Winnebago 1987-1989 LeSharo Service Manual page 613

DIAGNOSIS OF Ale SYSTEM
CONDITION 4
COMPRESSOR MALFUNCTION
lOW SIDE HIGH
LOW SIDE
HAND VALVE
CLOSED
lOW SIDE HOSE
CONNECTED TO
LOW SIDE SERVICE
CONNECTOR
Complaint
-AMBIENT ~
'1'EMP.-95° ·f."~
HIGH SIDE LOW
NOTE: This symptom is
similar to an open expan-
sion valve. Before condem-
ning compressor, check ex-
pansion valve.
HIGH SIDE HOSE
CONNECTED TO
HIGH SIDE SERVICE
CONNECTOR
Correction
2.
Low side gauge reading too high. Should
be
2.
High side gauge reading too low. Should be
185-205 psi at temperature of 95°F. See Chart
for pressures at other ambient temperatures.
3.
Sight glass free of bubbles (system is fully
4.
4.
Discharge air from evaporator not sufficiently
cool.
Cooling is not adequate.
Condition
Diagnosis
Internal leak in compressor. Reed valves or head
gasket leaking. Compressor pistons, rings, or
cylinders excessively worn or scored.
1. Isolate compressor (systems with high and low
side service valves) or discharge system
(systems without service valves).
Remove compressor cylinder head and inspect
compressor.
a. replace reed valve plate assembly if
necessary.
b. install cylinder head using NEW gasket.
Check compressor oil level.
Replace Receiver-Drier if:
a. System previously opened.
b. System operated two or more seasons
with present unit.
c. Compressor inspection reveals desiccant
particles (very fine golden or brown
particles).
5. Evacuate compressor or evacuate system (if
completely discharged) using vacuum pump.
6. Charge system with NEW Refrigerant-12.
7. Operate system and check performance.
N4-7