Buy OEM 1990 Subaru Part # 45150XC00A. Reserve Tank Radiator. Engine Coolant Expansion Tank A failed expansion tank can cause the cooling system in your 1990 Subaru to

RESERVE TANK ASSEMBLY-RADIATOR Engine Coolant Reservoir

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Engine Coolant Expansion Tank
A failed expansion tank can cause the cooling system in your 1990 Subaru to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.