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Coolant expansion tank bottle. Porsche 9J1.1 Taycan 2020-24 - 9J1121407A
9J1121407A/1
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
Price: €51.48
In stock
Related products
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
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche Carrera GT 2003-06
Information
Coolant Level Sensor 99764150300 for Porsche 986 / 987 /
996 / 997
Protect your Porsche engine from potentially serious cooling
system issues with this OE Match Coolant Level Sensor. Designed for
Porsche 986 Boxster, 987 Boxster/Cayman, 996 and 997 models, this essential
sensor continuously monitors coolant levels within the expansion tank and
alerts the driver if coolant levels fall below the safe operating range.
Fits:
- 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
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche Carrera GT 2003-06
Diagram ref no 4
As a critical component of the engine cooling system, the coolant level sensor helps prevent overheating and engine damage by providing an early warning before coolant loss becomes a major problem. A faulty sensor can generate false warnings or fail to detect low coolant levels, making replacement an important part of maintaining cooling system reliability.
Manufactured to OE Match specifications, this replacement sensor offers reliable performance, precise fitment and dependable coolant level monitoring.
What Does the Coolant Level Sensor Do?
The coolant level sensor is installed within the coolant expansion tank and monitors the coolant level during vehicle operation.
Its primary functions include:
- Monitoring coolant levels
- Activating low coolant warnings
- Helping prevent engine overheating
- Protecting the engine from coolant loss
- Supporting cooling system diagnostics
- Providing driver alerts
- Improving engine reliability
By detecting coolant loss early, the sensor helps reduce the risk of costly engine damage.
Why Do Coolant Level Sensors Fail?
Coolant level sensors operate continuously in a challenging environment involving heat, pressure and coolant exposure.
Common causes of failure include:
- Age-related electronic wear
- Internal sensor deterioration
- Coolant contamination
- Corrosion of electrical contacts
- Expansion tank deterioration
- Wiring faults
- Heat cycling
- Moisture ingress
Over time, the sensor may lose accuracy or stop functioning altogether.
Symptoms of a Faulty Coolant Level Sensor
Common warning signs include:
- Coolant warning light illuminated
- Intermittent coolant level warnings
- False low coolant alerts
- Warning messages despite correct coolant level
- Cooling system fault codes
- Failure to detect genuine coolant loss
- Dashboard warning messages
In many cases, the sensor may fail before any visible cooling system issues are present.
When Should the Coolant Level Sensor Be Replaced?
Replacement is recommended when:
- False warning messages occur
- Coolant warning lights remain illuminated
- Replacing the coolant expansion tank
- Diagnosing cooling system faults
- Performing preventative maintenance
- Restoring a Porsche 986, 987, 996 or 997
- The original sensor has failed testing
Many specialists replace the sensor during coolant tank replacement as preventative maintenance.
Why Replacement Matters
A properly functioning coolant level sensor provides critical protection for your engine.
Benefits include:
- Accurate coolant level monitoring
- Early warning of coolant loss
- Reduced overheating risk
- Improved engine protection
- Enhanced cooling system reliability
- Prevention of costly repairs
- Improved driver confidence
- Long-term peace of mind
For water-cooled Porsche engines, reliable cooling system monitoring is essential
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99764150300
997-641-503-00
58216
99664150300
99764150300
The product you are viewing cross references to these numbers
Price: €26.40
In stock
Coolant bleed valve. Porsche Boxster 986 / Boxster 987 / Cayman 987C / 996 / 997
Code: 99610634702/1
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
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Information
Replacement bleed valve cap with 8 screws and seal.
This coolant bleed valve cap restore proper sealing and pressure control at the coolant bleed valve on Porsche 996, 997 , Boxster and Cayman models. Its mounts to the coolant distribution housing and provides a secure, leak-free closure for the system's air-bleed point. The cap is supplied complete with 8 mounting screws and the required sealing ring, ensuring a precise fit and reliable installation.
Fits:
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.1C Cayman 2005 - 2008
Diagram ref no: 3, 4, 11, 12
This product supersedes Porsche's old part numbers:
- 99610634700
- 99610634701
Manufactured to match Porsche’s original materials and dimensions, this cap resists heat, coolant exposure, and pressure fluctuations. It maintains correct system sealing during coolant expansion and contraction cycles, helping prevent air pockets, coolant leaks, or pressure loss that can compromise engine cooling performance.
A worn or damaged bleed valve cap can cause:
• Coolant leaks at the bleed housing
• Loss of system pressure, leading to overheating
• Difficulty bleeding the cooling system properly
• Air pockets that reduce coolant circulation and cooling efficiency
Replacing the cap ensures proper cooling-system sealing and prevents costly overheating issues.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610634702
The product you are viewing cross references to these numbers
This coolant bleed valve cap restore proper sealing and pressure control at the coolant bleed valve on Porsche 996, 997 , Boxster and Cayman models. Its mounts to the coolant distribution housing and provides a secure, leak-free closure for the system's air-bleed point. The cap is supplied complete with 8 mounting screws and the required sealing ring, ensuring a precise fit and reliable installation.
Fits:
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.1C Cayman 2005 - 2008
Diagram ref no: 3, 4, 11, 12
This product supersedes Porsche's old part numbers:
- 99610634700
- 99610634701
Manufactured to match Porsche’s original materials and dimensions, this cap resists heat, coolant exposure, and pressure fluctuations. It maintains correct system sealing during coolant expansion and contraction cycles, helping prevent air pockets, coolant leaks, or pressure loss that can compromise engine cooling performance.
A worn or damaged bleed valve cap can cause:
• Coolant leaks at the bleed housing
• Loss of system pressure, leading to overheating
• Difficulty bleeding the cooling system properly
• Air pockets that reduce coolant circulation and cooling efficiency
Replacing the cap ensures proper cooling-system sealing and prevents costly overheating issues.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610634702
99610634702
99610634701
99610634700
The product you are viewing cross references to these numbers
Price: €34.80
In stock
Vehicle Group
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 GT3 MKI 1999-02
Information
Coolant expansion tank bottle.
Also called a coolant reservoir bottle, that’s responsible for collecting excess engine coolant and maintaining proper fluid levels within the cooling system as temperatures change.
Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000
Diagram ref no 1
The expansion tank allows coolant to expand as it heats up and then returns it back to the cooling system once the engine cools, helping maintain correct pressure and fluid volume. It also provides a convenient point for coolant level checks and top-ups when needed.
Function:
• Pressure/regulation: Manages thermal expansion of coolant to prevent overheating or coolant loss.
• Containment: Acts as a buffer to capture overflow and maintain stable coolant levels as the engine cycles through temperature changes.
• Durability: Engineered from heat-resistant materials that withstand prolonged thermal and mechanical stresses.
Over time, factory coolant expansion tanks become brittle and can develop cracks, leaks, or deformation due to heat cycles and coolant chemicals. A compromised reservoir can lead to coolant loss, loss of system pressure, and overheating - which in turn can damage your engine if ignored. Replacing tank restores proper coolant containment and helps preserve engine reliability and longevity.
Replace your coolant expansion tank if you observe any of the following:
• Visible cracks, leaks or coolant seepage around the tank.
• Coolant levels that fluctuate unexpectedly.
• Plastic has become brittle, discoloured, warped or swollen.
• Pressure issues or frequent coolant top-ups are required.
• Any signs of coolant residue or stains around the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
The product you are viewing cross references to these numbers
Also called a coolant reservoir bottle, that’s responsible for collecting excess engine coolant and maintaining proper fluid levels within the cooling system as temperatures change.
Fits:
Porsche 996 C2 / C4 1997 - 2000
Porsche 996 GT3 MKI 1997 - 2000
Diagram ref no 1
The expansion tank allows coolant to expand as it heats up and then returns it back to the cooling system once the engine cools, helping maintain correct pressure and fluid volume. It also provides a convenient point for coolant level checks and top-ups when needed.
Function:
• Pressure/regulation: Manages thermal expansion of coolant to prevent overheating or coolant loss.
• Containment: Acts as a buffer to capture overflow and maintain stable coolant levels as the engine cycles through temperature changes.
• Durability: Engineered from heat-resistant materials that withstand prolonged thermal and mechanical stresses.
Over time, factory coolant expansion tanks become brittle and can develop cracks, leaks, or deformation due to heat cycles and coolant chemicals. A compromised reservoir can lead to coolant loss, loss of system pressure, and overheating - which in turn can damage your engine if ignored. Replacing tank restores proper coolant containment and helps preserve engine reliability and longevity.
Replace your coolant expansion tank if you observe any of the following:
• Visible cracks, leaks or coolant seepage around the tank.
• Coolant levels that fluctuate unexpectedly.
• Plastic has become brittle, discoloured, warped or swollen.
• Pressure issues or frequent coolant top-ups are required.
• Any signs of coolant residue or stains around the engine bay.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614756
99610614753
99610614754
99610614755
99610614756
The product you are viewing cross references to these numbers
Price: €75.00
In stock