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Engine coolant expansion tank kit. Porsche 986 Boxster / 987.1 Boxster 1997-06 - COOLTANKKIT986.1
COOLTANKKIT986.1
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Information
Engine coolant expansion tank kit.
The kit combines a coolant expansion tank, a pressure cap, and long-life antifreeze concentrate to deliver a complete coolant system refresh.
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 OE Match kit is engineered for Porsche vehicles that utilise 99610614708 style expansion tanks - most commonly fitting Porsche Boxster 986 (1997-2004) and 987 (2005-2006) models. Always verify fitment with your specific year, engine and chassis before ordering.
The engine coolant expansion tank kit includes:
• 99610614708/1 × 1 – OE Match Coolant Expansion Tank: Precisely manufactured replacement reservoir designed to match the original Porsche part used on Boxster models. It collects excess coolant as it expands under heat and releases it back into the system as it cools down.
• 99610644704/1 × 1 – OE Match Expansion Tank Cap: A direct-fit cap that seals the coolant reservoir and helps maintain proper pressure in the cooling system, aiding heat control and preventing coolant loss.
• 00004330194 × 5 – Comma Antifreeze Coolant (1 L Red, 5-Year Concentrate): Premium antifreeze concentrated coolant that, when mixed correctly with water, delivers long-lasting protection against freezing, boiling, and corrosion.
This kit brings together all the primary components you need when servicing or refreshing the coolant expansion side of your engine’s cooling system.
The expansion tank accepts expanding coolant from the radiator and engine as temperatures rise, storing it safely and helping maintain correct coolant levels. The cap seals the system and maintains the right amount of pressure, allowing the cooling system to function efficiently. The antifreeze provided offers long-term protection against corrosion, freezing and overheating - crucial to preserving engine health and reducing wear.
Over time, the original plastic tank can become brittle or crack due to heat cycling and age, which may lead to leaks, coolant loss, or air infiltration that disrupts coolant circulation. A failing pressure cap can no longer maintain correct system pressure, reducing cooling efficiency. Replacing these components with OE Match parts helps restore reliable coolant containment and pressure stability - helping prevent costly overheating and engine damage.
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
COOLTANKKIT986.1
The product you are viewing cross references to these numbers
The kit combines a coolant expansion tank, a pressure cap, and long-life antifreeze concentrate to deliver a complete coolant system refresh.
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 OE Match kit is engineered for Porsche vehicles that utilise 99610614708 style expansion tanks - most commonly fitting Porsche Boxster 986 (1997-2004) and 987 (2005-2006) models. Always verify fitment with your specific year, engine and chassis before ordering.
The engine coolant expansion tank kit includes:
• 99610614708/1 × 1 – OE Match Coolant Expansion Tank: Precisely manufactured replacement reservoir designed to match the original Porsche part used on Boxster models. It collects excess coolant as it expands under heat and releases it back into the system as it cools down.
• 99610644704/1 × 1 – OE Match Expansion Tank Cap: A direct-fit cap that seals the coolant reservoir and helps maintain proper pressure in the cooling system, aiding heat control and preventing coolant loss.
• 00004330194 × 5 – Comma Antifreeze Coolant (1 L Red, 5-Year Concentrate): Premium antifreeze concentrated coolant that, when mixed correctly with water, delivers long-lasting protection against freezing, boiling, and corrosion.
This kit brings together all the primary components you need when servicing or refreshing the coolant expansion side of your engine’s cooling system.
The expansion tank accepts expanding coolant from the radiator and engine as temperatures rise, storing it safely and helping maintain correct coolant levels. The cap seals the system and maintains the right amount of pressure, allowing the cooling system to function efficiently. The antifreeze provided offers long-term protection against corrosion, freezing and overheating - crucial to preserving engine health and reducing wear.
Over time, the original plastic tank can become brittle or crack due to heat cycling and age, which may lead to leaks, coolant loss, or air infiltration that disrupts coolant circulation. A failing pressure cap can no longer maintain correct system pressure, reducing cooling efficiency. Replacing these components with OE Match parts helps restore reliable coolant containment and pressure stability - helping prevent costly overheating and engine damage.
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
COOLTANKKIT986.1
99610614708
99610614703
99610614704
99610614705
99610614706
99610614707
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
1 x Coolant bottle. Porsche Boxster 986 / Boxster 987 1997-06 (99610614708/1
1 x Coolant reservoir / expansion tank cap. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 996 / 997 (99610644704/1
5 x Antifreeze 1Ltr Concentrate Bottle 5 year Red (00004330194
€209.35
Now €193.20
In stock
Related products
Vehicle Group
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
Information
Coolant expansion tank bottle.
This genuine coolant expansion tank is the original-spec reservoir that forms part of the Taycan’s coolant system, responsible for managing coolant volume and pressure as the system heats and cools. Manufactured by Porsche to strict OEM standards.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts excess coolant as it expands under heat, preventing over-pressure in the cooling system.
• Allows coolant to return to the system when temperatures drop, helping maintain proper coolant volume and pressure.
• Provides a clean, secure housing that resists heat, pressure, and coolant chemistry - preventing leaks and degradation.
• Maintains correct coolant level and system integrity, vital for thermal management of batteries, motors, and inverter cooling.
When to replace. You should consider replacing the coolant expansion tank if:
• The original shows cracks, discoloration, deformation, or leaks.
• Coolant level drops unexpectedly without visible external leak - indicating internal crack or cap failure.
• The tank becomes brittle, warped, or chemically aged due to coolant exposure and heat cycles.
• You are restoring or servicing the cooling system, or performing maintenance/replacement of hoses, pumps or thermal components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
The product you are viewing cross references to these numbers
This genuine coolant expansion tank is the original-spec reservoir that forms part of the Taycan’s coolant system, responsible for managing coolant volume and pressure as the system heats and cools. Manufactured by Porsche to strict OEM standards.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts excess coolant as it expands under heat, preventing over-pressure in the cooling system.
• Allows coolant to return to the system when temperatures drop, helping maintain proper coolant volume and pressure.
• Provides a clean, secure housing that resists heat, pressure, and coolant chemistry - preventing leaks and degradation.
• Maintains correct coolant level and system integrity, vital for thermal management of batteries, motors, and inverter cooling.
When to replace. You should consider replacing the coolant expansion tank if:
• The original shows cracks, discoloration, deformation, or leaks.
• Coolant level drops unexpectedly without visible external leak - indicating internal crack or cap failure.
• The tank becomes brittle, warped, or chemically aged due to coolant exposure and heat cycles.
• You are restoring or servicing the cooling system, or performing maintenance/replacement of hoses, pumps or thermal components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
9J1121407A
The product you are viewing cross references to these numbers
Price: €117.30
Orderable
Vehicle Group
- Porsche 9J1.1 Taycan 2020-24
- Porsche 9J1.1 Taycan Sport Turismo 2020-24
- Porsche 9J1.1 Taycan 4 Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S 2020-24
- Porsche 9J1.1 Taycan 4S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan 4S Sport Turismo 2020-24
- Porsche 9J1.1 Taycan GTS 2020-24
- Porsche 9J1.1 Taycan GTS Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo 2020-24
- Porsche 9J1.1 Taycan Turbo Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo Sport Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S 2020-24
- Porsche 9J1.1 Taycan Turbo S Cross Turismo 2020-24
- Porsche 9J1.1 Taycan Turbo S Sport Turismo 2020-24
Information
Coolant expansion tank bottle.
OE Match coolant expansion (overflow) tank that forms part of the Taycan’s closed cooling system. It serves as a buffer reservoir for coolant volume changes caused by temperature fluctuations in the system. It also provides a visible coolant level reference and a fill point for maintenance. As a direct-fit replacement, it integrates with the factory hoses, clamps, and sensors without modification.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts expanding coolant when temperature rises, preventing over-pressure in the cooling circuit.
• Stores slightly extra coolant, which returns to the main system when temperatures drop - maintaining consistent coolant levels.
• Provides a safe, sealed reservoir that resists coolant chemistry, temperature, and vibration - preventing leaks or contamination.
• Offers a sight-glass or translucent body (or level markings), making coolant level checks simple and straightforward for maintenance.
Over time, coolant expansion tanks may develop cracks, stress fractures or leaks due to pressure cycling, temperature variation, or material fatigue - particularly in high-performance or electric cooling systems. If the expansion tank fails, you risk coolant leaks, pressure loss, overheating or inadequate coolant circulation.
An OE Match replacement restores proper system pressure management, coolant containment, and leak-free operation. It protects the drivetrain’s thermal management integrity, supports battery/motor cooling stability, and helps prevent costly damage or component failure.
When to Replace Consider replacing the expansion tank if:
• The original shows visible cracks, deformation, or plastic fatigue.
• There is coolant loss or leakage under the car or around the reservoir.
• The system shows erratic coolant-level changes or pressure anomalies.
• You are performing cooling-system maintenance, overhaul, or upgrades.
• You notice discoloration, brittleness, or internal contamination in the tank material.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
The product you are viewing cross references to these numbers
OE Match coolant expansion (overflow) tank that forms part of the Taycan’s closed cooling system. It serves as a buffer reservoir for coolant volume changes caused by temperature fluctuations in the system. It also provides a visible coolant level reference and a fill point for maintenance. As a direct-fit replacement, it integrates with the factory hoses, clamps, and sensors without modification.
Fits:
Porsche 9J1.1 Taycan 2020 - 2024
Diagram ref no 1
The coolant expansion/overflow reservoir for the Taycan’s coolant system. It collects and stores excess coolant from the closed-loop cooling circuit when temperature changes cause expansion. It also provides a visible coolant level reference and a refill point when topping-up is required.
This coolant tank:
• Accepts expanding coolant when temperature rises, preventing over-pressure in the cooling circuit.
• Stores slightly extra coolant, which returns to the main system when temperatures drop - maintaining consistent coolant levels.
• Provides a safe, sealed reservoir that resists coolant chemistry, temperature, and vibration - preventing leaks or contamination.
• Offers a sight-glass or translucent body (or level markings), making coolant level checks simple and straightforward for maintenance.
Over time, coolant expansion tanks may develop cracks, stress fractures or leaks due to pressure cycling, temperature variation, or material fatigue - particularly in high-performance or electric cooling systems. If the expansion tank fails, you risk coolant leaks, pressure loss, overheating or inadequate coolant circulation.
An OE Match replacement restores proper system pressure management, coolant containment, and leak-free operation. It protects the drivetrain’s thermal management integrity, supports battery/motor cooling stability, and helps prevent costly damage or component failure.
When to Replace Consider replacing the expansion tank if:
• The original shows visible cracks, deformation, or plastic fatigue.
• There is coolant loss or leakage under the car or around the reservoir.
• The system shows erratic coolant-level changes or pressure anomalies.
• You are performing cooling-system maintenance, overhaul, or upgrades.
• You notice discoloration, brittleness, or internal contamination in the tank material.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9J1121407A
9J1121407A
The product you are viewing cross references to these numbers
€99.45
Now €89.50
In stock