Genuine GM Coolant Outlet O-Ring 12584040 – Suits GM/Holden V6/V8 & many 3.6L platforms

Genuine GM Coolant Outlet O-Ring 12584040 is the factory seal used between the coolant outlet housing and the engine block or timing cover on GM 3.6L Alloytec and SIDI V6 engines. This O-ring ensures a leak-free seal, maintaining proper coolant flow and system pressure within the engine cooling system.

When servicing the water outlet housing, or replacing gaskets in the cooling circuit, this Genuine GM seal is an essential part to prevent coolant seepage and maintain system integrity.

Fitment:

• Holden Commodore VE / VF (3.6L Alloytec & SIDI V6)
• Holden Calais VE / VF (3.6L Alloytec & SIDI V6)
• Holden Caprice WM / WN (3.6L Alloytec & SIDI V6)
• Holden Statesman WM (3.6L Alloytec V6)
• Holden Captiva (3.6L Alloytec / SIDI V6 – LE0, LY7, LLT, LFX)

Specifications:

• OEM Part Number: 12584040
• Application: Coolant outlet housing O-ring seal
• Material: High-temperature coolant-resistant rubber
• Function: Seals coolant outlet to prevent leaks and pressure loss
• Engine Family: GM 3.6L Alloytec / SIDI V6 (LE0, LY7, LLT, LFX)

Key Features:

• Genuine GM OEM component for perfect fit and reliability
• Prevents coolant leaks around outlet housing and timing cover
• Resistant to pressure, heat, and long-term coolant exposure
• Essential replacement during cooling system service or rebuild
• Direct-fit replacement – no modification required

Installation Tip: Clean the housing and block surfaces before installation. Lightly lubricate the new O-ring with fresh coolant to ensure even seating and prevent pinching during assembly.