Piper PA-44-180 SEMINOLE Maintenance Manual page 161

CHART 2104. TROUBLESHOOTING (AIR CONDITIONER)
Gauge Indication
High suction pressure.
Trouble
System produces no cooling.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Probable Causes
Capillary bulb clamp loose on
suction line. Suction line shows
frost.
Expansion valve not closing.
Evaporator flooded. Suction
line frosted to compressor.
Compressor drive belt slipping.
Magnetic clutch slipping.
Leaking or broken compressor
valve.
Causes
Electrical.
Blown fuse in control head.
Open circuit breaker.
Broken or disconnected
electrical wire.
Broken or disconnected ground
wire.
Clutch coil burned out or
disconnected.
Thermostat sensing element
defective.
Blower motor disconnected or
burned out.
1G17
Remedy
Clean contact surface of
suction line and cap bulb.
Tighten clamp.
Replace expansion valve.
Adjust belt tension.
Check electrical circuit for
correct voltage to clutch coil.
Clean clutch surfaces of oil.
Replace compressor.
Remedy
Replace fuse.
Reset circuit breaker.
Check all terminals for loose
connections, check wiring for
hidden breaks.
Check ground wire to see if
loose, broken, or disconnected.
Check current flow to clutch,
replace if inoperative.
Check thermostat and cabin
comfort control panel.
Check current flow to blower
motor. Repair or replace if
inoperative.
Page 21-50
Revised: May 15, 1989
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