Refrigerant System Tests
Refrigerant System TestsThe following test conditions must be established to obtain accurate pressure readings:
^ Run engine at 1500 rpm for 10 minutes.
^ Operate air conditioning system on MAX air conditioning (recirculating air).
^ Run blower motor at HI speed.
^ Stabilize vehicle interior temperature at 21 °C to 27°C (70°F to 80°F).
Service Access Gauge Port Valves
When attaching Rotunda R- 134a Manifold Gauge Set 176-R032A or equivalent with quick disconnects Rotunda 176-R0026 and 176-R0027 or equivalents to the system, the low pressure gauge hose must be connected to the service access gauge port valve on top of the suction accumulator/drier. The high pressure service access gauge port valve is located in the discharge line near the A/C condenser core.
Diagnosis of the refrigerant system must be done by analyzing the high pressure readings in the charts shown to determine if the system pressures are normal. The conditional requirements for the refrigerant systems tests must be satisfied to obtain accurate pressure readings.
Normal Cycling, Refrigerant System Center Register Temperature Range
THESE CONDITIONAL REQUIREMENTS FOR THE.CYCLING SYSTEM TESTS MUST BE SATISFIED TO OBTAIN ACCURATE PRESSURE READINGS.
^ STABILIZED PRESSURES
^ STABILIZED IN VEHICLE TEMPERATURES @ 70° TO 80°F (21° TO 27°C)
^ MAXIMUM AIR CONDITIONING (RECIRCULATING AIR)
^ MAXIMUM SPEED OF HEATER BLOWER MOTOR 1500 ENGINE RPM
