Dodge RAM TRUCK 1500 1995 Service Manual page 1684

BR
HEATING AND AIR CONDITIONING 24-15
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INDEX
page page
Compressor Clutch Coil Assembly 16
Compressor Drive Belt . 15
Compressor Manifold . 16
Compressor Noise . . . . . . . . . . . . . . . . . . . . . . . . 15
Compressor Replacement 15
COMPRESSOR NOISE
Excessive noise that occurs when the air condition­
ing is being used, can be caused by:
• Loose bolts
• Mounting brackets
© Loose clutch
• Excessive high refrigerant system operating pres­
sure
Verify compressor drive belt condition, proper re­
frigerant charge and head pressure before compres­
sor repair is performed.
For noise diagnostic procedures, refer to the Com­
pressor Noise and Compressor Clutch Diagnosis
Chart in this section.
COMPRESSOR DRIVE BELT
Belt slippage will reduce air conditioning perfor­
mance and belt life.
Any belt which has operated for a 1/2 hour is con­
sidered a USED belt. Belt tension and condition
should be checked at regular service intervals. Refer
to Group 7 Cooling, for proper adjustment and mea­
surement procedures.
COMPRESSOR REPLACEMENT
The A/C compressor may be removed and reposi­
tioned without discharging the refrigerant system.
Discharging is not necessary if removing the A/C
compressor clutch/coil assembly, engine, cylinder
head or generator.
REVIEW WARNINGS AND CAUTIONS IN
THIS GROUP BEFORE PERFORMING THE
FOLLOWING PROCEDURE.
REMOVAL
(1) Disconnect negative cable from battery.
(2) Remove the serpentine belt (refer to Group 7,
Cooling System).
(3) Disconnect compressor clutch wire lead.
(4) If the compressor must be removed from the ve­
hicle, recover the refrigerant into a recovery/recycle
device (refer to Refrigerant Service Procedures).
(5) Remove the refrigerant lines from the compres­
sor and tape close all openings.
(6) Remove compressor mounting bolts.
(7) Remove compressor. If refrigerant lines were
not removed, lift compressor/clutch assembly and tie
it to a suitable component.
INSTALLATION
If a replacement compressor is being in­
stalled; check the oil level. Add or subtract oil
as necessary and install the magnetic clutch on
the compressor.
COMPRESSOR
NOISE AND COMPRESSOR CLUTCH DIAGNOSIS
COGS8DST50N POSSIBLE CAUSES CORRECTION
COMPRESSOR NOISY 1. Mounting bolts loose.
2. Belt loose.
3. Broken valve plate.
1. Tighten bolt to specified torque.
2. Check belt condition and adjuster.
Replace belt.
3. Replace compressor.
COMPRESSOR CLUTCH
NOISY
1. Refrigerant system overcharged.
2. Incorrect clutch air gap.
3. Clutch bearing.
4. Seized compressor.
5. Oil on clutch from shaft seal.
6. Coil mismounted.
7. Clutch coil partially shorted.
1. Recover, evaluate and recharge system.
2. Set air gap to 0.41 - 0.79 mm
(0.016-0.031 in.).
3. Replace pulley.
4. Replace compressor.
5. Replace compressor.
6. Check coil mounting. \
7. Check amperage. If greater than 4 amps,
replace coil.
J9524-1