Winnebago 1987-1989 LeSharo Service Manual page 620

DIAGNOSIS OF Ale SYSTEM
CONDITION 11
DEFECTIVE THERMOSTATIC SWITCH
lOW SIDEGAUGE
COMPRESSOR
CYCLES "ON"
34
p.i
CYCLES "OFF"
28
p.i
LOW SIDE
HAND VALVE
CLOSED
LOW SIDE HOSE
CONNECTED TO
LOW SIDE SERVICE
CONNECTOR
AMBIENT'
, TEMP. 95° F.
HIGH SIDE NORMAL
HIGH SIDE HOSE
CONNECTED TO
HIGH SIDE SERVICE
CONNECTOR
Complaint
Compressor cycles (cuts in and out) too rapidly.
Condition
1. Low side pressure cycle too high with
insufficient range between OFF and ON. Cycle
should be:
Cycle "Off" - 12-15 psi.
Cycle "On" - 36-39 psi.
Cycle Range - 24-28 psi.
2. High side gauge reading Normal (200 psi).
Should be 185-205 psi at ambient temperature
of 95°F. See chart for pressures at other
ambient temperatures.
Diagnosis
Thermostatic switch defective.
Correction
1. Stop engine and turn air conditioner OFF.
2. Remove and discard old thermostatic switch,
install new switch of same type.
3. When installing new Thermostatic Switch,
make certain the capillary tube is installed in
same position and to same depth in
evaporator core as old switch tube.
CAUTION
Do not kink or bend capillary tube sharply (tube
is gas filled).
4. Operate system and check performance of
new thermostatic switch.
N4-14