Hi, I have an 07 Tahoe with 49K on it. I just took it for it's longest trip, about 7 hours. 5+ hours into it we started to notice a strong odor from time to time. At the next rest stop I couldn't believe how strong it was. Smelled like burnt 90W to me. I checked all the fluids and all were OK. I got underneath and noticed a leak in my tranny pan and a front axle seal but they weren't to blame. Source of the smell was definitely in the rear. The smell remained for the entire rest of the trip. Made an appointment as soon as I got home for the smell, tranny and front seal. The dealer fixed the tranny and seal (2days) but TRIED to tell me the smell was normal venting and it was OK. I COULDN'T DISAGREE MORE!!!! I've had two Silverado's and an Avalanche and NONE have ever don this. The ODOR is not normal. 90W is bad enough... try cooking it also.
I did some searches and found the bulletin below. The dealer says it not real.
My question is.. Has anyone had this problem and can anybody authenticate this bulletin. HELP!!!!
ZX1100F1
06-21-2007, 03:49 PM
Document ID# 1888812
2007 Chevrolet Tahoe - 4WD
Subject: Propane Sulfur Or Foul Odor From The Rear Differential - keywords axle fluid vent #PIP4027 - (01/18/2007) Models: 2007 Cadillac Escalade, Escalade ESV, Escalade EXT
2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 GMC Sierra, Yukon, Yukon XL
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Odor or repeat odor from the rear differential with no other noise symptoms. Recommendation/Instructions: Drain and disassemble the rear differential by removing the gear case and axle shafts. Clean the rear differential completely with a suitable solvent make sure the housing is clean and dry prior to reassembly. Replace the rear differential vent hose and cap. Relocate the vent to either near the spare tire or evap canister area. Cut the new vent hose approximately 6 inches from the vent cap end and install filter part number 5651682, secure the filter with clamps supplied. Fill the differential with the appropriate fluid listed in eSI Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. 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.
© Copyright General Motors Corporation. All Rights Reserved.
I did some searches and found the bulletin below. The dealer says it not real.
My question is.. Has anyone had this problem and can anybody authenticate this bulletin. HELP!!!!
ZX1100F1
06-21-2007, 03:49 PM
Document ID# 1888812
2007 Chevrolet Tahoe - 4WD
Subject: Propane Sulfur Or Foul Odor From The Rear Differential - keywords axle fluid vent #PIP4027 - (01/18/2007) Models: 2007 Cadillac Escalade, Escalade ESV, Escalade EXT
2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 GMC Sierra, Yukon, Yukon XL
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: Odor or repeat odor from the rear differential with no other noise symptoms. Recommendation/Instructions: Drain and disassemble the rear differential by removing the gear case and axle shafts. Clean the rear differential completely with a suitable solvent make sure the housing is clean and dry prior to reassembly. Replace the rear differential vent hose and cap. Relocate the vent to either near the spare tire or evap canister area. Cut the new vent hose approximately 6 inches from the vent cap end and install filter part number 5651682, secure the filter with clamps supplied. Fill the differential with the appropriate fluid listed in eSI Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. 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.
© Copyright General Motors Corporation. All Rights Reserved.
