Excessive Windshield Condensation, HVAC Defrost Door Flutter Type Noise Heard – 2016-2019 Chevrolet Camaro

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Service Bulletin Bulletin No.: 17-NA-201
Date: July, 2019
TECHNICAL
Subject: Excessive Windshield Condensation, HVAC Defrost Door Flutter Type Noise Heard
Brand: Model:
Model Year: Breakpoint:
Engine: Transmission:
from to from to
Chevrolet Camaro 2016 2019 SOP
April 01,
2017*
*Vehicles
built after
this date DO
NOT have
pads on the
HVAC
defrost
doors.
Involved Region or Country North America, Europe, Russia, Middle East, Israel, South America, Japan, South Korea,
China, Thailand
Condition
Some customers may comment on one of the following conditions:
Condition 1
Some customers may comment on a flutter type noise heard from the HVAC when in
manual mode and set to either floor or tri-level mode.
Condition 2
Some customers may comment on excessive condensation on the windshield above the
center defrost vents.
Note: For vehicles built AFTER the Breakpoint listed in the table and have customers
commenting on a condensation issue, they need to refer to the Additional Information
section of this bulletin.
Cause
Condition 1
This condition may be caused by the HVAC door making contact to the case during high
fan speed.
Page 2 July, 2019 Bulletin No.: 17-NA-201
Condition 2
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This condition may be caused by the foam pads on the defrost door allowing too much air
to pass through, causing excessive condensation on the outside of the windshield.
Note: During extremely humid conditions, some condensation can be considered
normal.
Additional Information:
In certain settings, the system is designed to bleed air to the windshield to prevent it from
fogging/freezing in cold weather conditions where the ambient temperature is extremely
cold and the inside cabin temperature is hot.
The best recommendation for customer comfort, and to prevent condensation during hot/
humid ambient conditions and cold cabin air, is to place the AC in “auto” or manually set it
to the “bi-level” (floor and vent/face/dash) position. The recommended temperature
setting is between 20-22°C (68-72°F).
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The table shown above helps to understand the function of the HVAC as it relates to the
customer settings.
• OSA = Outside Air
• Rec = Recirculated Air
• F/C = Full Cold
• F/H = Full Hot
Bulletin No.: 17-NA-201 July, 2019 Page 3
Correction
Condition 1
An updated software calibration has been released to address the flutter type noise
condition.
Condition 2
For vehicles built prior to the Breakpoint listed in the table, remove both foam pads
located on the defrost door to address the excessive windshield condensation then
update the software to address the flutter issue that results when the foam is removed.
Service Procedure
Condition 1
Note: Stable battery voltage is critical during
programming. Any fluctuation, spiking, over voltage or
loss of voltage will interrupt programming. Install a GM
Authorized Programming Support Tool to maintain
system voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12 V jumper or booster pack disconnected
from the AC voltage supply. DO NOTconnect a battery
charger.
Reprogram the HVAC system control module with the
latest calibrations available on TIS2WEB. Refer to
HVAC System Control Module Reprogramming with
SPS in SI.
Condition 2
Preparation/Tool
• Boroscope
• Grippers / Fingers tool
• Metal coat hanger / Mechanics wire
• Zip ties
• 12” clear tube 5/16” OD x 3/16” ID
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Page 4 July, 2019 Bulletin No.: 17-NA-201
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Bend the wire 120°, as shown above, and zip tie the
grippers/fingers tool to hold the shape/angle needed to
reach the foam pads on the defrost door.
Note: It is important to have the ends of the wire bent
outwards to provide a handle to help maneuver the
fingers into place.
1. Remove both windshield garnish moldings. Refer
to Windshield Garnish Molding Replacement in SI.
2. Remove the windshield. Refer to Windshield
Replacement in SI.
3. Place the HVAC mode in “Floor” or
“Tri-Level” mode.
Note: This mode will hold the door in the best position
to reach the foam pads.
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4. Going through the center defrost vents, position
the boroscope so the 10 mm x 10 mm foam pads
can be seen.
Bulletin No.: 17-NA-201 July, 2019 Page 5
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5. Using the boroscope to view the pad, insert the
30 cm (12 in) clear tube (recommend 5/16” OD x
3/16” ID) on top of the foam pad.
6. With the boroscope and clear tube in place, have
an assistant pour approximately 30-60 ml (1-2 oz)
of Kent Acrysol P20005 or equivalent in the
clear tube.
Important: DO NOT use more than 30-60 ml (1-2 oz)
of fluid to prevent excess fluid seeping into the HVAC
case. Remove the clear tube as soon as the fluid is
absorbed by the foam pads.
Important: DO NOT remove the boroscope.
7. Wait 60 seconds for the foam pads to absorb the
Acrysol.
8. With the boroscope in place, use the grippers/
fingers to grab and remove the foam pad.
9. Remove the grippers/fingers and boroscope.
10. Repeat steps 3–9 to remove the 2nd foam pad.
11. To eliminate any odor from the Acrysol, run the
vehicle in the following mode:
11.1. Windows Open
11.2. Tri-Level HVAC mode (all 3 buttons lit –
defrost, vent and floor)
11.3. A/C Off
11.4. Blower = max.
11.5. Temp 24°C (75°F)
Note: Stable battery voltage is critical during
programming. Any fluctuation, spiking, over voltage or
loss of voltage will interrupt programming. Install a GM
Authorized Programming Support Tool to maintain
system voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12 V jumper or booster pack disconnected
from the AC voltage supply. DO NOTconnect a battery
charger.
12. Reprogram the HVAC system control module with
the latest calibrations available on TIS2WEB.
Refer to HVAC System Control Module
Reprogramming with SPS in SI.
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
2881238* HVAC System Control
Module Reprogramming for
Flutter Noise
0.3 hr
4480628* Removing Both Foam Pads
From the Defrost Door
1.5 hrs
*This is a unique Labor Operation for Bulletin use only.
*To avoid warranty transaction rejections, carefully read and
follow the instructions below.
• The VIN and the job card number on the transaction
must match the VIN and job card number associated
with the reprogramming event in the SPS system
• The SPS Warranty Claim Code must be accurately
entered in the “SPS Warranty Claim Code” field of the
transaction
• When more than one Warranty Claim Code is generated
for a programming event, it is required to document all
Warranty Claim Codes in the “Correction” field on the job
card. Dealers must also enter one of the codes in the
“SPS Warranty Claim Code” field of the transaction,
otherwise the transaction will reject. It is best practice to
enter the FINAL code provided by SPS.
Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on
the Job Card, the code can be retrieved in the SPS
system as follows:
1. Open TIS on the computer used to program the
vehicle.
2. Select and start SPS.
3. Select Settings.
4. Select the Warranty Claim Code tab.
The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the
transaction making sure to include the code in the SPS
Warranty Claim Code field.
Page 6 July, 2019 Bulletin No.: 17-NA-201
Version 3
Modified February 13, 2019 – Updated the Condition, Cause and Service Procedure.
July 19, 2019 – Added the 2018-2019 Model Years, Breakpoint information and updated
the Involved Region or County, Condition, Cause, Correction and Warranty Information.

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