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- 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
Expansion Tank Coolant Hose
Maintain the reliability of your Porsche's cooling system
with this OE Match Expansion Tank Coolant Hose,
designed specifically for Porsche 997.1 models. Manufactured to OE
specifications, this high-quality replacement hose provides the correct fit,
flexibility and durability required to ensure reliable coolant circulation
between the expansion tank and the cooling system.
Fits:
- 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
Diagram ref no 15
A properly functioning coolant hose is essential for maintaining the correct coolant level, system pressure and engine operating temperature. Replacing ageing or damaged hoses helps prevent coolant leaks, overheating and expensive engine repairs.
What Does the Expansion Tank Coolant Hose Do?
The expansion tank coolant hose connects the coolant
expansion tank to the engine's cooling system, allowing coolant to circulate as
temperatures change during normal operation. It plays several important roles,
including:
- Allowing coolant to flow between the expansion tank and cooling system
- Maintaining correct coolant pressure
- Accommodating coolant expansion and contraction during heating and cooling cycles
- Helping remove trapped air from the cooling system
- Supporting stable engine operating temperatures
Without a properly functioning coolant hose, the cooling system cannot operate efficiently, increasing the risk of coolant loss and overheating.
Why Do Expansion Tank Coolant Hoses Fail?
Coolant hoses are exposed to continuous heat, pressure and
vibration throughout their service life. Over time they naturally deteriorate
due to:
- Heat cycling causing the rubber to harden
- Internal coolant pressure stressing the hose walls
- Age-related cracking and perishing
- Oil or coolant contamination degrading the rubber
- Abrasion from surrounding engine components
- Swelling or softening caused by deteriorating hose materials
As the hose ages it can become brittle, split or begin to leak, compromising the efficiency of the cooling system.
When Should the Expansion Tank Coolant Hose Be Replaced?
The expansion tank coolant hose should be inspected during
every major service and replaced if any of the following symptoms are present:
- Visible coolant leaks
- Cracks or splits in the rubber
- Bulging or soft spots
- Perished or hardened hose material
- Corroded or damaged hose connections
- Coolant residue around the hose or expansion tank.
Many Porsche specialists recommend replacing ageing coolant hoses as preventative maintenance whenever the cooling system is being serviced or when replacing the water pump, thermostat or expansion tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710685101
The product you are viewing cross references to these numbers
- 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
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
The product you are viewing cross references to these numbers
- 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
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
- 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
Coolant expansion (overflow) tank for the Boxster cooling system. It serves as the reservoir for excess coolant from the radiator, allowing coolant to expand when hot and contract when cooled - keeping the system at correct pressure and preventing overflow or coolant loss.
Fits:
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2006
Diagram ref no 7
Replace the coolant expansion tank when you notice coolant leaks, hairline cracks, or white residue forming around the tank seams. If the tank becomes discoloured, brittle, or begins to deform from heat, it can no longer maintain proper pressure. Any signs of coolant smell in the rear trunk area, fluctuating coolant levels, or overheating symptoms also indicate the tank should be replaced.
Why replacement matters:
• Prevents coolant leaks that can cause overheating or engine damage
• Restores proper cooling-system pressure and fluid volume
• Stops air from entering the cooling system, which can lead to hot spots and poor circulation
• Prevents unexpected tank failures caused by old, brittle plastic
• Ensures clean, stable coolant flow for long-term engine reliability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610614708
The product you are viewing cross references to these numbers