Winnebago 1987-1989 LeSharo Service Manual page 615

DIAGNOSIS OF Ale SYSTEM
CONDITION 6
MOISTURE IN SYSTEM
LOW SIDE NORMAL
LOW SIDE
HAND VALVE
CLOSED
LOW SIDE HOSE
'cONNECTED TO
LOW SIDE SERVICE
CONNECTOR
.AMBIENT>
'TEMP ..
:qso
F.
HIGH SIDE NORMAL
HIGH SIDE HOSE
CONNECTED TO
HIGH SIDE SERVICE
CONNECTOR
Complaint Diagnosis
Cooling is not adequate
NOTE Cooling may be satisfactory during early
morning or late evening hours but is not
adequate during hot part of the day.
Condition
1. Low side gauge reading normal (15-30 psi) but
may drop into vacuum during testing.
2. High side gauge reading normal (205 psi at
95°F) but will drop when low side gauge
reading drops into vacuum. See chart for high
side gauge reading at other ambient
temperatures.
3. Sight glass may show tiny bubbles.
4. Discharge air from evaporator is sharp and cold
but becomes warm when low side gauge
reading drops into a vacuum.
Excessive moisture in system. Desiccant agent
saturated with moisture which is released during
high ambient temperatures. Moisture collects and
freezes in expansion valve and stops refrigerant
flow.
Correction
1. Discharge refrigerant from system.
2. Replace Receiver-Drier.
3. Evacuate system with vacuum pump.
4. Charge system with NEW Refrigerant-12.
5. Operate system and check performance.
N4-9