Nissan Skyline R34 workshop service manual page 156

text version of content this owner's manual page from owners manual to the vehicle Nissan Skyline, year of production 1998 - 2002:

FULLY AUTOMATIC AIR CONDITIONER Trouble Diagnosis by Gauge Pressure Connect the manifold gauge to the cooler cycle (service valve). Speculate and correct the root cause and trouble location based on the cooler cycle pressure. Symptom Cycle status Probable cause Corrective action lnsufficient cooling by con- denser Radiator fan malfunction Repair or replace faulty parts. Pressure retums to normal lmproper air guard attach- Clean or repair the condenser Both high- and low-pressures when water is splashed on the ment fins. are high. condenser. Clogged or dirty condenser fins Recover all refrigerant. Re- Refrigerant over-charge vacuum and charge to appro- priate amount. When the compressor is stopped, the pressure drops Recover all refrigerant. Re- High-pressure is too high. suddenly approx. 2 kg/cm2. Air is mixed in the cooler cycle. vacuum and charge to appro- Then, the pressure drops priate amount. gradually. High-pressure is high, and low- Temperature differences occurs Crushed or clogged high-pres- pressure is too low. where the high-pressure pipe is sure pipe between the com- Repair or replace faulty part. crushed or clogged. pressor and condenser Clogged expansion valve Gas leak at temperature sen- Remove foreign matter in Evaporator outlet is not cooled. sor expansion valve, or replace. Clogging due to foreign mat- ter There is a temperature differ- Both high- and low-pressures ence at the liquid tank outlet Liquid tank malfunction Replace liquid tank. are low. (Sometimes the low pipe, or liquid tank is covered (clogged strainer) pressure is negative.) with frost. Evaporator outlet pipe is cov- lmproper attachment or failure Replace intake air temperature ered with frost (no airflow). of intake air temperature sen- sensor, or repair thermistor sor thermistor attachment position. There is some temperature dif- I Inspect for refrigerant leakage. ference between compressor lnsufficient refrigerant Recover all refrigerant. Re- high- and low-pressure pipes. vacuum and charge to appro- priate amount. Extract all refrigerant. Suff i- Sometimes high-pressure is Sometimes, the evaporator out- Moisture is mixed in the cooler ciently vacuum and remove low, and low-pressure is nega- let is not cooled. Sometimes, cycle. (Clogging due to frozen moisture. Charge to appropri- tive. the evaporative inlet is covered moisture in the expansion ate amount. At this time, with frost. valve) replace the liquid tank without fail. When the compressor is stopped, the pressures equal- Compressor malfunction (com- I High-pressure is low, and low- ize. There is no temperature pression defect) Replace the compressor. pressure is high. difference between the com- Valve damage or failure pressor high-pressure pipe and Faulty gasket low-pressure pipe. HA-I 0

owners manual Nissan Skyline

owners manual Nissan Skyline - year of production: 1998, 1999, 2000, 2001, 2002 - Nissan Skyline R34 workshop service manual EN