Piper Arrow IV Turbo Maintenance Manual page 123

CHART 2102. TROUBLESHOOTING (AIR CONDITIONING SYSTEM)
Trouble
Door will not close when
air conditioner switch is
in OFF position.
System produces no
cooling.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
Cause
Faulty relay "K-2."
Electrical
Blown fuse in control
head.
Open circuit breaker.
Broken or disconnected
electrical wire.
Broken or disconneeted
ground wire.
Clutch coil burned out or
disconnected.
Thermostat sensing element
defective.
Blower motor disconnected
or burned out.
Mechanical
Loose or broken drive belt.
Compressor partially or
completely frozen.
Expansion valve stuck in
open position.
1F3
Remedy
Replace relay.
Replace fuse.
Reset circuit breaker.
Check all terminals for
loose connections; cheek
wiring for hidden breaks.
Cheek ground wire to see
if loose, broken, or dis-
connected.
Check current flow to
clutch, replace if in-
operative.
Check thermostat and cabin
comfort control panel.
Check current flow to blower
motor. Repair or replace if
inoperative.
Replace drive belts and/or
tighten to specifications.
Remove compressor for
service or replacement.
Replace expansion valve.
21-00-02
Page 21-04
December 1, 1978