2006 ACURA CSX air filter

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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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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 MOTORBLOWER 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 21-73Removal/Installation,
page 21-76
Component Replacement, page 21-77
Replacement, page 21-80
08/08/21 14:40:55 61SNR030_210_0006
ProCarManuals.com
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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21-721-7
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: ........
.............. ............ ........
..............
........
.............. ............ ........
..............
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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21-7521-75
Climate Control Unit Removal/
Installation Dust and Pollen Filter Replacement
B
A A
A
B
1. Remove the center panel:  ’06-08 models with navigation (see page 23-155)
 ’06-08 models without navigation (see page23-80)
 ’09 model with navigation (see page 23-355)
 ’09 model without navigation (see page 23- 256)
2. Remove the dials (A), the self-tapping screws, and the climate control unit (B).
3. Install the control unit in the reverse order of removal. After installation, operate the various
functions to see whether works properly.
4. Run the self-diagnostic function to confirm that there are no problems in the system (see page
21-11). 1. Open the glove box. Remove the glove box stop on
each side, then let the glove box hang down
(see page 20-104).
2. Remove the dust and pollen filter assembly (A) from the evaporator.
3. Remove the filter (A) from the housing (B), and replace the filter.
4. Install the filter in the reverse order of removal. Make sure that there is no air leaking out of the
evaporator.
08/08/21 14:43:39 61SNR030_210_0076
ProCarManuals.com
DYNOMITE -2009-


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21-7721-77
Blower Unit Component
Replacement
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
B
A C
BA
6. Disconnect the connector (A) from the recirculation
control motor. Remove the self-tapping screws, the
bolt, the mounting nuts, and the blower unit (B).
7. Install the unit in the reverse order of removal. Make sure that there is no air leakage. Note these items when overhauling the blower unit:
 The recirculation control motor (A), blower motor (B), and the dust and pollen filter (C) can be replaced
without removing the blower unit.
 Before reassembly, make sure that the recirculation control linkage and door move smoothly without
binding.
 After reassembly, make sure the recirculation control motor runs smoothly (see page 21-74).
08/08/21 14:43:40 61SNR030_210_0078
ProCarManuals.com
DYNOMITE -2009-


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21-7721-77
Blower Unit Component
Replacement
6x1.0mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
B
A C
BA
6. Disconnect the connector (A) from the recirculation
control motor. Remove the self-tapping screws, the
bolt, the mounting nuts, and the blower unit (B).
7. Install the unit in the reverse order of removal. Make sure that there is no air leakage. Note these items when overhauling the blower unit:
 The recirculation control motor (A), blower motor (B), and the dust and pollen filter (C) can be replaced
without removing the blower unit.
 Before reassembly, make sure that the recirculation control linkage and door move smoothly without
binding.
 After reassembly, make sure the recirculation control motor runs smoothly (see page 21-74).
08/08/21 14:43:40 61SNR030_210_0078
ProCarManuals.com
DYNOMITE -2009-