan and replace, if required.
3. See Plumbing/Standard Procedure -
Refrigerant System Charge in this group. Recover
the refrigerant from the refrigerant system.
Charge the refrigerant system to the proper level,
if required.
DR