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Why would they not help? You are still under the 36,000 3 year bumper to bumper warranty. Besides the bumper to bumper, there is also a rust warranty for 6 years. I would be talking to the service manager of your dealer or find a different dealer.
This is straight off the chevrolet website.
Bumper-to-Bumper (including tires):
Coverage is for the first 3 years or 36,000 miles, whichever comes first.
Powertrain: Coverage is for the first 5 years or 100,000 miles, whichever comes first.
Sheet Metal:
Corrosion coverage is for the first 3 years or 36,000 miles, whichever comes first.
Rust-through coverage is for the first 6 years or 100,000 miles, whichever comes first.
Sheet Metal
GM vehicles are designed and built to resist corrosion. All body and sheet metal components are warranted against corrosion for 3 years or 36,000 miles, whichever comes first. Plus you’re protected even further from rust-through corrosion for a minimum of 6 years/100,000 miles (whichever comes first). Application of additional rust-inhibiting materials is not required under the corrosion coverage and none is recommended. See your GM dealer for terms of this limited warranty.
http://www.chevrolet.com/owners/warranty.html
If there is any rust on the vehicle at all then it is covered under the corrosion coverage. This is not an issue that is in the hands of the service manager at the dealership, period. I am not sure who you talked to at GM, but you need to find out who your regional GM rep is and contact them and let them know in no uncertain terms that if it is not taken care of then they will be facing action with civil action. They have to honor the warranty and it has nothing to do with the "attitude" of the service manager at teh dealersihp. Dealerships are all different and some just don't want to mess with certain things.
I tell you what, email Louis Henry at the email below and explain to him the trouble you are having and see if he can help. he is a GM Rep.
Direct Email: [email protected]