System Performance Test

Tools Required:
J 39500 ACR4 System or
J 39183-C R-134a Manifold Gauge Set
J 6742-03 Precision Thermometer (or Equivalent)

Before performing the air conditioning performance test, a functional test should be made to assure that the air distribution system valves are functioning properly to route all the air passing through the evaporator to the outlets. Refer to Functional Test. Functional Test/Check

Performance testing provides a measure of air conditioning system operating efficiency by measuring and comparing pressures at the high-pressure and low-pressure sides of the refrigeration system, the temperature of the air being discharged into the passenger compartment, and the evaporator temperature.

Start with the air conditioning performance test, and compare vehicle air conditioning system performance with the chart.

If system performance is not within specifications, proceed to the Air Conditioning Diagnostic Charts. Testing and Inspection