Shop OEM General Motors Part # 84630072 (84566979). Engine Coolant Reservoir. 6.6 LITER GAS. Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD. Engine Coolant Expansion Tank - Repair or

Tank. Assembly - Radiator Surge. Engine Coolant Reservoir. Expansion. Recovery.
A container that holds Engine Coolant.

Engine Coolant Reservoir

Fits Sierra 2500 HD, Sierra 3500 HD, Silverado

6.6 LITER GAS. Silverado, Sierra 2500 HD. Silverado, Sierra 3500 HD.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.