A/C Performance Test

A/C Temperatures:

Review Safety Precautions and Warnings before proceeding with this procedure. Air temperature in test room and on vehicle must be 21 °C (70 °F) minimum for this test.

NOTE: When connecting the service equipment coupling to the line fitting, verify that the valve of the coupling is fully closed. This will reduce the amount of effort required to make the connection.

1. Connect a tachometer and manifold gauge set.
2. Set control to A/C, RECIRC, and PANEL, temperature lever on full cool and blower on high.
3. Start engine and hold at 1000 rpm with A/C clutch engaged.
4. Engine should be warmed up with doors and windows closed.
5. Insert a thermometer in the left center A/C outlet and operate the engine for five minutes. The A/C clutch may cycle depending on ambient conditions.
6. With the A/C clutch engaged, compare the discharge air temperature to the A/C Performance Temperatures table
7. If the discharge air temperature fails to meet the specifications in the performance temperature chart. Refer to the Refrigerant Service Procedures for further diagnosis.