Reservoir Tank

All. Without 2.8L. 3.1 & 3.8L. Helps maintain optimal engine operating temperatures Designed to store heated coolant when pressures in the system rise and reintroduce it when cooled This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

2.5 & 2.8L, with ac or hd cooling. Gas, ac & hd cool. 6 cylinder, 2.8L, with hd cool or ac. 4 cylinder, with hd cool or ac. All. 6 cylinder 3.1L.