Excessive Windshield Condensation, HVAC Defrost Door Flutter Type Noise Heard – 2016-2017 Chevrolet Camaro

Bulletin No.: 17-NA-201
Date: February, 2019


Service Bulletin


TECHNICAL


Subject: Excessive Windshield Condensation, HVAC Defrost Door Flutter Type Noise Heard

Brand: Model: Model Year: VIN: Engine: Transmission:
from to from to
Chevrolet Camaro 2016 2017

 

Involved Region or Country North America and N.A. Export Regions
Condition Some customers may comment on one of the following conditions:

  • Vehicles built between October 15, 2015 – March 12, 2016, a flutter type noise may be heard from the HVAC when in manual mode and set to either floor or tri-level mode.
  • Vehicles built on/after March 13, 2016 may have excessive condensation on the windshield above the center defrost vents.
Cause These may be caused by one of the following conditions:

  • Flutter noise may be due to the HVAC door making contact to the case during high fan speed.

foam pads

 

  • Windshield condensation may be due to 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 extreme 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. Recommended temperature setting is between 68-72 degrees (20-22°C).

table shown above helps to explain the air flow distribution

 

The table shown above helps to explain the air flow distribution.

  • OSA = Outside Air
  • Rec = Recirculated Air
  • F/C = Full Cold
  • F/H = Full Hot
Correction
  • An updated software calibration has been released to address the flutter type noise condition.
  • 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

Flutter Noise:

Reprogram the HVAC system control module with the latest calibrations available on TIS2WEB. Refer to HVAC System Control Module Reprogramming with SPS in SI.

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 NOT connect a battery charger.

 

Windshield Condensation:

Preparation/Tool

  • Boroscope
  • Grippers / Fingers tool 4784132
  • Metal coat hanger / Mechanic wire
  • Zip ties
  • 12” clear tube 5/16” OD x 3/16” ID

Bend the wire 120°, as shown

 

Bend the wire 120°, as shown

 

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.

foam pads

 

  1. Going through the center defrost vents, position the boroscope so the 10 mm x 10 mm foam pads can be seen.

clear tube (recommend 5/16” OD x 3/16” ID)

 

  1. Using the boroscope to view the pad, insert the 12” (30 cm) clear tube (recommend 5/16” OD x 3/16” ID) on top of the foam pad.
  2. With the boroscope and clear tube in place, have an assistant pour approximately 1–2 oz. (30–60 ml) of Kent Acrysol P20005 or equivalent in the clear tube.

Important: DO NOT use more than 1–2 oz. (30–60 ml) 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.

  1. Wait 60 seconds for the foam pads to absorb the Acrysol.
  1. With the boroscope in place, use the grippers/fingers to grab and remove the foam pad.
  2. Remove the grippers/fingers and boroscope.
  3. Repeat steps 3–9 to remove the 2nd foam pad.
  4. 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 75 degrees F (24 C)

  1. Reprogram the HVAC system control module with the latest calibrations available on TIS2WEB. Refer to HVAC System Control Module Reprogramming with SPS in SI.

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 NOT connect a battery charger.

 

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.

 

Version 2
Modified February 13, 2019 – Updated the Condition, Cause and Service Procedure.

Bulletin No.: 17-NA-201
Date: February, 2019

https://www.nhtsa.gov/recalls?nhtsaId=10154646

https://static.nhtsa.gov/odi/tsbs/2019/MC-10154646-9999.pdf

Download (PDF, 825KB)


 

GM Diagnostic/Programming (TIS2Web)

Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.

To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle’s 17 character Vehicle Identification Number (VIN) and select ‘Get CAL ID’.

You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.

The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.

The following are the supported interface tools:

OEM GM Tech 2 Dealer Package
Bosch GM MDI 2 (2nd Gen) MDI2 interface

Bosch EL-52100-AM GM Multiple Diagnostic Interface 2 (MDI 2) Kit

CarDAQ-Plus 2 Diagnostic Code Reader and J2534 Programming Tool

Drew Technologies (DRWCDPLUSKIT) CarDAQ-Plus J2534 Flash Reprogramming Kit
Drew Tech CarDaq-M 2 SAE J2534-1/2 Reflash Reprogramming Tool OEM Diagnostics

Drew Technologies (DRWMONGGM) Mongoose GM Vehicle Interface (VPW/CAN) J2534

 
VSI J2534 ECU Reprogrammer & Diagnostic Adapter
Autel (AULMF2534) MaxiFlash Pro
Dearborn d-Bridge Adapter J2534 OBDII Engineering Tool

The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.

Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle.

The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles. The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.

www.acdelcotds.com

 

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Last update on 2019-04-19 / Affiliate links / Images from Amazon Product Advertising API

Last update on 2019-04-19 / Affiliate links / Images from Amazon Product Advertising API

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