2006 ACURA CSX clutch




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µµ
µ
Clearance: 0.35 0.65 mm (0.014 0.026 in.)Field Coil Resistance: 3.15 3.45 20 °C (68 °F)
21-85
A/C Compressor Clutch Check
A
B
A
1. Check the armature plate for discoloration, peeling,or other damage. If there is damage, replace the
clutch set (see page 21-86).
2. Check the rotor pulley bearing play and drag by rotating the rotor pulley by hand. Replace the
clutch set with a new one if it is noisy or has
excessive play/drag (see page 21-86).
3. Measure the clearance between the rotor pulley (A) and the armature plate (B) all the way around. If the
clearance is not within specified limits, remove the
armature plate (see page 21-86) and add or remove
shims as needed to increase or decrease clearance.
NOTE: The shims are available in four thicknesses:
0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm. 4. Check the thermal protector for continuity between
the A/C compressor clutch connector terminals
No. 1 and No. 3. If there is no continuity, replace the
thermal protector (see page 21-87).
NOTE: The thermal protector will have no
continuity above about 122 to 128 °C (252 to 262 °F).
When the temperature drops below about 116 to
104 °C (241 to 219 °F), the thermal protector will
have continuity.
5. Disconnect the field coil connector (A). Check resistance of the field coil. If resistance is not within
specifications, replace the field coil (see page
21-86).
08/08/21 14:43:46 61SNR030_210_0086
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Special Tools Required
21-86
Climate Control
A/C Compressor Clutch Overhaul
25.5 N·m
(2.6 kgf·m, 18.8 lbf·ft)
A
B A
B
A
B A
B
C
D 1.3 N·m
(0.1 kgf·m, 1.0 lbf·ft)
A/C clutch holder, Robinair 10204 or Kent-Moore
J37872, or Honda Tool and Equipment KMT- J33939,
commercially available
1. Remove the center nut while holding the armature plate (A) with a commercially available A/C clutch
holder (B).
2. Remove the armature plate (A) and shim(s) (B), taking care not to lose the shim(s). If the clutch
needs adjustment, increase or decrease the
number and thickness of shims as necessary, then
reinstall the armature plate, and recheck its
clearance (see page 21-85).
NOTE: The shims are available in four thicknesses:
0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm. 3. If you are replacing the field coil, remove the snap
ring (A) with snap ring pliers, then remove the rotor
pulley (B). Be careful not to damage the rotor pulley
and A/C compressor.
4. Remove the bolt and holder (A), then disconnect the field coil connector (B). Remove the snap ring
(C)withsnapringpliers,thenremovethefieldcoil
(D). Be careful not to damage the field coil and A/C
compressor.
5. Reassemble the clutch in the reverse order of disassembly, and note these items:
 Install the field coil with the wire side facing down, and align the boss on the field coil with the
hole in the A/C compressor.
 Clean the rotor pulley and A/C compressor sliding surfaces with contact cleaner or other
non-petroleum solvent.
 Install new snap rings, note the installation direction, and make sure they are fully seated in
the groove.
 Make sure that the rotor pulley turns smoothly after it’s reassembled.
 Route and clamp the wires properly or they can be damaged by the rotor pulley.
08/08/21 14:43:47 61SNR030_210_0087
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Possible Leak AreaDiagnostic Procedure with Fluorescent Dye
21-96Climate Control
Refrigerant Leak Check (cont’d)
NOTE:
 Check for leaks in a dark work area, and use the UV light and the special glasses from the leak check kit. Other UV lights may not work well with the Tracer-Stick
dye.
 Small leaks may take up to 1 week of vehicle operation (with normal A/C use) to become visible.

















Service Ports If a leak is found, replace the Schrader valve on the service port.
A/C Lines Use a permanent marker pen to circle the leak area.
If a leak is found, remove and replace the A/C line (see page 21-8).
Condenser If a leak is found, remove the condenser (see page 21-88). Determine whether leak is in the condenser or the receiver/dryer.
Use a permanent marker pen to circle the leak area.
Replace either the receiver/dryer (see page 21-89), or the condenser
(see page 21-88), depending upon which is leaking.
A/C Compressor Check for leaks at all of the compressor joints, the clutch center, the compressor front housing bolts, and the scroll bolts on the back of the
compressor.
If a leak is found, use a permanent marker pen to circle the leak area.
If the compressor relief valve appears to be leaking, determine whether the
leak is coming from the relief valve, or the joint between the compressor
casing and the valve.
If the leak is from the relief valve, check the A/C system pressures, and refer
to the pressure test table in the A/C system test (see page 21-99). If the leak is
from the casing/valve joint, replace the A/C compressor relief valve (see page
21-87).
If the leak is coming from the suction hose and/or discharge hose fittings on
the compressor, clean the A/C fittings and replace the suction/discharge
fitting O-rings.
For all other compressor leaks, remove and replace the A/C compressor
(see page 21-83).
Evaporator Start checking for evaporator leaks by illuminating the evaporator drain tube area.
If a leak is found, remove theevaporator core (see page 21-78).
Determine whether leak is from evaporator or expansion valve.
Use a permanent marker pen to circle the leak area.
Replace the expansion valve (see page 21-80), or the evaporator core
(see page 21-78), depending upon which is leaking.
08/08/21 14:44:54 61SNR030_210_0097
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21-97
A/C System Noise Check
 Air conditioning refrigerant or lubricant vaporcan irritate your eyes, nose, or throat.
 Be careful when connecting service equipment.
 Do not breathe refrigerant or vapor.
The A/C system noise check will help you determine the
source of abnormal A/C system noise.
NOTE:  If accidental system discharge occurs, ventilate the work area before resuming service.
 Additional health and safety information may be obtained from the refrigerant and lubricant
manufacturers.
 Identify the conditions when the noise occurs. The weather, the vehicle speed, the vehicle being in gear
or in neutral, the engine temperature, or other
conditions may be factors in determining the noise
source.
 Do an A/C system inspection (see page 21-6), and correct any problems found prior to diagnosing
abnormal noises.
 Abnormal A/C noises can be misleading. For example,
a sound similar to a failed bearing may be caused by
loose fasteners, loose mounting brackets, or faulty
compressor clutch assembly.
1. Inspect the air inlet grille in the cowl cover for debris. If debris is present, remove it.
2. Sit inside the vehicle, close the doors and windows, and turn the ignition switch to ON (II), but do not
start the engine. Cycle the HVAC system through all
blower speeds and all air distribution modes to
determine where and when the noise occurs. 3. Operate the blower at each speed with the engine
and A/C off, and check for unusual noises and
excessive vibration. If noise and/or vibration are
present, do the following checks:
–1 If the noise or vibration occurs only in a specific mode or setting, then check these
items: Operation of the mode control motor, door, and linkage
 Operation of the air mix control motor(s), door(s), and linkage
 Operation of the recirculation motor, door, and linkage
–2 If there is a squeaking or chirping noise, but no unusual vibration, replace the blower motor
(see page 21-77).
–3 Remove the blower unit (see page 21-76), and check for foreign material (leaves or twigs, for
example) on the blower motor and fan. If
foreign material is present, remove it, and
recheck for noise. If you don’t find any foreign
material, remove the blower motor (see page
21-77), and check these items: Check if the fan blades are cracked or broken
 Make sure the fan retainer is tight
 Inspect the fan alignment on the blower motor shaft
Replace the blower motor if any problems are
present.
4. Set up the vehicle for the running A/C che cks:
 Select a quiet area for testing
 Apply the parking brake
 Shift the vehicle in PARK or in Neutral
 Start the engine
 Set the temperature control dial to Max Cool
 Set the mode control switch to Vent
 Set the fan control dial to minimum (but not OFF)
 Turn the A/C switch ON
Switch the compressor on and off several times to
clearly identify the sound during A/C compressor
operation. Listen to the noise while the A/C
compressor clutch is engaged and disengaged.
Probe the A/C system with a stethoscope to
pinpoint the noise.
NOTE: If the noise does not change when the A/C
compressor clutch engages or disengages, the
noise may be caused by an engine-related
component. Probe the engine area with a
stethoscope to pinpoint the noise. (cont’d)
08/08/21 14:44:54 61SNR030_210_0098
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21-98Climate Control
A/C System Noise Check (cont’d)
5. Turn the ignition switch to LOCK (0), and check the
drive belt for excessive wear, oil contamination,
improper routing, or a faulty belt tensioner
(see page 4-30). Correct any problems found. Start
the engine, run the A/C system, and check if the
noise is coming from the drive belt, the belt
tensioner or any of the pulleys. Repair or replace
any faulty components.
6. Listen for noises coming from the A/C lines, the A/C hoses, the condenser, the evaporator, the receiver/
drier, or the expansion valve, and check these
items:
 Noises caused by A/C components touching other components or the body. Reroute or
insulate the A/C component(s) as needed, and
recheck for noise.
 Loose, damaged or excessively worn A/C components or mounting hardware. Repair or
replace the faulty component(s) or hardware, and
recheck for noise.
 A moaning noise coming from the A/C suction line. If there is a moaning noise, check the
system refrigerant charge (see page 21-92). If the
refrigerant charge is OK, replace the receiver/
dryer.
7. Check the operation of the A/C compressor clutch:  Make sure compressor clutch engages withoutslipping. If the clutch does not engage,
troubleshoot the A/C compressor clutch circuit
(see page 21-62). If the compressor clutch slips,
replace the complete clutch assembly (see page
21-86).
 Make sure the compressor clutch disengages. If the clutch does not disengage, do the A/C
compressor clutch check (see page 21-85). If the
compressor clutch is OK, replace the A/C
compressor (see page 21-83).
 Make sure the compressor clutch cycles normally. If the compressor clutch is cycling rapidly, the
A/C system is probably low on refrigerant due to
a leak. Do the refrigerant leak check (see page
21-93). If the refrigerant charge is OK, and there
are no leaks, troubleshoot the A/C compressor
clutch circuit. 8. Listen with a stethoscope for noises coming from
the A/C compressor, and check these items:
 The noise changes when the compressor clutch disengages. If the noise does not change when
the A/C compressor disengages, the noise may
be caused by an engine-related component.
Probe the engine area with a stethoscope to
pinpoint the noise.
 The A/C system operating pressures are normal. If the system pressures are abnormal,
troubleshoot the problem using the pressure test
table in the A/C system check (see page 21-99).
Correct the pressure-related problem(s), and
recheck for noise.
 The compressor hose connections, mounting brackets, and fasteners are in good condition. If
any of these components are loose, damaged, or
excessively worn, repair or replace the faulty
component(s), and recheck for noise. If these
components are in good condition, and the noise
is still present, replace the A/C compressor
(see page 21-83).
08/08/21 14:44:54 61SNR030_210_0099
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Performance Test
21-99
A/C System Test
A
B
 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 performance test will help determine if the A/C
system is operating within specifications.
NOTE:  If accidental system discharge occurs, ventilate the work area before resuming service.
 Additional health and safety information may be obtained from the refrigerant and lubricant
manufacturers.
1. Do the A/C system inspection (see page 21-6), and correct any problems found.
2. Connect an R-134a refrigerant recovery/recycling/ charging station to the high-pressure service port
and the low-pressure service port, following the
equipment manufacturer’s instructions.
3. Determine the relative humidity and air temperature.
4. Open the glove box. Remove the glove box stop on each side, then let the glove box hang down
(see page 20-104).
5. Insert a thermometer (A) in the center vent. 6. Place a thermometer (B) near the blower unit’s
recirculation inlet duct.
7. Test conditions:  Move the vehicle out of direct sunlight and let itcool down to the surrounding (ambient)
temperature. If necessary, wash the vehicle to
cool it down more quickly.
 The ambient temperature must be at least 16 °C (60 °F).
 Open the hood.
 Open the front doors.
 Set the temperature control dial to Max Cool, the mode control switch to Vent, and the
recirculation control switch to Recirculate.
 Turn the A/C switch ON and the fan switch to Max.
 Hold the engine speed at 1,500 rpm.
 No driver or passengers in the vehicle.
8. Inspect the A/C components for the following conditions:
 A/C compressor clutch not engaged.
 Abnormal frost areas.
 Unusual noises.
If you observe any of these conditions, refer to the
Symptom Troubleshooting Index.
9. After running the air conditioning for 10 minutes under the above test conditions, read the delivery
temperature from the thermometer in the center
vent, the intake temperature near the blower unit,
and the discharge (high) and suction (low)
pressures on the A/C gauges.
(cont’d)
08/08/21 14:44:55 61SNR030_210_0100
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Pressure Test
Test results Related symptoms Probable causeRemedy
21-103






Suction and
discharge pressures
are normal
Warm air from the vents. The A/C system
contains too much
refrigerant oil.
The air mix door is
not operating
properly.Recover refrigerant (see page 21-90)
and evacuate the system (see page
21-91). Adjust the amount of oil in
the system, then recharge the
system (see page 21-92).
Check air mix door operation
(see page 21-72), and repair as
needed.
Suction and
discharge pressures
are roughly equal
and steady The suction and
discharge pressures
equalize when the engine
is revved. The A/C compressor
clutch or the drive
belt is slipping, or the
compressor shaft
seal is leaking.Check whether the A/C compressor
clutch or the drive belt is slipping.
If the drive belt is slipping, replace
the drive belt (see page 4-31). Also
inspect the drive belt auto-tensioner
(see page 4-31).
If the A/C compressor clutch is
slipping, replace it (see page 21-86).
Check the A/C compressor shaft seal.
If it’s leaking, replace the A/C
compressor (see page 21-83).
Suction and
discharge pressures
are roughly equal but
fluctuate Suction and discharge
pressures fluctuate while
running. Pressures
equalize as soon as the
A/C compressor
disengages. The compressor
discharge valve or
the compressor
gasket is faulty.
Replace the A/C compressor (see page
21-83).
Suction and
discharge pressures
are roughly equal
and abnormally low The suction and
discharge pressures do
not change during
continued operation. The A/C system is
undercharged.
Recover refrigerant (see page 21-90),
then do the refrigerant leak check
(see page 21-93). Repair any leaks,
then recharge the system (see page
21-92).
Suction and
discharge pressures
are abnormally high,
but normalize when
the condenser is
cooled The suction pressure
decreases when cool
water is sprayed on the
A/C condenser.
The A/C system is
overcharged.
Recover refrigerant (see page 21-90),
evacuate the system (see page 21-91),
and recharge the system to
specifications (see page 21-92).
(cont’d)
08/08/21 14:44:56 61SNR030_210_0104
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22-7
Relay and Control Unit Locations
Engine Compartment
ABS MODULATOR-CONTROL UNIT
(’06-07 Touring and Premium models) or
VSA MODULATOR-CONTROL UNIT
(’07 TYPE S and ’08-09 models)
ECM/PCM
A/C CONDENSER FAN RELAY FAN CONTROL RELAY
BLOWER MOTOR RELAYPOWERMIRRORDEFOGGERRELAY
PGM-FI SUBRELAY
REAR WINDOW DEFOGGER RELAY
IGNITION COIL RELAY
A/C COMPRESSOR CLUTCH RELAY
UNDER-HOOD FUSE/RELAY BOX
PGM-FI MAIN RELAY 1
(FI MAIN) RADIATOR FAN RELAY
ELECTRONIC THROTTLE CONTROL
SYSTEM (ETCS) CONTROL RELAY
ELECTRICAL LOAD DETECTOR (ELD)
08/08/21 14:22:06 61SNR030_220_0009
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