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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