Condition
Possible Causes
Correction
Normal pressures, but A/C
Performance Test air
temperatures at center panel
outlet are too high.
1. Excessive refrigerant oil in
system.
1. See 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. Blend door actuator
improperly installed or faulty.
2. See Blend Door Actuator in this group. Inspect
the actuator for proper operation and replace, if
required.
3. Blend door inoperative or
sealing improperly.
3. See HVAC Housing in this group. Inspect the
blend door for proper operation and sealing.
Repair if required.
4. Blend door not in full cold
position.
Use a DRBIII Scan Tool to check for DTCs and
blend door position. Refer to Body Diagnostic
Procedures.
The low side pressure is
normal or slightly low, and the
high side pressure is too low.
1. Low refrigerant system
charge.
1. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
2. Refrigerant flow through
the A/C evaporator is
restricted.
2. See A/C Evaporator in this group. Replace the
restricted A/C evaporator, if required.
3. Faulty A/C compressor.
3. See A/C Compressor in this group. Replace
the compressor, if required.
The low side pressure is
normal or slightly high, and
the high side pressure is too
high.
1. A/C condenser air flow
restricted.
1. Check the A/C condenser for damaged fins,
foreign objects obstructing air flow through the
condenser fins, and missing or improperly
installed air seals. Clean, repair, or replace
components as required.
2. Refrigerant flow through
the receiver/drier is
restricted.
2. See Receiver/Drier in this group. Replace the
restricted receiver/drier, if required.
3. Inoperative radiator
cooling fan.
3. Test the radiator cooling fan and replace, if
required. Refer to Group 7.
4. Refrigerant system
overcharged.
4. See Refrigerant System Charge in this group.
Recover the refrigerant from the refrigerant
system. Charge the refrigerant system to the
proper level, if required.
5. Air in the refrigerant
system.
5. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
6. Engine overheating.
6. Test the engine cooling system and repair, if
required. Refer to Group 7.
The low side pressure is too
high, and the high side
pressure is too low.
1. Accessory drive belt
slipping.
1. Inspect the accessory drive belt condition and
tension. Tighten or replace the accessory drive
belt, if required. Refer to Group 7.
2. Faulty A/C expansion
valve.
2. See A/C Expansion Valve in this group.
Replace the valve, if required.
3. Faulty A/C compressor.
3. See A/C Compressor in this group. Replace
the compressor, if required.
RS
HEATING & AIR CONDITIONING
24 - 9
HEATING & AIR CONDITIONING (Continued)