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DOORS
6-83
that the hoses are properly connected and free of
defects. The faster bubbles appear in the water,
the more severe is the air leak. In most cases,
where the air leak rate is slower than one bubble
every fifteen seconds, the vacuum loss is usually
insufficient to affect the operation of the vacuum
locking system.
d. Isolating a Leaking Vacuum Part (External
Leak) Using the Leak-Down Testing Device:
After a specific part has been isolated as a leaking
component, first check the hose color-coded red
that attaches to that part. Make sure hose is prop-
erly installed to the port and that hose is not split.
When the testing device has been properly installed
and storage tank recharged, watch glass tube in
testing device and proceed as follows:
1. If water rises in glass tube, storage tank is
leaking. Replace vacuum storage tank.
2. If bubbles appear in water, an air leak is
present in either the remote control valve or
in one of the door lock selector valves.
3. Remove right and left front door hinge pillar
conduits.
4. Pinch right and left, vacuum hose color coded
red.
NOTE:
This has eliminated the right and left
door lock selector valves from vacuum system.
5. Check testing device. If bubbles continue to
appear in water, the remote control valve is
leaking. (If bubbles stop, see step 6).
6. If bubbles stop forming in testing device, air
leak is at either door valve. Discontinue pinch-
ing left valve hose at hinge pillar.
7. Check testing device. If bubbles appear in
water, left door valve is leaking. (If no bubbles
appear, see step 8).
NOTE:
Before replacing a door lock selector
valve, tighten screws on back of valve, then
recheck valve. If valve continues to leak, re-
place left door lock selector valve assembly.
8. If no bubbles appear in testing device after
discontinuing pinching of left valve hose, then
air leak is at right door valve. This may be
shown by discontinuing pinching of right valve
hose at hinge pillar. Bubbles will appear im-
mediately in water of testing device.
VACUUM DOOR LOCK DIAGNOSIS
CHART (Ref. Fig. 6-107)
CONDITION
A. System inoperative
B. All doors can be locked but
not unlocked.
APPARENT CAUSE
1. Hoses crossed at vacuum sup-
ply tank.
2. Vacuum supply hose pinched
at remote valve.
3. D o o r
v a l v e
supply
h o s e
pinched at remote valve.
4. Vacuum supply hose discon-
nected at tank, remote valve,
or engine.
5. R e m o t e
valve
diaphragm
leaking.
1. Main supply hose crossed lock
supply hose at remote valve.
2. Unlock selector hose or supply
hose disconnected at remote
valve.
REPAIR
Reverse hoses at vacuum supply
tank.
Straighten hose at " B " (Red).
Straighten hose at " B " (Red).
Install hose at "A" or " B " (Red).
Replace remote valve at
"B".
Reverse hoses at remote
"B"
(Red and Green).
Hook up hose at remote
"B"
(White).
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