Description: All models. 4.8l, 5.3l, 6.0l. With rear ac. All models. 8.1l. With auxiliary ac. Auxiliary A/C. Removes harmful moisture from the A/C refrigerant system This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type