11-01-39-005A
Service Bulletin Details
Public Details for: 11-01-39-005A
Summary to be provided on a future date.
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File in Section: Service Bulletin 01 - HVAC Bulletin No.: 11-01-39-005A Date: February, 2013 TECHNICAL Subject: Reduced Heater Performance with Winter Grille Cover Installed Models: 2007-2013 Chevrolet Silverado 2500/3500 Series 2007-2013 GMC Sierra 2500/3500 Series Equipped with Duramax™ Diesel Engine (RPO LMM, LML or LGH) Combined with RPOs CJ2 and V10 This bulletin is being revised to add the 2013 model year. Please discard Corporate Bulletin Number 11-01-39-005 (Section 01 – HVAC). Condition Some customers may comment on reduced heater performance or the need to increase the climate control temperature settings when using the winter grille cover (Cover, 1-piece, covers radiator grille for diesel engines in winter weather). Use the following steps to relocate the ambient air temperature sensor into the lower bumper opening using a remote mounting bracket. 1. Remove the radiator air upper baffle/deflector. Refer to Radiator Air Upper Baffle and Deflector Replacement in SI. Cause The winter grille cover restricts airflow, allowing the underhood temperatures to increase. This provides an elevated temperature signal to the HVAC system. This may cause the automatic temperature control to reduce the amount of heat being delivered to the passenger compartment. Correction #1 for Model Year 2011-2013 Vehicles Relocating the ambient air temperature sensor will allow the sensor to continue detecting cooler air. 2736238 2. Carefully remove the ambient air sensor from the radiator support. Copyright 2013 General Motors LLC. All Rights Reserved. Page 2 February, 2013 2736239 3. Remove the wire retainer closest to the sensor. Bulletin No.: 11-01-39-005A 2736243 5. Locate the right vertical support section of the core support lower cross member. 2736241 4. Relocate the sensor and sensor harness in front of the transmission oil cooler as shown. 2736244 6. Mark the center of the vertical support with a paint pen as shown and center punch the mark at the drill location. 7. Drill a 3 mm (1/8 in) hole. Use care to not damage the transmission oil cooler or the radiator. 8. Coat the hole with GM Synthetic Lubricant With Teflon®, P/N 12371287 (in Canada, use 10953437), to prevent corrosion. Bulletin No.: 11-01-39-005A February, 2013 2736245 9. Using a large flange, 1/8 in. shank rivet, such as *Kent Industries part #P57356 or the equivalent, rivet the service bracket to the cross member as shown. Page 3 2736247 • If the sensor is loose in the bracket, install a push tight retainer such as *Kent Industries part #P42999 or the equivalent as shown. 11. Reinstall the radiator air upper baffle/deflector. Refer to Radiator Air Upper Baffle and Deflector Replacement in SI. *We believe this source and their products to be reliable. There may be additional manufacturers of such products/materials. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or material from this firm or for any such items that may be available from other sources. Correction #2 for Model Year 2007-2010 Vehicles 2736246 10. Install the temperature sensor into the bracket as shown. • If the retention fins on the sensor mounting pin were damaged when removing the sensor, the sensor may be loose in the bracket. For vehicles equipped with Automatic Temperature Control HVAC (RPO CJ2), the ambient (outside) air temperature sensor needs to be relocated. Use the following steps to relocate the ambient (outside) air temperature sensor. 1. Remove the radiator grille. Refer to the Radiator Grille Replacement procedure in SI. 2. Remove the ambient air sensor from its current location by carefully lifting the sensor from the radiator support cross bar. 3. Remove the harness clip nearest to the sensor. Page 4 February, 2013 Bulletin No.: 11-01-39-005A Parts Information *Contact Kent Automotive at 1-888-YES-KENT or online at www.kent-automotive.com. Part Number Description 12371287 (in Canada, use 10953437) GM SYNTHETIC LUBRICANT WITH TEFLON® 22743319 BRACKET, AMB AIR TEMP SEN P42999* RETAINER, PUSH-TITE M6 STUD P57356* SUPER-GRIP BLIND RIVET, LARGE FLANGE 1/8 DIA. X 5/16L Warranty Information For vehicles repaired under warranty, use: 2559256 4. Reinstall the ambient air sensor to the new location using the existing hole (1) in the lower section of the radiator support. Labor Operation Description Labor Time D9781* Relocate Ambient (Outside) Air Temperature Sensor 0.6 hr *This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide. 2559257 5. Reinstall the harness clip to the existing hole (2) in the radiator support. 6. Reinstall the radiator grille. Refer to the Radiator Grille Replacement procedure in SI. 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. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION