Cooling Insufficient - A/C System

Cooling Insufficient - Air Conditioning (A/C) System

Due to its variable displacement feature, special caution is necessary when diagnosing insufficient cooling conditions with the V�5 compressor. It is normal for liquid refrigerant to collect in the compressor crankcase during extended periods of shutdown, therefore, cooling action may be delayed up to 2 minutes until the refrigerant is pumped from the compressor crankcase.

Perform the following procedure if there is a delay in cooling upon start-up beyond 2 minutes, and the normal service manual operating procedure for the A/C compressor clutch and the electrical engine cooling fan operation has been accomplished:

1. Select the NORM A/C position.
2. Select the high blower position.
3. Ensure that the A/C compressor clutch is engaged.
4. Ensure that the electrical engine is operating.
5. Ensure that the A/C is operating.
6. Idle the engine for 2 minutes.
7. Perform the following procedure if there is no cooling:
7.1 Operate the engine at approximately 3,000 rotations per minute (rpm) for 1 minute.
7.2 Ensure that the engine is idling.
7.3 Select the mode control to the VENT position for 1 minute.
8. Set the A/C system back to NORM A/C mode.
9. Ensure that the A/C system is operating.
10. Run the engine at approximately 3,000 rpm for 1 minute.
11. Perform the following procedure if there is no cooling:
11.1 Ensure that the A/C system is operating.
11.2 Drive the vehicle in a normal manner for 5 minutes.
11.3 Inspect the A/C system for normal operation. If there is no cooling, refer to VDOT Air Conditioning (A/C) System Diagnosis Initial Inspection and Diagnostic Overview.

R-134a Temperature-Pressure Chart