GMC Sierra Cooling System Gaskets and Seals
Cooling system gaskets and seals for the GMC Sierra span model years 2002–2025, covering the range of sealing components that keep coolant passages, thermostat housings, and water pump connections closed and leak-free. Pick your GMC Sierra's year above to narrow the list to cooling system gaskets and seals with confirmed fitment. Every part shown is checked against our vehicle data.
Cometic C15033 GM Gen-3/4 Small Block V8 Water Pump Backing O-Ring
Cometic C15034 GM Gen III/IV LS Small Block V8 Coolant Bypass O-Ring Seals
What's here for your GMC Sierra
- Engine water pump gaskets
- Engine oil cooler gaskets
- Engine coolant pipe O-rings
- Engine coolant thermostat seals
- Engine coolant outlet gaskets
- Engine coolant thermostat housing gaskets
The widest selection here comes from Victor, Fel-Pro, Cometic, and Dorman, each offering gaskets in a variety of materials and fitment styles to suit the range of GMC Sierra engines across model years. Other categories GMC Sierra owners shop for: GMC Sierra Exterior Lights, GMC Sierra Valve Train Parts and GMC Sierra Springs and Suspension Parts, or browse all GMC Sierra parts and accessories.