Flutter or Thump Noise from Rear of Vehicle – 2018-2019 Chevrolet GMC Holden

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Service Bulletin Bulletin No.: 17-NA-265
Date: July, 2019
TECHNICAL
Subject: Flutter or Thump Noise from Rear of Vehicle
Brand: Model:
Model Year: Date Breakpoints: Engine: Transmission:
from to from to
Chevrolet Equinox
GMC Terrain 2018 2019 All All
Holden Equinox
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
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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.
Page 2 July, 2019 Bulletin No.: 17-NA-265
Service Procedure
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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.
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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.
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:
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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.
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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.
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4. Install the acoustic insulator block (1) in the middle
of the chamber, between both PRVs.
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5. Install the new 4 valve design PRVs, following the
steps below:
Page 4 July, 2019 Bulletin No.: 17-NA-265
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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.
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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.
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5.3. Seat the bottom of each PRV into the sheet
metal opening, then snap into place at
the top.
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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 sales@lloydslaboratories.com, 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
N/A*
Lloyds Kryptonite Metal
Treatment Life Long Rust
Protection
36502 As Needed
$2.00 (U.S.)**
$2.61 (Canada)**
*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.

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