Air Conditioning Performance Diagnosis - Jeep 1979 CJ-5 Technical & Service Manual

AIR CONDITIONING 3E-19
Performance Diagnosis—All Models
Condition
Possible Cause
Correction
COMPRESSOR NOISE
(1)
Broken valves.
a)
Replace valve plate.
(2)
Overcharged.
(2)
Discharge, evacuate, and install
correct charge.
(3)
Incorrect oil level.
(3)
Isolate compressor and check oil
level. Correct as necessary.
(4)
Piston slap.
(4)
Replace compressor.
(5)
Broken rings.
(5)
Replace compressor.
EXCESSIVE
VIBRATION
(1)
Incorrect belt tension.
(1)
Set belt tension. Refer t o
Compressor Belt Tension
(2)
Clutch loose.
(2) Tighten clutch.
(3)
Overcharged.
(3)
Discharge, evacuate, and install
correct charge.
(4) Pulley misaligned.
(4)
Align pulley.
CONDENSATION
DRIPPING
IN PASSENGER
COMPARTMENT
(1)
(2)
Drain hose plugged or
improperly positioned.
Insulation removed or
improperly installed.
(1)
(2)
Clean drain hose and check for
proper installation.
Replace insulation on expansion
valve and hoses.
FROZEN
EVAPORATOR COIL
(1)
(2)
Faulty thermostat.
Thermostat capillary tube
improperly installed.
(!)
(2)
Replace thermostat.
Install capillary tube correctly.
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