Coolant Bottles / Expansion Tanks

Engine coolant expansion tank kit with sensor.
This is a comprehensive OE Match-quality service kit designed to refresh and restore the engine coolant expansion system for Porsche vehicles. It includes the expansion tank, pressure cap, long-life antifreeze, and a coolant level sensor - giving you all major components needed for a proper coolant system service. 

Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000

Diagram ref no 1, 2, 3, 4, 5, 9, 11, 12.

This engine coolant expansion tank kit brings together all the essential components that ensure your Porsche’s coolant system works efficiently and reliably:

• 1x 99610614756/1 –  OE Match Coolant Expansion Tank Bottle: A high-quality OE Match reservoir that captures overflow and maintains appropriate coolant volume.

• 1x 99610644704/1 – OE Match Expansion Tank Cap: Maintains correct cooling system pressure to optimize thermal performance.

• 5x 00004330194 – Comma 1 L Antifreeze Concentrate (Red, 5-Year): Long-life coolant concentrate to mix with distilled water, offering corrosion protection and thermal stability.

• 1x 99764150300/1 – OE Match Coolant Level Sensor: Monitors coolant level inside the expansion tank and alerts the driver if the level drops too low.

Together, these items create a complete cooling system refill and monitoring kit.

This kit refurbishes the coolant expansion side of the cooling system. The expansion tank stores excess coolant when the engine heats up and returns it as it cools. The pressure cap ensures the system operates at the correct pressure, which increases coolant boiling point and improves efficiency. The included coolant provides balanced antifreeze protection and corrosion resistance for years, while the sensor keeps track of coolant level and triggers warnings if levels fall below safe thresholds.

Over time, plastic coolant expansion tanks can become brittle, cracked, or distorted, leading to leaks and loss of coolant. A weak pressure cap can fail to maintain proper system pressure, reducing cooling effectiveness. Old coolant can lose its protective qualities, leading to corrosion and overheating. Without a functioning coolant level sensor, you may not be alerted to low coolant levels, increasing risk of engine overheating or damage. This kit replaces all of these important parts at once, restoring correct operation and helping ensure the engine stays well-protected.

Replace any of these components if you observe the following:
•   Cracks, leaks, or deformation in the expansion tank.
•   A non-sealing or failing pressure cap.
•   Coolant looks discoloured, sludgy, or contaminated.
•   Dashboard warning light for coolant level.
•   Regular service interval for coolant change is due.
•   Unexplained engine temperature fluctuations.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT996.2

The product you are viewing cross references to these numbers

Engine coolant expansion tank kit with sensor.
A complete Genuine Porsche coolant expansion system service kit designed to replace key cooling system components including expansion tank, pressure cap, long-life Porsche coolant concentrate, and a coolant level sensor.

Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000

Diagram ref no 1, 2, 3, 4, 5, 9, 11, 12.

This is a Genuine Porsche parts kit comprising essential cooling system components for vehicles that use 99610614756 as the engine coolant expansion tank. Genuine parts ensure exact fit and preserved factory-engineered performance and durability.

Kit Includes:
• 99610614756 × 1 – Genuine Porsche Engine Coolant Expansion Tank: Factory reservoir that manages coolant overflow as temperatures change.
• 99610644704 × 1 – Genuine Porsche Expansion Tank Cap: Maintains correct cooling system pressure and seals the reservoir effectively.
• 00004330515 × 5 – Genuine Porsche Antifreeze/Coolant (1 L Bottles, Red, Long-Life): Porsche-approved coolant concentrate that delivers thermal protection and corrosion resistance when mixed correctly with distilled water.
• 99764150300/1 × 1 – Genuine Porsche Coolant Level Sensor: Factory-specified sensor that monitors coolant level inside the expansion tank and alerts the driver of low coolant.

Together, these parts refresh or restore the cooling system’s expansion reservoir side, ensuring proper coolant containment, pressure control, and system monitoring.

Over time, factory expansion tanks and caps can brittle, crack, or lose sealing integrity due to heat cycling and coolant chemistry, leading to leaks, pressure loss, and potential engine overheating. Old coolant may also degrade, losing its protective properties. The coolant level sensor may fail or give false readings if worn. Replacing all of these with Genuine Porsche components ensures continued cooling system integrity, accurate level monitoring, and reliable performance over time.

Replace components in this kit when you observe any of the following:
•  Cracks, distortion, or coolant leaks around the tank
•  Expansion tank cap no longer seals or holds pressure
•  Coolant appears contaminated, discoloured, or degraded
•  Dashboard warning of low coolant level
•  Routine service interval for coolant system maintenance

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT996.2.OE

The product you are viewing cross references to these numbers

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 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000

Diagram ref no 1, 3, 4, 5, 9, 11, 12.

This comprehensive kit includes the essential parts needed when servicing or replacing the coolant expansion system on Porsche models that use part number 99610614756. An OE Match expansion tank provides a direct fit and correct performance:

• 1x 99610614756/1 – OE Match Coolant expansion tank - for correct fit & durability.

• 1x 99610644704/1 – OE Match Coolant expansion tank pressure cap - to hold system pressure and prevent boiling/overflow.

• 5x 00004330194  – Comma Concentrated Long-Life Red Antifreeze / Coolant - for optimal cooling & corrosion protection.

This kit refreshes the entire coolant expansion side of the cooling system. The expansion tank collects excess coolant and allows it to return to the system as temperatures change. The pressure cap controls system pressure, raising coolant boiling point and preventing air ingress. The antifreeze bottles supply corrosion protection, freezing/boiling point stability, and long-term fluid protection when mixed and filled.

A worn or failing expansion tank can crack, leak or lose pressure, leading to coolant loss, overheating, and potential engine damage over time. The pressure cap also plays a critical role: an old or weak cap can fail to hold sufficient system pressure, lowering coolant boiling point and reducing cooling efficiency. Fresh antifreeze not only prevents freezing/boiling extremes but also protects metal parts from corrosion, improving overall engine health and heat management.

Replace components when you notice any of the following:
•  Coolant reservoir shows cracks, swelling, brittleness or leaks.
•  Coolant fluid levels change unexpectedly without visible leaks.
•  Pressure cap no longer maintains correct system pressure.
•  Coolant appears contaminated, sludgy, or discoloured.
•  Recommended coolant change interval (e.g., every 2–5 years) is due.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT996.1

The product you are viewing cross references to these numbers

Engine coolant expansion tank kit.
This kit includes the expansion tank reservoir, pressure cap, and multiple bottles of genuine Porsche coolant/antifreeze - everything needed for a full coolant system refresh

Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000

Diagram ref no 1, 3, 4, 5, 9, 11, 12.

This kit is suitable for Porsche models that use part 99610614756 as the coolant expansion tank reservoir.

Kit Includes:
• 99610614756 × 1 - Genuine Porsche Coolant Expansion Tank Bottle: Factory-spec reservoir engineered to handle coolant expansion and contraction as engine temperatures fluctuate.
•  99610644704 × 1 - Genuine Porsche Expansion Tank Cap: Provides reliable system pressure control in the cooling system to maintain boiling point and prevent coolant loss.
•  00004330515 × 5 - Genuine Porsche Antifreeze Coolant 1 Litre (Red, Long Life, 5-Year Protection): High-quality coolant concentrate designed to be mixed 50/50 with distilled water for excellent heat transfer, freeze/boil protection, and corrosion resistance.

This kit restores key components of the engine’s coolant reservoir system. The expansion tank collects and stores excess coolant as it expands during heating, the pressure cap maintains proper system pressure to raise the coolant’s boiling point, and the antifreeze delivers long-lasting thermal protection and corrosion control. Using genuine Porsche coolant ensures fluid chemistry is matched to factory specifications.

With age and heat cycling, the original expansion tank and cap can become brittle, cracked, or unable to maintain proper pressure, leading to coolant loss, air ingress, and potential overheating issues. Using genuine Porsche coolant ensures the fluid meets manufacturer chemistry standards for corrosion protection and performance. Replacing these components with genuine parts helps restore the cooling system’s integrity and protects the engine from thermal stress and premature wear.

Replace these components if you notice any of the following:
•  Visible cracks, leaks, or discoloration on the expansion tank
•  Pressure cap that no longer seals properly
•  Coolant that looks contaminated or past its service life
•  Unexplained coolant loss or coolant level fluctuations
•  Scheduled cooling system maintenance interval reached

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

COOLTANKKIT996.1.OE

The product you are viewing cross references to these numbers