A/C Programmer -J127-

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2018 Volkswagen Tiguan Limited, 2017 Volkswagen Tiguan, 2016 Volkswagen Tiguan, 2015 Volkswagen Tiguan, and 2014 Volkswagen Tiguan. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying A/C Programmer

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

This programmer switches the refrigerant flow direction through the second evaporator if the temperature on the cooling fins on the second evaporator lowers to the freezing point for water (icing protection).