Winnebago 1987-1989 LeSharo Service Manual page 611

DIAGNOSIS OF Ale SYSTEM
CONDITION 2
REFRIGERANT EXCESSIVELY LOW
LOW SIDE lOW
lOW SIDE
HAND VALVE
CLOSED
lOW SIDE HOSE
CONNECTED TO
lOW SIDE SERVICE
CONNECTOR
iAMBIENT .;
'J.EMP.-95° ·F.;
HIGH SIDE lOW
HIGH SIDE HOSE
CONNECTED TO
HIGH SIDE SERVICE
CONNECTOR
Complaint
Cooling is not adequate
Condition
1. Low side gauge reading very low. Should be
15-30 psi.
2. High side gauge reading very low. Should be
185-205 psi at ambient temperature of 95°F.
See chart for pressures at other ambient
temperature.
3. No liquid and no bubbles visible in sight glass.
4. Discharge air from evaporator is warm.
Diagnosis
System excessively low on refrigerant. Serious
leak indicated.
Correction
1. Leak test system.
NOTE:
Add partial refrigerant charge before
leak testing to ensure a leak test
indication. a). Leak test compressor seal
area very carefully. b). On cars with
suction throttling valve, valve
diaphragm may be leaking.
2. Discharge refrigerant from system.
3. Repair leaks.
4. Check compressor oil level. System may have
lost oil due to leakage.
5. Evacuate system using vacuum pump.
6. Charge system with NEW Refrigerant-12.
7. Operate system and check performance.
N4-5