Service Bulletin

Bulletin No.:

17-NA-265

Date:

July, 2019

TECHNICAL
Subject:

Flutter or Thump Noise from Rear of Vehicle

Brand:

Model:

Chevrolet

Equinox

GMC

Terrain

Holden

Equinox

Model Year:

Date Breakpoints:

from

to

2018

2019

from

Engine:

Transmission:

All

All

to

Involved Region or Country

North America, Middle East, Israel, South America, South Korea, Thailand, Egypt, Africa,
Australia and New Zealand

Condition

Some customers may comment on hearing a flutter or thump noise from the rear of the
vehicle. The noise is most noticeable while driving above 40 km/h (25 mph), with the
HVAC off, or in recirculation mode.

Cause

The cause of the condition may be the rear pressure relief valves (PRVs) opening and
closing.

Correction

5376156

Note: The installation of an acoustic insulator panel (1) and block (2) will help to dampen
the noise. Some vehicles may already have an insulator panel and block installed
during production.
Verify the condition and inspect for the existence of a rear acoustic insulator panel and
block installed on the vehicle. Replace the rear PRVs with the new 4 valve design PRVs
and add the insulator panel/block as necessary, following the repair steps in the Service
Procedure below.

Copyright 2019 General Motors LLC. All Rights Reserved.

Page 2

July, 2019

Service Procedure

Bulletin No.: 17-NA-265

3. Install the acoustic insulator panel along the
backside of the chamber between the rear body
panel and the inner rear panel, following these
steps:

4849172

1. Remove the rear fascia and both original rear
pressure relief valves (PRVs) (1). Refer to the
appropriate Body Pressure Relief Valve
Replacement procedure in SI.

4849174

Note: The current design insulator panel has a
different shape than the first design insulator shown in
the graphic above. The shape is correctly shown in the
illustration in the Correction section.
3.1. Slide the insulator panel (1) into one of the
PRV openings.

4886513

2. Inspect for the existence of a foam insulator panel
(1) installed on the vehicle.
• If the insulator panel is NOT visible, continue to
step #3 and complete the installation of the
insulator panel and block.
• If the insulator panel IS visible, jump ahead to
step #5 for installation of the new 4 valve
design PRVs.

4849177

Important: Ensure that the insulator panel is centered
and DOES NOT BLOCK any of the holes in the body.
3.2. Center the insulator along the back side of the
chamber.
3.3. Tuck the outside edges of the panel into the
corners.

Bulletin No.: 17-NA-265

July, 2019

Page 3

4849178

4. Install the acoustic insulator block (1) in the middle
of the chamber, between both PRVs.

4886514

5. Install the new 4 valve design PRVs, following the
steps below:

Page 4

July, 2019

Bulletin No.: 17-NA-265

4886516

Note: The sheet metal tabs should be ground/cut off to
be flush with the top edge of the opening.
5.1. Using a die grinder or air body saw, remove
the sheet metal tab located at the top of
EACH PRV opening.

4886517

5.2. Apply Lloyds Kryptonite Metal Treatment
P/N 36502 Life Long Rust Protection
(14 ounce aerosol), or equivalent rust
inhibitor, to the bare metal areas.

Bulletin No.: 17-NA-265

July, 2019

Page 5

4886519

5.3. Seat the bottom of each PRV into the sheet
metal opening, then snap into place at
the top.

4886521

6. Reinstall the rear fascia. Refer to the appropriate
Rear Bumper Fascia Replacement procedure,
in SI.

Page 6

July, 2019

Bulletin No.: 17-NA-265

Parts Information
Dealers can obtain 36502 by contacting Lloyds by
e-mail at [email protected], or by calling
1-800-361-6766.
Causal Part

Description

Part Number

Qty

Material Allowance

N/A*

INSULATOR-R/END LWR PNL
REINF

84553675

1

N/A

N/A*

INSULATOR ASM-BODY
RR PNL

84539985

1

N/A

X

VALVE,QTR OTR PNL
PRESS RLF

22788177

2

N/A

36502

As Needed

$2.00 (U.S.)**
$2.61 (Canada)**

N/A*

Lloyds Kryptonite Metal
Treatment Life Long Rust
Protection

*For warranty transactions, DO NOT mark this/these parts as the Causal Part. Enter the word “Bulletin” in the Causal Part
Description free-flow text field.
** Submit as Net Item Miscellaneous

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

Description

Labor Time

1480868*

Inspect for Rear Insulators
Installation, Replace
Rear PRVs

1.6 hrs

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

Version

4

Modified

Released August 21, 2017
Revised October 25, 2017 – Updated Service Procedure and Parts information
Revised July 26, 2018 – Added 2019 Model Year and Updated the Parts Information.
Revised July 22, 2019 – Added Holden Model, Updated Correction Graphic and
Corrected Part Supersessions in Parts Information.

Added Key Word Search: Rattle, Vent.

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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