I drive a 2017 Yukon Denali. Front seats are cooled and heated. Passenger seat vibrates and causes annoying noise. Dealership claims to have heard the noise but is unable to fix or repair. Does anyone have insight and suggestions? If I place my ******* the passenger seat, the vibration and noise stop. Is this problem one of the motivations for GMC to offer ventilated, rather than cooled, seats in the 2018 Yukon Denali?