Bulletin No.:

Service Bulletin

Date:

17-NA-149
October, 2020

TECHNICAL
Subject:

Water Sloshing in Quarter Panel Area When Accelerating or Stopping and/or Long
Period of Water Draining from Rear Wheel Well After Vehicle is Parked

Brand:

Model:

Buick

Model Year:

VIN:

from

to

Cascada

2016

2019

Opel/
Vauxhall

Cascada

2013

2018

Holden

Cascada

2015

2018

from

to

—

—

Engine:

Transmission:

All

All

Involved Region or Country

North America, Europe, Australia, New Zealand

Condition

Some customers may comment on hearing water sloshing in the right or left quarter panel
area when accelerating or stopping and/or seeing water draining form rear wheel well
area for a long period of time after vehicle is parked.
In some cases, a customer may note that there is water on the floor in the rear of the
vehicle.

Cause

The cause of the condition may be a blocked/clogged rear quarter drain hose or flap,
which may allow water to build up in the quarter window cavity.
Some examples of the cause of blockage have been found to be:
• Drain dust flap painted shut.
• Drain clogged by body sealer/foam.
• Contaminants or debris blocking the drain hole or hose in the quarter window cavity.

Correction

Inspect and open blocked quarter drain flap, and drain hose as necessary following the
Service Procedure below.

Service Procedure

Note: The drain hose (shown circled above) runs from
the quarter window cavity to the wheel well. A blockage
or clog could occur at either end of the hose.

4788754

Copyright 2020 General Motors LLC. All Rights Reserved.

Page 2

October, 2020

Bulletin No.: 17-NA-149

4788761

1. On the affected side of the vehicle, remove the
forward, lower fasteners and pull back a portion of
rear wheelhouse liner to gain access to the quarter
drain dust flap (shown at the arrow). Refer to Rear
Wheelhouse Liner Replacement in SI.

4788769

4788766

Note: Inspect for, and remove, any paint that may be
holding the drain flap (1) shut.

2. Using your finger, flip the drain flap open and watch
for water to drain out.
• If all water drains out, no further correction is
necessary. The rear wheelhouse liner can be
reinstalled.
• If water did not drain out completely and quickly,
reinstall the rear wheelhouse liner, then
proceed ahead to step #3.

Bulletin No.: 17-NA-149

October, 2020

Page 3

4788774

3. Remove the quarter window regulator (1) in order
to gain access to quarter cavity. Refer to Quarter
Window Regulator Replacement in SI.

4788781

4788778

4. Inspect for, and clear, any debris that may be
blocking the drain in the bottom of the cavity.
Capture any debris removed and tag for
warranty return.
5. Test the repair by pouring a small amount of water
into the drain area to ensure it properly drains out.
6. After cleaning, be sure to reinstall the water barrier
before installing the quarter trim.

7. Reinstall the quarter window regulator (1). Refer to
Quarter Window Regulator Replacement in SI.

Page 4

October, 2020

Bulletin No.: 17-NA-149

Parts Information
No parts are required for this repair.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor
Operation

Description

Labor Time

1480808*

Open Blocked Quarter
Drain Flap

0.3 hr

Add

Clear Debris from Hose
Drain

0.9 hr

*This is a unique Labor Operation for bulletin use only.

Version

3

Modified

June 23, 2017 – Added Opel/Vauxhall and Holden models.
October 13, 2020 – Added 2018 Model Year to Opel/Vauxhall and Holden Models, 2018
and 2019 to Buick Model, repositioned Parts and Warranty Tables.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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