Chrysler 2005 Crossfire SRT6 Service Manual page 4264

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in strokes. During the intake stroke, refrigerant vapor is sucked in via the inlet valve (6). If the piston (4) moves in
the counter direction, it delivers the refrigerant vapor via the pressure control valve (7), with the vapor being com-
pressed and heating up, into the refrigerant line to the condenser.
DIAGNOSIS AND TESTING - COMPRESSOR NOISE
When investigating an air conditioning related noise, you must first know the conditions under which the noise
occurs. These conditions include: weather, vehicle speed, transmission in gear or neutral, engine speed, engine
temperature, and any other special conditions. Noises that develop during air conditioning operation can often be
misleading. For example: What sounds like a failed front bearing or connecting rod, may be caused by loose bolts,
nuts, mounting brackets, or a loose compressor clutch assembly.
Drive belts are speed sensitive. At different engine speeds and depending upon belt tension, belts can develop
noises that are mistaken for a compressor noise. Improper belt tension can cause a misleading noise when the
compressor clutch is engaged, which may not occur when the compressor clutch is disengaged. Check the acces-
sory drive belt condition and tension as described in the Cooling section before beginning this procedure.(Refer to
7 - COOLING/ACCESSORY DRIVE - DIAGNOSIS AND TESTING).
1. Select a quiet area for testing. Duplicate the complaint conditions as much as possible. Switch the compressor
on and off several times to clearly identify the compressor noise. Listen to the compressor while the clutch is
engaged and disengaged. Probe the compressor with an engine stethoscope or a long screwdriver with the han-
dle held to your ear to better localize the source of the noise.
2. Loosen all of the compressor mounting hardware
and retighten. Tighten the compressor clutch
mounting nut. Be certain that the clutch coil is
mounted securely to the compressor, and that the
clutch plate and pulley are properly aligned and
have the correct air gap.
3. To duplicate a high-ambient temperature condition (high head pressure), restrict the air flow through the con-
denser. Install a manifold gauge set to be certain that the discharge pressure does not exceed 2760 kPa (400
psi).
4. Check the refrigerant system plumbing for incorrect routing, rubbing or interference, which can cause unusual
noises. Also check the refrigerant lines for kinks or sharp bends that will restrict refrigerant flow, which can cause
noises.
5. If the noise is from opening and closing of the high pressure relief valve, reclaim, evacuate, and recharge the
refrigerant system. If the high pressure relief valve still does not seat properly, replace the a/c compressor. (Refer
to 24 - HEATING & AIR CONDITIONING/PLUMBING/A/C COMPRESSOR - REMOVAL).
6. If the noise is from liquid slugging on the suction line, check the refrigerant oil level and the refrigerant system
charge.
7. If the noise continues, replace the compressor and repeat. (Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING/A/C COMPRESSOR - REMOVAL).
PLUMBING 24 - 135