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AIR CONDITIONING
24-9
Normal Cooling ICooling with Fresh Air)
When the temperature is comfortable, turn the
"blower" switch to the NO. 2 position (medium speed
fresh air). If less cooling is desired turn the "blower"
switch to the NO. 1 position (low speed fresh air). Re-
adjust the upper outlets to obtain indirect cooling and
maintain comfort. If warmer air is desired, move the
temperature control lever down. If desired the side
outlets and floor outlets can be manually closed.
Cooling for Special Conditions
If the outside air is extremely humid or too warm
for fresh air cooling, turn the "blower" switch to the
NO. 3 position (medium recirculated air). This is also
recommended when driving through areas which are
extremely dusty or have objectionable odors.
Use your air conditioner during the hay fever sea-
son to filter out the pollen and enjoy driving in com-
plete comfort, choosing any of the four "blower"
switch positions to suit the cooling requirements.
Off-season Operation
During the off-cooling season, suggest to owners
that they operate the air-conditioning system for at
least a few minutes once a week, with the "cool" but-
ton in and the temperature control lever in the
"warm" position. This will cause the air-conditioning
compressor to pump oil to the compressor seal, pre-
venting the seal from drying out and causing loss of
refrigerant.
Antifreeze Required for
Summer Operation
Air conditioned vehicles must be protected with
permanent type anti-freeze during the summer to
+15" or lower to prevent the heater core from freez-
ing.
Do not use the same anti-freeze for more than
one year.
Bug Screens
Bug screens should not be installed on vehicles
equipped with air conditioning. A bug screen installed
in front of the condenser will reduce air flow and
affect air conditioning performance. Under severe
heat conditions a bug screen may cause the engine to
overheat.
Satisfactory performance of the combined air-con-
ditioning and heating system is dependent upon prop-
er
operation and adjustment of all operating controls,
as well as proper functioning of all refrigeration sys-
tem units. The inspections, tests and adjustments
should be used to locate the cause of a malfunction.
The inspection and
tests
have been arranged in a
logical sequence that has proved to be the surest and
shortest route to accurate diagnosis. It is recom-
mended that they be followed and performed in the
order in which they are presented.
BLOWER SWITCH CHART
COOL
HEAT
MAX. COOL*
1
2
3
4
LOW
MED.
MED.
HIGH
~~
OFF
OFF
OFF
OFF
OFF
HEAT
ON
ON
OFF
OFF
DEFROST
ON
ON
OFF
OFF
COOL
ON
ON
ON
ON
*The design of the blower control electrical circuit
prevents the blower operation in the position NO.
3
and
4
except when the cool button is depressed.
Operation of All Controls IAR-I,
2)
Operating controls must be tested as described in
the following sequence:
(1) Inspect the compressor drive belt tension and
adjust if necessary. Remove the radiator cap.
(2) Start the engine and adjust the engine speed to
1250 rpm. Use a reliable tachometer.
(3) Push the "Cool" button in, and move the tem-
perature control lever to the top.
(4)
Test the blower operation at all four positions.
(See "Blower Switch Chart.")
If the blower does not operate correctly, refer to
"Electrical Control Circuit" (Fig. 10). Leave the blow-
er in the NO. 2 position.
(5) The compressor clutch should be engaged, the
compressor operating, and the air conditioning sys-
tem in operation. If the clutch does not engage, test
the circuit. Refer to "Electrical Control Circuit"
(Fig. 10).
Push Button Operation
Reduce the engine speed to normal idle. With the
engine operating at idle speed, the vacuum will be
high and the vacuum actuators should operate quick-
ly. If the actuator operation is slow, inspect the source
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