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24-24
AIR CONDITIONING
tions. Play it safe and use new permanent-type anti-
freeze.
RADIATOR PRESSURE CAP
It is absolutely necessary for the 1965 air-condi-
tioned vehicle to be equipped with a 15 to 16 psi
radiator cap.
A radiator pressure cap testing below these speci-
fications will permit loss of coolant during a hard pull
on a hot day, or in slow moving traffic, or when the
engine is stopped after a fast run on a hot day.
Test the radiator pressure cap, using Tool C-3499
(Fig. 24). Before assembling the adapter and radiator
pressure cap to the pump, dip the radiator cap and
both ends of the adapter into clean water to assure a
tight seal.
Hold the assembled tester in a vertical position
with the radiator cap downward, as shown in Figure
24. Stroke the tester pump plunger until the gauge
indicates the pressure cap is relieving pressure. It
must relieve at a pressure between 15 and 16 psi. If
within these specifications, reinstall on the radiator.
NOTE: These test specifications are for caps tested
at average altitudes. In high altitudes, the test
specifications are lowered about one
(1) psi for each
2,000
feet above sea level.
If the radiator cap does not test within these speci-
fications, replace it with a cap which does.
VACUUM CONTROL SYSTEM
ADJUSTMENTS AND TESTS
Maximum Cool Vacuum
Switch Adjustment
between the cam and the plunger.
1/16"
clearance is necessary for the shaft rotation
NY303
Fig. 24-Radiator
Cap Tetter
1x210
Fig. 25-Recirculation
and Fresh Air Door Linkage
The lack of clearance could break the switch lever,
also too much clearance would fail
to
close the fresh
air door and open the recirculating door in the NO. 3
and 4 positions.
With the blower switch on NO. 4 position, adjust
the vacuum switch by placing a .060 inch spacer be-
tween the cam and the switch plunger. Move the
switch toward or away from the cam. Move the switch
until the plunger is fully depressed, and tighten the
switch in this position and remove the spacer.
Recirculation and Fresh Air Door Linkage
To adjust the fresh air door connecting rod,
re-
move the glove box, push "Cool" button, blower
switch on NO. 4 position. The recirculating door will
be open, and the connecting rod is then readily ac-
cessible.
The connecting rod is provided with a turnbuckle
nut and lock nut (Fig. 25). The fresh air door should
be adjusted to completely closed.
Turn the blower switch to NO. 1 or 2 position and
inspect to see that the recirculating door is fully
closed. Replace the glove box.
Vacuum Control System Test
The test of the push-button operation determines
whether or not the vacuum and electrical circuits are
properly connected and the controls are functioning
properly. However, it i s possible that a vacuum con-
trol system that operates perfectly at the high vacu-
um provided at engine idle speed may not function
properly at high engine speeds. Before starting this
test, stop the engine. Make certain that the vacuum
source hose at the engine intake manifold is tight on
its connector.
Start the vacuum pump, Tool C-3652, and connect
to the vacuum
test
set, Tool C-3707. Adjust the bleed
valve on the test set to obtain exactly
8
inches of vac-
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