I bought a used 2014 Silverado, noticed the coolant smell since I purchased it. I finally found this information about the radiator and TSB 15829. I called GM customer service and was told my VIN was not affected. Took the truck to the dealer I never mentioned the TSB, so I do not know if they are aware of it or not. So after checking it they told me the radiator was leaking where the head meets the tubes like the TSB states, they told me since I was out of the 3/36 it would be $1200 to replace the the just radiator. I called GM customer service back opened a case and demanded that they have someone go out to verify whether my truck has the same issue covered by the TSB. Was told a senior adviser would contact me in 48 hours (still waiting on the call). Within 45 minutes of the call to GM the dealer called me back and stated GM contacted them and told them if I paid a $500 deductible GM would cover the rest.
I thought it was fair half price, but point being if your told your not covered it may be worth it to complain to GM and open a case you may be able to do better. Them making that offer tells me they know the problem affects more vehicles, and lets face it by taking the deal it saves them from reimbursing the $1200 if and when they include other vehicles like mine. Of course i'm sure I forfeit the reimbursement of the $500 by doing this. Oh and by the way mine was made in Mexico.