Step
| Action
| Yes
| No
|
DEFINITION: The low side pressure is higher than normal and the high side pressure is lower than normal.
• | Malfunctioning Air Conditioning (A/C) Compressor |
• | Refrigerant Under Charge |
|
1
| Were you sent here from the air conditioning (A/C) System Performance Test?
| Go to Step 2
| Go to Air Conditioning (A/C) System Performance Test
|
2
| After continued operation of the A/C system, do the low and the high side pressures equalise or become static?
| Go to Step 5
| Go to Step 3
|
3
|
- Refer to the pressures recorded during the A/C System Performance Test.
- Inspect for the following conditions:
• | The low side refrigerant line at the compressor feels cool to warm. |
• | The high side refrigerant line at the compressor feels warm to hot. |
Do the listed conditions exist?
| Go to Step 5
| Go to Step 4
|
4
|
- Refer to the pressures recorded during the A/C System Performance Test.
- Inspect for the following conditions:
• | The low side refrigerant line at the compressor feels warm. |
• | The high side refrigerant line at the compressor feels warm to hot. |
Do the listed conditions exist?
| Go to Step 5
| Go to Air Conditioning (A/C) System Performance Test
|
5
| The A/C system has a low refrigerant charge.
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?
| Go to Step 6
| -
|
6
|
- After you perform the repairs, record the following:
• | The low and the high side pressures |
• | The instrument panel outlet air temperature |
- Compare the pressures and the temperature to those listed in the A/C Performance Chart. Refer to Air Conditioning (A/C) System Performance Test .
Are the readings within the specified ranges found on the A/C Performance Chart?
| Go to Step 13
| Go to Step 7
|
7
| The A/C compressor is malfunctioning.
Remove the thermal expansion valve (TXV) and inspect for contamination. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
Did you find metal flakes on the TXV?
| Go to Step 9
| Go to Step 8
|
8
| Inspect the TXV for a brown, powdery residue indicating desiccant in the A/C system.
Is a brown, powdery residue present?
| Go to Step 11
| Go to Step 12
|
9
|
- Remove the compressor hose from the compressor. Refer to
Air Conditioning Compressor Hose Replacement : Diesel → L4 → V6 .
- Inspect for metal flake contamination at the line connections and the compressor ports.
Is metal flake contamination present?
| Go to Step 10
| Go to Step 12
|
10
|
- Replace the A/C compressor. Refer to
Air Conditioning Compressor Replacement : Diesel → V6 → 2.4L .
- Replace the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
- Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?
| Go to Step 13
| -
|
11
|
- Replace the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
- Replace the A/C compressor. Refer to
Air Conditioning Compressor Replacement : Diesel → V6 → 2.4L .
- Replace the refrigerant desiccant.
- Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?
| Go to Step 13
| -
|
12
|
- Replace the A/C compressor. Refer to
Air Conditioning Compressor Replacement : Diesel → V6 → 2.4L .
- Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Is the action complete?
| Go to Step 13
| -
|
13
| Operate the system in order to verify the repair
Did you find and correct the condition?
| System OK
| Go to Symptoms - HVAC Systems - Automatic .
|