GM ACDelco RC98 Coolant Tank Cap 01–10 Silverado Sierra LB7 LLY LBZ LMM Duramax

Replace your worn or faulty coolant reservoir cap with this OEM GM ACDelco replacement, designed to restore proper cooling system pressure and prevent leaks, overheating, or drivability issues. This cap fits directly on the surge (radiator) tank and is built to meet GM OE specifications for pressure regulation and durability. Whether you're performing routine cooling system maintenance or replacing a defective aftermarket cap, this part provides a perfect fit and long-lasting performance. Features:- Genuine GM / ACDelco replacement part- Maintains proper cooling system pressure- Prevents coolant leaks and overheating- High-quality construction for long-term durability- Direct fit for OEM surge tank — no modifications needed Fitment Applications:2001–2010 GMC Silverado 2500HD / 3500HD with 6.6L Duramax (LB7, LLY, LBZ, LMM)2001–2010 GMC Sierra 2500HD / 3500HD with 6.6L Duramax (LB7, LLY, LBZ, LMM) Part Numbers:ACDelco Part Number: RC98GM Part Number: 15075118Replaces GM Part Numbers: 150