Acura CSX. Manual — part 471
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21-3
Climate Control
Component Location Index
SERVICE VALVE
(HIGH-PRESSURE SIDE)
A/C COMPRESSOR
RECEIVER/DRYER DESICCANT
A/C CONDENSER
SERVICE VALVE
(LOW-PRESSURE SIDE)
EXPANSION VALVE
EVAPORATOR CORE
(Located in the heater unit)
Replacement, page 21-83
Clutch Check, page 21-85
Clutch Overhaul, page 21-86
Thermal Protector Check, page 21-85
Thermal Protector Replacement, page 21-87
Relief Valve Replacement, page 21-87
Replacement, page 21-89
Replacement, page 21-88
Replacement, page 21-80
Replacement, page 21-78
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21-4
Climate Control
A/C PRESSURE SENSOR
RADIATOR FAN
A/C CONDENSER FAN
A/C CONDENSER FAN RELAY
BLOWER MOTOR RELAY
RADIATOR FAN RELAY
A/C COMPRESSOR CLUTCH RELAY
FAN CONTROL RELAY
UNDER-HOOD FUSE/RELAY BOX
A/C DIODE B
A/C DIODE A
ECM/PCM
OUTSIDE AIR TEMPERATURE SENSOR
Test, page 22-70
Test, page 22-70
Test, page 22-70
Test, page 22-70
Test, page 22-70
Test, page 21-68
Replacement, page 21-68
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21-5
EVAPORATOR CORE
(Located in the heater unit)
EVAPORATOR TEMPERATURE
SENSOR
HEATER UNIT/CORE
RECIRCULATION
CONTROL MOTOR
POWER TRANSISTOR
AIR MIX CONTROL MOTOR
DUST AND POLLEN FILTER
CLIMATE CONTROL UNIT
SUNLIGHT SENSOR
IN-CAR TEMPERATURE SENSOR
MODE CONTROL MOTOR
BLOWER UNIT
EXPANSION VALVE
Replacement, page 21-78
Test, page 21-70
Replacement, page 21-81
Test, page 21-74
Replacement,
page 21-74
Test, page 21-71
Test, page 21-72
Replacement, page 21-72
Replacement,
page 21-75
Removal/Installation, page 21-75
Test, page 21-69
Replacement, page 21-69
Test, page 21-67
Replacement, page 21-67
Test, page 21-73
Replacement, page 21-73
Removal/Installation,
page 21-76
Component Replacement,
page 21-77
Replacement, page 21-80
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21-6
21-6
Climate Control
A/C Service Tips and Precautions
A/C System Inspection
A
• Compressed air mixed with the R-134a forms a
combustible vapor.
• The vapor can burn or explode causing serious
injury.
• Never use compressed air to pressure test
R-134a service equipment or vehicle air
conditioning systems.
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
The air conditioning system uses HFC-134a (R-134a)
refrigerant and polyalkyleneglycol (PAG) refrigerant oil,
which are not compatible with CFC-12 (R-12) refrigerant
or mineral oil. Do not use R-12 refrigerant or mineral oil
in this system, and do not attempt to use R-12 servicing
equipment; damage to the air conditioning system or
your servicing equipment will result.
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove R-134a from the air conditioning system.
If accidental system discharge occurs, ventilate the
work area before resuming service.
R-134a service equipment or vehicle air conditioning
systems should not be pressure tested or leak tested
with compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
• Always disconnect the negative cable from the
battery whenever replacing air conditioning parts.
• Keep moisture and dirt out of the system. When
disconnecting any lines, plug or cap the fittings
immediately; don’t remove the caps or plugs until
just before you reconnect each line.
• Before connecting any hose or line, apply a few drops
of refrigerant oil to the O-ring.
• When tightening or loosening a fitting, use a second
wrench to support the matching fitting.
• When discharging the system, use an R-134a
refrigerant recovery/recycling/charging station; don’t
release refrigerant into the atmosphere.
Before troubleshooting any problem with the air
conditioning system, do the following:
1. With the ignition switch in LOCK (0), inspect the A/C
components, the pressure lines, and the hoses for
stains that may indicate a refrigerant or a
compressor oil leak.
2. Check the A/C condenser (A) for material clogging
the fins or for damage to the fins:
• Carefully clean any material from the A/C
condenser fins with water and detergent. If
deeper cleaning is required, clean the fins with
Honda brite cleaner (P/N 08732-0020B).
• Be sure to dry the A/C condenser completely.
• Refer to the Refrigerant Leak Check (see page
21-93) to confirm leaks if there is visible damage
to the A/C condenser.
Check for stains.
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