Piper Cherokee Six Service Manual page 714

PIPER CHEROKEE SIX SERVICE MANUAL
TABLE XIII-IV. TROUBLESHOOTING CHART (AIR CONDITIONER)
Gauge Indication
Probable Causes Remedy
High discharge pressure.
Overcharge of re-
frigerant.
Purge excess refrigerant.
Air in system.
Overheated condenser
due to blocking air
passage.
Flooded evaporator
indicated by heavy
frosting on suction
line and compressor
suction service valve.
Restriction in liquid
line from condenser.
Check for leaks. Bleed
charge from system.
Evacuate and recharge
system 13-13 and 13-14.
Clean bugs and dirt
from condenser fins.
Straighten fins if bent.
Check that capillary
bulb is securely
clamped to suction
line. If capillary
bulb OK replace
expansion valve.
Check for kinked hoses
and stopped up filter.
Low discharge pressure.
Undercharge of re-
frigerant. Sight glass
shows bubbles or foam.
Damaged compressor
valves or dirt under
valves.
Damaged compressor.
Worn or broken piston
or piston rings.
Add refrigerant until
bubbles disappear.
Check
system leaks 13-9. 13-10
and 3- 11.
Replace compressor.
13-18.
Replace compressor.
13-18.
ACCESSORIES AND UTILITIES
Revised 11 4 8
3H24