Description: 2nd Design. Cavalier, Sunfire. Without turbo. All models. 5.3l. With atc. All models. 6.6l. Hummer H2. 1st Design. Park Avenue. Optional. Restores A/C performance due to restricted orifice tubes 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