A/C System Description

The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the system as shown below.


This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the following service items:

  • Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
  • Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (KEIHIN SP-10) designed for the R-134a compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in compressor failure.
  • All A/C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer, expansion valve, O-rings for joints) have to be proper for refrigerant R-134a. Do not confuse with R-12 parts.
  • Use a halogen gas leak detector designed for refrigerant R-134a.
  • Use a vacuum pump adapter which is equipped with a check valve to prevent the backflow of the vacuum pump oil.
  • Separate the manifold gauge sets (pressure gauges, hoses, joints) for refrigerants R-12 and R-134a. Do not confuse them.