Buy OEM 1990 Subaru Part # 745153150 (745153140). Cap Radiator. Cap Reserve Tank. Engine Coolant Expansion Tank A failed expansion tank can cause the cooling system in your 1990 Subaru

Radiator Cap.

CAP-RESERVE TANK CAP ASSEMBLY-RADIATOR Radiator Cap

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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.