TSB: REVISION NOTICE August 23, 2017 Rev1: ? Applicability has been updated to include 2015 model year xB vehicles, 2015 ? 2016 model year tC vehicles, and 2016 model year iM vehicles. ? The Parts Information section has been updated. Any previous printed versions of this bulletin should be discarded. Introduction. Some vehicles in particular geographic areas may exhibit a condition where the HVAC Evaporator Drain Hose has become obstructed with an insect nest. An insect repellent drain hose tip (ARINIX® Tip) is now available to help minimize future occurrences of this environmental condition. For some models, a new drain hose is required to properly fit the ARINIX® Tip.