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24-26
AIR CONDITIONING
62x682
Fig. 29-Maximum
Cool Vacuum Connector Test
2. To maximum cool vacuum switch
4.
To maximum cool vacuum switch
8. Fresh air door actuator open
9. Fresh air door octuator closed
must be replaced. If excessive vacuum drop shows up
at one
or
more holes in the connector plug, isolate
the faulty hose or actuator.
If the vacuum drop occurs at number 2 or
4
holes
first inspect the connector plug
fit
to the Maximum
Cool Vacuum switch prods (the switch located on
Blower Control). If the vacuum drop is now within
limits, proceed with TEST
1
"Test System Pressure."
If the vacuum drop is still in excess of
Y 4
inch, re-
move the connector plug from the switch. Insert the
vacuum test prod alternately in each of the connector
holes (Fig. 29). Number
8
and 9 hoses operate the
fresh air door actuator. Test whether the actuator or
Fig. 31-Temperature
Selector Switch
lesl
hose is at fault; use the test hose on the actuator in-
volved (Fig. 30).
A
leak in a hose may be detected with the leak
test-
er by running the fingers along the hose and watch-
ing the vacuum gauge reading. A faulty spot may be
cut out and hose spliced, using
YS
inch 00 copper
tubing.
A
vacuum drop in excess of ?4 inch below the
8
inches needed in this test would not interfere with
the engine operation, other than perhaps to cause a
rough idle. It could, however, interfere with the prop-
er operation of the air-conditioning and heating con-
trols at high speeds and during acceleration.
AIR CONDITIONING AND HEATER
TEMPERATURE SELECTOR SWITCH TEST
To test the air conditioning and heater tempera-
ture selector switch, disconnect the small yellow
stripe and green stripe hoses on the outlet side of
!
i
Fig. 3 L V a c u u m Actuator Test (Typical)
Fig. 32--Testing
Switch
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