412-00-37 Climate Control System — General Information 412-00-37
DIAGNOSIS AND TESTING (CONTINUED)
• Clutch on time - too short
• Clutch off time - too short
Fault present: not enough refrigerant in the sys-
tem.
Symptom Chart - Refrigerant Circuit
High-
pressure
Low-
pressure
Clutch cycle
times: cycle
Clutch cycle
times: on-
time
Clutch cycle
times: off-
time
Fault cause/action
Too high Too high
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Condenser contaminated
Too high
Normal to
too high
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Engine overheated
Normal to
too high
Normal
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Air or contaminants in the
circuit. Too much refrigerant
in the system.
Normal Too high
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Fixed orifice tube, O-rings
damaged or leaking
Normal Normal Too slow
Too long or
constantly
Normal or
not at all
Contaminants in the circuit
or too much refrigerant oil
Normal Too low Too slow Too long Too long Low-pressure switch faulty
Normal to
too low
Too high
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor faulty
Normal to
too low
Normal to
too high
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Low-pressure line blocked
Normal to
too low
Normal Too fast Too short Normal Evaporator blocked
Normal to
too low
Normal Too fast Too short
Normal to
too long
Condenser, fixed orifice
tube or high-pressure line
blocked
Normal to
too low
Normal Too fast Too short Too short
Not enough refrigerant in
the system
Normal to
too low
Normal Too fast Too short Too long
Evaporator input line
blocked
Normal to
too low
Too low
Compressor
running con-
stantly
Compressor
running con-
stantly
Compressor
running con-
stantly
Low-pressure line
- -
Irregular op-
eration or in-
operative
Irregular op-
eration or in-
operative
Irregular op-
eration or in-
operative
Low-pressure switch con-
tacts dirty or permanently
open. Connector of low-
pressure switch or com-
pressor clutch dirty or dam-
aged.
E9425 EN 07/2001 2002 Bantam
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