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2014-2018 Chevy Silverado's and GMC Sierra's have a problem with cycling of the thermostat that causes stress fractures on the radiator leading to coolant leaks. Attached are GM bulletins on the 2014 and 2015 models. As one can see they have provided special coverage on the 2014 models to 5 years or 100000 miles for this problem.(Bulletin 15829) This is not true of the 2015 like mine although they use similar verbiage in the bulletin P11513A and P11513F. This problem can also exist in 2016-18 models according to what a mechanic told me. It should be noted that Bulletin P11513A and F also applies to 2015 Cadillac Escalade Models, 2015 Chevrolet Suburban, Tahoe, 2015 GMC Sierra Denali, Yukon Models, Yukon Denali Models Equipped with 4.3L, 5.3L or 6.2L Engine (RPOs LV1, LV3, L83 or L86). Anyone regardless of year and mileage with this problem needs to report this to the National Highway Traffic Safety Administration (NHTSA) using the compliant form ( https://www-odi.nhtsa.dot.gov/VehicleComplaint/) or calling the hot line at 1-888-327-4236. With enough complaints the NHTSA may force GM to issue a recall or provide extend coverage. Even if you have had this repaired filling a compliant may get you reimbursed for your costs. Another option is to file a compliant with the Better Business Bureau. They have a compliant form on line just type in BBB Car-Truck Compliant in your search engine. It will not hurt to file a compliant with both the BBB and NHTSA. Although If you are going to do this file with the BBB first as they will not accept your compliant if you file with the NHTSA first. 2015 Radiator PI1513A.pdf 2014 Radiator Special Coverage 15829.pdf GM Bulletin P11513F January 2019.pdf