Pressure Gauge Tests

PERFORMANCE DATA

General performance characteristics for the CFC-12 (R-12) A/C system and the retrofit A/C system differ. These differences are outlined below.

RECIRCULATING-TO-DISCHARGE AIR TEMPERATURE

^ The retrofitted A/C system retains the original CFC-12 (R-12) heat exchanger (evaporator and condenser).

^ Some CFC-12 (R-12) lubrication oil remains in the A/C system.

^ Because of these two stated reasons, the retrofit A/C system has a slightly lower cooling capacity than the CFC-12

(R-12) A/C system. (Maximum discharge air temperature is increased by approximately 2°C (3.6°F).]

AMBIENT AIR TEMPERATURE-TO-OPERATING PRESSURE

The retrofit A/C system has a higher operating pressure than the CFC-12 (R-12) A/C system when the outside air temperature exceeds 15°C (59°F).

^ High-pressure side (Discharge side): Maximum pressure increase of approximately 294 kPa (3 kg/sq.cm, 43 psi)

^ Low-pressure side (Suction side): Same as CFC-12 (fl-12) A/C system

Refer to Service Manuals for discharge air temperature and operating pressure values for Individual vehicle models. Refer to these Manuals for CFC-12 (R-12) A/C system values.

DIAGNOSIS FOR ABNORMAL PRESSURE

Whenever the high and/or low side pressure is abnormal, diagnose using a manifold gauge. The marker above the gauge scale in the following tables indicates the standard (normal) pressure range. Since the standard (normal) pressure, however, differs from vehicle to vehicle, refer to ("Ambient air temperature-to-operating pressure").














Diagnosis Tables For Abnormal Pressures