Piper Cherokee Six - Page 715

Low
suction
pressure.
(Evaporator
not cold
enough)
suction gauge
may
read
a vacuum
in-
dicating
evaporator
lacks refrigerant.
Undercharge
of
refrigerant.
Moisture
freezing
in expansion
valve. Valve
will
show
frost.
Expansion
valve
inlet
screen
clogged.
Inoperative
expansion
valve.
Valve
stuck
closed
or capillary
bulb
has lost
its
charge.
High
suction
pressure.
PIPER CHEROKEE
SIX SERVICE
MANUAL
TABLE
XIII-IV.
TROUBLESHOOTING
CHART
(AIR
CONDITION)
(cont.)
Remedy
Gauge Indication
Probable
Causes
Low
suction
pressure.
(Accompanied
by icing
evaporator.)
Low
air supply
through
evaporator.
Repair
blower
or
blower
motor.
Clean
stoppage
in
air
ducts.
Very
dirty
evaporator
fins
and
coils.
Clean
and
flush
with
water.
Add refrigerant.
Install
new
driver.
Evacuate
and
recharge
13-13
and
13-14.
Remove
screen.
Clean
with
solvent
and
replace.
Warm
capillary
by holding
in
hand.
If suction
pressure
does
not
charge.
replace
ex-
pansion
valve.
Restriction
anywhere
in liquid
line.
Re-
striction
will
show
frost.
Locate
restriction.
and
repair
Capillar-
bulb
clamp
loose
on suction
line.
Suction
line
shows
frost.
Expansion
valve
not
closing.
Evaporator
flooded.
Suction
line
frosted
to compressor.
Clean
contact
surfaces
of
suction
line and
cap bulb.
Tighten
clamp
Replace
expansion
valve.
CCESSORIES
AND
UTILITIES
sued:
8/17/72
311