CHART 2101, TROUBLESHOOTING (AIR CONDITIONER)
Gauge Indication Probable Causes Remedy
High discharge pressure. Overcharge of refrigerant. Purge excess refrigerant.
Air in system. Check for leaks. Bleed charge
from system. Evacuate and
recharge system.
Overheated condenser due to Clean bugs and dirt from con-
blocking air passage. denser fins. Straighten fins if
bent.
Flooded evaporator indi- Check that capillary bulb is
cated by heavy frosting on securely clamped to suction
suction line and compressor line. If capillary bulb good
suction service valve. replace expansion valve.
Restriction in liquid line Check for kinked hoses and
from condenser. stopped up filter.
Low discharge pressure. Undercharge of refrigerant. Add refrigerant until bubbles
Sight glass shows bubbles or disappear. Check system leaks.
foam.
Damaged compressor valves Replace compressor.
or dirt under valves.
Damaged compressor. Worn Replace compressor.
or broken piston or piston
rings.
Low suction pressure. (Ac- Low air supply through Repair blower or blower
companied by icing evap- evaporator. motor. Clean stoppage in air
orator.) ducts.
Very dirty evaporator fins Clean and flush with water.
and coils.
21 - 52 - 00
Page - 21 - 04
Reissued: August 1, 1986
1F18
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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