Daewoo MATIZ Service Manual page 1051

Diagnostic Information and Procedures
Windnoise Diagnosis . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC INFORMATION AND PROCEDURES
WINDNOISE DIAGNOSIS
Caution: An assistant should drive the vehicle while
the technician checks for the location of the wind-
noise, in order to prevent personal injury or vehicle
damage.
A test drive in the vehicle is necessary to accurately de-
termine the location of the windnoise. Often there is a
primary leak and secondary leaks. Failure to repair all
leaks will only reduce the windnoise, not eliminate it.
During the test drive the technician should bring the fol-
lowing items to aid in determining the location of the
windnoise.
D A mechanics stethoscope or vacuum hose
D Masking tape
D Strip caulk
D A china marking pencil
D A screwdriver
Perform the following steps in order to conduct the road
test:
1. Choose a route that includes smooth straight streets
that run in all four directions (north, south, east, and
west).
2. Choose streets with little traffic or noise that would in-
terfere with the test.
3. Drive the vehicle at the speeds at which the noise
was noticed by the customer or until the noise is pro-
duced. Do not exceed legal speed limits.
4. The windnoise is external if any of the following condi-
tions occur:
D The windnoise is caused by the wind.
D The windnoise can be heard with the door glass
lowered and while the vehicle is being driven.
D The windnoise is eliminated when tape is placed
over various moldings and gaps.
DAEWOO M-150 BL2
SECTION 9J
WINDNOISE
TABLE OF CONTENTS
. . . . . 9J-1 Repair Instructions
9J-1 On-Vehicle Service
5. Internal windnoise is air leaving the vehicle and
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Windnoise Repair . . . . . . . . . . . . . . . . . . . . . . . . .
should be repaired in the following manner.
D In order to locate the leak, tape off the body lock
pillar pressure relief valves. This will cause air
pressure to build up inside the vehicle and en-
hance the windnoise.
D Use a stethoscope or a vacuum hose to locate the
leak.
D Temporarily repair the leak with masking tape.
D Continue testing in order to determine if the noise
has been eliminated or if other leaks exist.
D When all leaks have been found, return to the shop
and make permanent repairs with the proper align-
ment techniques and sealing materials.
9J-2
9J-2
9J-2
D109A307