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

A/C PRESSURE SWITCH When the refrigerant is below 196 kPa (2.0 kgf/cm2, 28 psi) or above 3,140 kPa (32 kgf/cm2, 455 psi), the A/C pressure switch opens the circuit to the A/C switch and stops the air conditioning to protect the compressor. EXPANSION VALVE (Meters the required amount of refrigerant into the evaporator) BLOWER FAN EVAPORATOR (Absorption of heat) EVAPORATOR TEMPERATURE SENSOR THERMAL PROTECTOR (Opens the compressor clutch circuit when the compressor temperature becomes too high) RELIEF VALVE (Relieves pressure at the compressor when the pressure is too high) COMPRESSOR (Suction and compression) HIGH PRESSURE VAPOUR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOUR CONDENSER (Radiation of heat) RECEIVER/DRYER (Traps debris and removes moisture)

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 (SANDEN 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.