2006 ACURA CSX air conditioning

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HVAC (Heating, Ventilation, andAir Conditioning)
Climate Control
HVAC (Heating, Ventilation, and Air Conditioning)
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Special Tools . 21-2
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Component Location Index . 21-3
A/C Service
Tips and Precautions . 21-6
A/C System Inspection . 21-6
A/C Refrigerant Oil Replacement . 21-7
A/C Line Replacement . 21-8
General Troubleshooting Information . 21-9
DTC Troubleshooting Index . 21-15
Symptom Troubleshooting Index . 21-16
System Description . 21-19
Circuit Diagram . 21-26
DTC Troubleshooting . 21-28
Climate Control Power and Ground Circuit
Troubleshooting . 21-53
Navigation Communication Line Circuit
Troubleshooting . 21-54
Radiator and A/C Condenser Fan Low Speed Circuit
Troubleshooting . 21-56
A/C Condenser Fan High Speed Circuit Troubleshooting . 21-60
A/C Compressor Clutch Circuit Troubleshooting . 21-62
A/C Signal Circuit Troubleshooting . 21-64
In-car Temperature Sensor Test . 21-67
In-car Temperature Sensor Replacement . 21-67
Outside Air Temperature Sensor Test . 21-68
Outside Air Temperature Sensor Replacement . 21-68
Sunlight Sensor Test . 21-69
Sunlight Sensor Replacement . 21-69
Evaporator Temperature Sensor Test . 21-70 ............
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Power Transistor Test . 21-71
Air Mix Control Motor Test . 21-72
Air Mix Control Motor
Replacement . 21-72
Mode Control Motor Test . 21-73
Mode Control Motor Replacement . 21-73
Recirculation Control Motor Test . 21-74
Recirculation Control Motor Replacement . 21-74
Climate Control Unit Removal/Installation . 21-75
Dust and Pollen Filter Replacement . 21-75
Blower Unit Removal/Installation . 21-76
Blower Unit Component Replacement . 21-77
Evaporator Core Replacement . 21-78
Expansion Valve Replacement . 21-80
Heater Unit/Core Replacement . 21-81
A/C Compressor Replacement . 21-83
A/C Compressor Clutch Check . 21-85
A/C Compressor Clutch Overhaul . 21-86
A/C Compressor Thermal Protector
Replacement . 21-87
A/C Compressor Relief Valve Replacement . 21-87
A/C Condenser Replacement . 21-88
Receiver/Dryer Desiccant Replacement . 21-89
Refrigerant Recovery . 21-90
System Evacuation . 21-91
System Charging . 21-92
Refrigerant Leak Check . 21-93
A/C System Noise Check . 21-97
A/C System Test . 21-99
08/08/21 14:40:45 61SNR030_210_0002
ProCarManuals.com
DYNOMITE -2009-


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%)Ref. No. Tool Number Description Qty
21-2
HVAC (Heating, Ventilation, and Air Conditioning)
Special Tools
07SAZ-001000A
Backprobe Set 2
08/08/21 14:40:45 61SNR030_210_0003
ProCarManuals.com
DYNOMITE -2009-

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21-621-6 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 c onditioning
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.
08/08/21 14:40:55 61SNR030_210_0007
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DYNOMITE -2009-

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21-721-7
A/C Refrigerant Oil Replacement
A
B C
3. Inspect the drive belt (see page 4-30).
4. Make sure no material is blocking the air flow to the
A/C condenser.
5. Check the dust and pollen filter. Replace it if it is clogged (see page 21-75).
6. Check for kinks or sharp bends in the A/C lines and hoses, which can greatly reduce system
performance. Replace A/C lines and hoses if they
are kinked or damaged (see page 21-8).
7. Start the engine, turn the air conditioning system on, and allow it to run for a few minutes and reach
stable operation.
 Check that the A/C operates at each position of the blower fan switch (except OFF). If the A/C
does not operate, refer to the symptom
troubleshooting.
 Check that the A/C compressor clutch (A) is engaged. The pressure plate should be rotating
at the same speed as the pulley. If the pressure
plate does not engage, refer to the symptom
troubleshooting.
 Check that the A/C condenser fan (B) and radiator fan (C) operate when the A/C compressor clutch
is engaged. If either fan fails to operate when the
A/C compressor clutch is engaged, refer to the
symptom troubleshooting.
 Check that the engine idle speed is correctly maintained when the A/C is switched on and off
and the A/C compressor clutch is engaged and
disengaged. Recommended PAG oil: SP-10
P/N 38897-P13-A01AH: 120 mL (4 fl·oz)
It is important to have the correct amount of refrigerant
oil in the A/C system to ensure proper lubrication of the
compressor. Too little oil damages the compressor; too
much oil reduces the cooling capacity of the system,
and can produce high vent temperatures.
 To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other
refrigerant oils.
 Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture
absorption.
 Do not spill the refrigerant oil on the vehicle; it may damage the paint; if it gets on the paint, wash it off
immediately.
Add the recommended refrigerant oil in the amount
listed if you replace any of the following parts: ........
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A/C condenser .50 mL (1 2/3 fl·oz)
Evaporator .40 mL (1 1/3 fl·oz)
Line or hose .10 mL (1/3 fl·oz)
Receiver/Dryer .10 mL (1/3 fl·oz)
Leakage repair .25 mL (5/6 fl·oz)
A/C compressor .Since the oil separator is
equipped inside the compressor
for this vehicle, oil drainage is
unnecessary at the time of
compressor replacement.
08/08/21 14:40:56 61SNR030_210_0008
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DYNOMITE -2009-

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21-721-7
A/C Refrigerant Oil Replacement
A
B C
3. Inspect the drive belt (see page 4-30).
4. Make sure no material is blocking the air flow to the
A/C condenser.
5. Check the dust and pollen filter. Replace it if it is clogged (see page 21-75).
6. Check for kinks or sharp bends in the A/C lines and hoses, which can greatly reduce system
performance. Replace A/C lines and hoses if they
are kinked or damaged (see page 21-8).
7. Start the engine, turn the air conditioning system on, and allow it to run for a few minutes and reach
stable operation.
 Check that the A/C operates at each position of the blower fan switch (except OFF). If the A/C
does not operate, refer to the symptom
troubleshooting.
 Check that the A/C compressor clutch (A) is engaged. The pressure plate should be rotating
at the same speed as the pulley. If the pressure
plate does not engage, refer to the symptom
troubleshooting.
 Check that the A/C condenser fan (B) and radiator fan (C) operate when the A/C compressor clutch
is engaged. If either fan fails to operate when the
A/C compressor clutch is engaged, refer to the
symptom troubleshooting.
 Check that the engine idle speed is correctly maintained when the A/C is switched on and off
and the A/C compressor clutch is engaged and
disengaged. Recommended PAG oil: SP-10
P/N 38897-P13-A01AH: 120 mL (4 fl·oz)
It is important to have the correct amount of refrigerant
oil in the A/C system to ensure proper lubrication of the
compressor. Too little oil damages the compressor; too
much oil reduces the cooling capacity of the system,
and can produce high vent temperatures.
 To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other
refrigerant oils.
 Immediately after using the oil, reinstall the cap on the container, and seal it to avoid moisture
absorption.
 Do not spill the refrigerant oil on the vehicle; it may damage the paint; if it gets on the paint, wash it off
immediately.
Add the recommended refrigerant oil in the amount
listed if you replace any of the following parts: ........
.............. ............ ........
..............
........
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..............
A/C condenser .50 mL (1 2/3 fl·oz)
Evaporator .40 mL (1 1/3 fl·oz)
Line or hose .10 mL (1/3 fl·oz)
Receiver/Dryer .10 mL (1/3 fl·oz)
Leakage repair .25 mL (5/6 fl·oz)
A/C compressor .Since the oil separator is
equipped inside the compressor
for this vehicle, oil drainage is
unnecessary at the time of
compressor replacement.
08/08/21 14:40:56 61SNR030_210_0008
ProCarManuals.com
DYNOMITE -2009-


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21-19
System Description
EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator) RECEIVER/DRYER
DESICCANT
(Traps debris, and
removes moisture)A/C COMPRESSOR
(Suction and compression)
A/C CONDENSER
(Radiation of heat)
A/C PRESSURE SENSOR
(Triple function)
BLOWER FAN
EVAPORATOR
(Absorption of heat)
EVAPORATOR TEMPERATURE SENSOR
RELIEF VALVE
(Relieves pressure at the A/C compressor
when the pressure is too high)
HIGH PRESSURE VAPORHIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
The air conditioning (A/C) system removes heat from the passenger compartment by transferring heat from the
ambient air to the evaporator. The A/C system refrigerant expands in the evaporator, and the evaporator becomes
very cold and absorbs the heat from the ambient air. The blower fan pushes air across the evaporator where the heat
is absorbed, and then it blows the cool air into the passenger compartment.
This vehicle uses HFC-134a (R-134a) refrigerant, which does not contain chlorofluorocar bons. 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 (SP-10) designed for the R-134a A/C compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C
compressor failure.
 All A/C system parts (A/C compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer, expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange 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 the R-134a air
conditioning systems.
 Always recover refrigerant R-134a with an approved recovery/recycling/charging station before disc onnecting any
A/C fitting.
(cont’d)
When the refrigerant is below
196 kPa (2.0 kgf/cm , 28 psi)
or above 3,138 kPa (32 kgf/cm ,
455 psi), the ECM/PCM turns the
compressor relay off to protect
the A/C compressor.
When the refrigerant is above
1,470 kPa (15.0 kgf/cm , 213 psi),
the A/C pressure sensor
switches the radiator and
A/C condenser fans to high speed.22
2
08/08/21 14:40:59 61SNR030_210_0020
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Oil Separator
21-20Climate Control
System Description (cont’d)
OUTLET SIDE
(To A/C condenser)
OIL SEPARATOR
FROM INSIDE
A/C COMPRESSOR
INLET SIDE
(To inside
A/C compressor)
EVAPORATOR
A/C COMPRESSOR A/C CONDENSER
EXPANSION VALVE
HIGH REFRIGERANT OIL FLOWLOW REFRIGERANT OIL FLOW
OIL SEPARATOR
Oil emission from the A/C compressor to the A/C line is reduced by placing the oil separator in the A/C compressor.
This results in a thinner oil film inside of the heat exchangers (A/C condenser and evaporator). Air conditioning
efficiency is increased without sacrificing engine performance.
08/08/21 14:41:00 61SNR030_210_0021
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DYNOMITE -2009-


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21-8321-83
A/C Compressor Replacement
A C
B
6x1.0mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
A
B
13. Remove the self-tapping screws, the heater core cover (A), the grommet (B). and carefully pull out
the heater core (C).
14. Install the heater core and the evaporator core in the reverse order of removal.
15. Install the heater unit in the reverse order of removal, and note these items:
 Do not interchange the inlet and outlet heater hoses, and install the hose clamps securely.
 Refill the cooling system with engine coolant (see page 10-8).
 Make sure that there is no coolant leakage.
 Make sure that there is no air leakage.
 Refer to evaporator core replacement (see page 21-78).
16. Do the battery terminal reconnection procedure (see page 22-68). NOTE: Do not install an A/C compressor into a system
unless you are completely sure that the system is free
of contamination. Installing the A/C compressor into a
contaminated system can result in premature A/C
compressor failure.
1. If the A/C compressor is marginally operable, run the engine at idle speed, and let the air
conditioning work for a few minutes, then shut the
engine off.
2. Recover the refrigerant with a recovery/recycling/ charging station (see page 21-90).
3. Remove the drive belt (see page 4-31).
4. Remove the front bulkhead and the condenser fan shroud (see page 10-19).
5. Remove the splash shield (see page 20-172).
6. Remove the bolt and the nut, then disconnect the suction hose (A) and discharge hose (B) from the
A/C compressor. Plug or cap the lines immediately
after disconnecting them to avoid moisture and
dust contamination.
(cont’d)
08/08/21 14:43:45 61SNR030_210_0084
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