A/C System Description

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

EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator)RECEIVER/DRYER
(Traps debris, and
removes moisture)A/C COMPRESSOR
(Suction and compression)CONDENSER
(Radiation of heat)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.BLOWER FANEVAPORATOR
(Absorption of heat)EVAPORATOR TEMPERATURE SENSORRELIEF VALVE
(Relieves pressure at the compressor
when the pressure is too high)HIGH PRESSURE VAPORHIGH PRESSURE LIQUIDLOW PRESSURE LIQUIDLOW PRESSURE VAPORTHERMAL PROTECTOR (SANDEN)
(Opens the compressor clutch circuit
when the compressor temperature
becomes too high)

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.
R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging station for refrigerant R-134a to service R-134a air conditioning system.
Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any A/C fitting.