Acura CSX. Manual - part 496

21-98

Climate Control

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 without

slipping. 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).

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ＳＮＲ９Ａ００Ｇ１０１００００００００ＦＥＡＴ８０

Performance Test

21-99

A/C System Test

• 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 it

cool 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.

08/08/21 14:44:55 61SNR030_210_0100

＊０２

21-100

Climate Control

80 %

HUMIDITY
LEVEL

°C
(°F)

49
(120)

°C
(°F)

33
(92)

25
(77)

14
(57)

VENT
(DELIVERY)
TEMPERATURE

35
(95)

Ambient (Intake) Temperature vs. Vent (Delivery) Temperature

AMBIENT (INTAKE) TEMPERATURE

30 %

28
(32)

17
(62)

8
(47)

31
(87)

22
(72)

19
(67)

11
(52)

6
(42)

3
(37)

0
(32)

46
(115)

43
(110)

41
(105)

38
(100)

32
(90)

29
(85)

27
(80)

24
(75)

21
(70)

18
(65)

16
(60)

10. To complete the vent (delivery)/ambient air (intake) temperature chart:

• Mark the vent (delivery) temperature on the vertical line.
• Mark the ambient air (intake) temperature on the bottom line.
• Draw a vertical line from the ambient air (intake) temperature mark.
• Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.

NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the
measured humidity level. Any measurements outside the line may indicate the need for further inspection.

08/08/21 14:44:55 61SNR030_210_0101

＊０３

21-101

80 %

HUMIDITY
LEVEL

°C
(°F)

49
(120)

psi
(kPa)

350
(2413)

275
(1896)

175
(1207)

HIGH SIDE
(DISCHARGE)
PRESSURE

35
(95)

Ambient (Intake) Temperature vs. High Side (Discharge) Pressure

AMBIENT (INTAKE) TEMPERATURE

30 %

300
(2068)

200
(1379)

125
(862)

325
(2241)

250
(1724)

225
(1551)

150
(1034)

100
(689)

75
(517)

46
(115)

43
(110)

41
(105)

38
(100)

32
(90)

29
(85)

27
(80)

24
(75)

21
(70)

18
(65)

16
(60)

11. To complete the high side (discharge pressure)/ambient air (intake) temperature chart:

• Mark the high side (discharge pressure) temperature on the vertical line.
• Mark the ambient air (intake) temperature on the bottom line.
• Draw a vertical line from the high side (discharge pressure) temperature mark.
• Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.

08/08/21 14:44:56 61SNR030_210_0102

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