Description: Vacuum pump. Envision. Equinox, Terrain. 2.0l. Blazer. 2.5l. Malibu. 2.0l. ATS. 2.0l. Traverse. 2.0l. Helps prevent the effects of engine blow-by Assists in minimizing premature oil contamination Operates blower air direction controls for A/C and heat This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors