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

Engine Coolant Reservoir

4.3 LITER. 4.8, 5.3, 6.0 & 6.2 LITER. 6.0 LITER. Avalanche, Escalade EXT. Escalade ESV. Silverado, Sierra; w/o Diesel. Tahoe, Yukon, Escalade. Yukon XL, Suburban.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your Chevrolet to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.