CHART 2101. TROUBLESHOOTING (AIR CONDITIONER) (cont) .
Gauge Indication Probable Causes Remedy
Low suction pressure. (Evap- Undercharge of refrigerant. Add refrigerant. Install new
orator not cold enough) Moisture freezing in expan- dryer. Evacuate and recharge.
suction gauge may read a sion valve. Valve will show
vacuum indicating evap- frost. Expansion valve inlet Remove screen. Clean with
orator lacks refrigerant. screen clogged. Inoperative solvent and replace. Warm
expansion valve. Valve stuck capillary by holding in hand.
closed or capillary bulb has If suction pressure does not
lost its charge. charge, replace expansion
valve.
Restriction anywhere in Locate restriction and repair.
liquid line, Restriction will
show frost.
High suction pressure. Capillary bulb clamp loose Clean contact surfaces of
on suction line, Suction line suction line and cap bulb.
shows frost. Tighten clamp.
Expansion valve not closing. Replace expansion valve.
Evaporator flooded. Suction
line frosted to compressor.
Compressor drive belt Adjust belt tension.
slipping.
Magnetic clutch slipping. Check electrical circuit for
correct voltage to clutch coil.
Clean clutch surfaces of oil.
Leaking or broken com- Replace compressor.
pressor valves.
21 - 52 - 00
Page - 21 - 05
Reissued: August 1, 1986
1F19
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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