Acura RL (1996-2004 year). Manual — part 589
Description
Outline
The air conditioner system removes heat from the passenger compartment by circulating refrigerant through the system
as shown below.
High-temperature/
high-pressure gas
High-temperature/
high-pressure liquid
Suction and compression
Radiation of heat
Traps debris,
and removes
moisture
High-temperature/
high-pressure liquid
COMPRESSOR
EVAPORATOR
PRESSURE
REGULATOR (EPR)
VALVE
Less moisturized
low-pressure vapor
RECEIVER/DRYER
More liquidified
low-pressure vapor
EXPANSION VALVE
EVAPORATOR/BLOWER UNIT
LIQUID LINE
(High-side)
SUB CONDENSER
(Part of condenser assembly)
SUCTION LINE (Low-side)
COMPRESSOR
RECEIVER/DRYER
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 (ND-OIL 8) 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
that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning systems.
Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any
A/C fitting.
DISCHARGE LINE (High-side)
CONDENSER LINE
This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the follow-
ing service items:
CONDENSER
EVAPORATOR
PRESSURE
REGULATOR
CONDENSER
Absorption of heat
EVAPORATOR
SUB
CONDENSER
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Description
Fan Control Unit
The fan control unit makes calculations based on signals from the radiator fan control sensor. It then controls the opera-
tion of the radiator fan, condenser fan and A/C system.
ON
OFF
172°F (78°C)
183°F (84°C)
When engine coolant temperature is above 183°F (84°C),
the fan control unit turns Tr1 ON, and the radiator fan
(Low) and condenser fan runs (Low).
ON
OFF
183°F (84°C)
When engine coolant temperature is above 194°F (90°C),
the fan control unit turns Tr2 ON, and the radiator fan
(High) runs, and the condenser fan (High) goes on.
194°F (90°C)
ON
OFF
225°F (107°C)
When engine coolant temperature is above 228°F (109°C),
the fan control unit turns Tr3 OFF, and stops the A/C com-
pressor.
228°F (109°C)
*1: CONDENSER FAN RELAY
*2: RADIATOR FAN RELAY
*3: RADIATOR FAN MAIN RELAY
RED/WHT
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A/C Pressure Switch
The A/C pressure switch consists of a High-Low pressure switch (A/C pressure switch A) and a Middle pressure switch
(A/C pressure switch B).
High-Low pressure switch
If the refrigerant pressure becomes too high (due to blockage), or too low (due to leakage), the A/C pressure switch
sends a signal to the fan control unit to prevent the compressor from operating.
ON
OFF
• Middle pressure switch
If the refrigerant pressure goes above or below 1,520 kPa (15.5 kgf/cm
2
, 220 psi), the A/C pressure switch sends a signal
to the fan control unit to change the speed of the condenser fan and radiator fan (High-Low).
290 kPa (3.0 kgf/cm
2
, 42 psi)
ON
OFF
1,230 kPa
(12.5 kgf/cm
2
,178 psi)
1,520 kPa
(15.5 kgf/cm
2
,220 psi)
MIDDLE
PRESSURE
SWITCH
HIGH-LOW
PRESSURE
SWITCH
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Description
The evaporator pressure regulator (EPR) is a pressure control valve. The EPR is located behind the low-pressure side of the
evaporator, and keeps the pressure in the evaporator constant. When the evaporator pressure drops below about 196 kPa
(2.0 kgf/cm
2
) [28.4 psi] the piston closes to keep the pressure in the evaporator above 196 kPa (2.0 kgf/cm
2
) [28.4 psi].
Consequently, the EPR keeps the evaporator temperature and the delivery temperature constant.
Open
PISTON
Close
177 202 kPa
(1.80 2.06 kgf/cm
2
)
[25.6 29.3 psi]
PRESSURE
BELLOWS
PISTON
Compressor side
Evaporator side
SPRING
Evaporator Pressure Regulator (EPR)
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