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Home >> Nissan-Datsun >> 1990 >> D21 Hardbody 2WD V6-2960cc 3.0L SOHC MFI (VG30E) >> Repair and Diagnosis >> Heating and Air Conditioning >> Technical Service Bulletins >> All Technical Service Bulletins >> A/C - Retrofit Service Procedures >> Trouble Diagnosis >> Performance Test Diagnoses >> Performance Data

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 (R-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.