Engine coolant expansion tank kit. Porsche 986 Boxster / 987.1 Boxster 1997-06  ❭  COOLTANKKIT986.1.OE

Engine coolant expansion tank kit.
This kit comes with a genuine coolant expansion tank, matching cap, and multiple bottles of Porsche long-life antifreeze - everything needed to renew your cooling system’s reservoir side with components built to precise Porsche standards.

Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2.7L / 3.2L 2005 - 2006 (9625, 9626)

Diagram ref no 8, 11, 26, 27

This Genuine Porsche kit is designed for Porsche models that use part number 99610614708 for the engine coolant expansion tank, including Porsche Boxster 986 (1997–2004) and Boxster 987 (2005–2008) vehicles. Always verify fitment with your exact model year and chassis before installation.

This engine coolant expansion tank service kit includes the key factory-designed parts used on Porsche vehicles to manage coolant expansion, system pressure, and thermal protection:
• 99610614708 × 1 – Genuine Porsche Coolant Expansion Tank: Factory-original reservoir engineered to hold excess coolant and maintain correct system balance as temperatures change.
•  99610644704 × 1 – Genuine Porsche Expansion Tank Cap: Replacement pressure cap that seals the tank and helps maintain proper cooling system pressure.
•  00004330515 × 5 – Genuine Porsche Long-Life Antifreeze (1 L Red Concentrate, 5-Year Service): Porsche-approved coolant concentrate that, when mixed with distilled water, protects against freezing, boiling and corrosion for up to five years.

Together, these genuine Porsche products deliver a factory-level coolant reservoir solution that restores proper coolant containment and thermal performance.

This kit refreshes the key components of your engine’s coolant expansion side. The expansion tank captures coolant that expands as the engine heats, preventing overflow in the system. The cap keeps the system pressurised for better heat transfer, reducing the risk of boil-over. The included long-life antifreeze provides high-level protection against freezing, overheating, and internal corrosion - vital for engine longevity and reliability

Over time, the factory expansion tank and cap can become brittle, cracked, discoloured, or weakened, which can lead to coolant loss and reduced cooling performance. Using genuine Porsche parts ensures exact fit and factory-level reliability, helping maintain stable engine temperatures and reducing the risk of overheating or internal corrosion. The long-life antifreeze included also extends protection and reduces the frequency of coolant service intervals.

Replace these parts when you notice any of the following conditions:
•  Cracks or visible leaks around the expansion tank
•  Discolouration or brittleness of plastic components
•  Coolant level fluctuations without visible leaks
•  Overheating symptoms or reduced cooling performance
•  Routine coolant system maintenance interval is due

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