DaimlerChrysler LH New Yorker 1994, Электронное руководство по обслуживанию

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BODY DIAGNOSTIC PROCEDURES
WATER LEAKS
Water leaks can be caused by poor sealing, im-
proper body component alignment, body seam poros-
ity, missing plugs, or blocked drain holes. Centrifugal
and gravitational force can cause water to drip from a
location away from the actual leak point, making leak
detection difficult. All body sealing points should be
water tight in normal wet driving conditions. Water
flowing downward from the front of the vehicle should
not enter the passenger or luggage compartment.
Moving sealing surfaces will not always seal water
tight under all conditions. At times, side glass or door
seals will allow water to enter the passenger compart-
ment during high pressure washing or hard driving
rain (severe) conditions. Over compensating on door
or glass adjustments to stop a water leak that occurs
under severe conditions, can cause premature seal
wear and excessive closing or latching effort. After
completing a repair, water test vehicle to verify leak
has stopped before returning vehicle to use.
VISUAL INSPECTION BEFORE WATER LEAK
TESTS
Verify that floor and body plugs are in place, body
drains are clear and body components are properly
aligned and sealed. If component alignment or sealing
is necessary, refer to the appropriate section of this
group for proper procedures.
WATER LEAK TESTS
WARNING: DO NOT USE ELECTRIC SHOP LIGHTS
OR TOOLS IN WATER TEST AREA, PERSONAL IN-
JURY CAN RESULT.
When the conditions causing a water leak has been
determined, simulate the conditions as closely as pos-
sible.
•
If a leak occurs with the vehicle parked in a steady
light rain, flood the leak area with an open ended
garden hose.
•
If a leak occurs while driving at highway speeds in
a steady rain, test the leak area with a reasonable
velocity stream or fan spray of water. Direct the spray
in the direction comparable to actual conditions.
•
If a leak occurs when the vehicle is parked on an
incline, hoist the end or side of the vehicle to simulate
this condition. This method can be used when the
leak occurs when the vehicle accelerates, stops or
turns. If the leak occurs on acceleration, hoist the
front of the vehicle. If the leak occurs when braking,
hoist the back of the vehicle. If the leak occurs on left
turns, hoist the left side of the vehicle. If the leak
occurs on right turns, hoist the right side of the
vehicle. For hoisting recommendations refer to Group
0, Lubrication and Maintenance, General Information
section.
WATER LEAK DETECTION
To detect a water leak point of entry, do a water test
and watch for water tracks or droplets forming on the
inside of the vehicle. If necessary, remove interior
trim covers or panels to gain visual access to the leak
area. If the hose cannot be positioned without being
held, have someone help do the water test.
Some water leaks must be tested for a considerable
length of time to become apparent. When a leak ap-
pears, find the highest point of the water track or
drop. The highest point usually will show the point of
entry. After leak point has been found, repair the leak
and water test to verify that leak has stopped.
Locating the entry point of water that is leaking
into a cavity between panels can be difficult. The
trapped water splashes or runs from the cavity it is
dammed up in, often at a distance from the entry
point. Most water leaks of this type become apparent
after accelerating, stopping, turning, or when on a
incline.
MIRROR INSPECTION METHOD
When a leak point area is visually obstructed, use a
suitable mirror to gain visual access. A mirror can
also be used to deflect light to a limited access area to
assist in locating a leak point.
BRIGHT LIGHT LEAK TEST METHOD
Some water leaks in the luggage compartment can
be detected without water testing. Position the ve-
hicle in a brightly light area. From inside the dark-
ened luggage compartment inspect around seals and
body seams. If necessary, have a helper direct a drop
light over the suspected leak areas around the lug-
gage compartment. If light is visible through a nor-
mally sealed location, water could enter through the
opening.
PRESSURIZED LEAK TEST METHOD
When a water leak into the passenger compartment
can not be detected by water testing, pressurize the
passenger compartment and soap test exterior of the
vehicle. To pressurize the passenger compartment,
close all doors and windows, start engine, and set
heater control to high blower in HEAT position. If
engine can not be started, connect a charger to the
battery to assure adequate voltage to the blower.
With interior pressurized, apply dish detergent solu-
tion to suspected leak area on the exterior of the
vehicle. Apply detergent solution with spray device or
23 - 2 BODY