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Coolant Bottles / Expansion Tanks
By OE Match
- 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
OEMatch Coolant Bottles and Expansion Tanks — Durability, Sealing, Performance
Coolant bottles and expansion tanks store excess coolant and manage pressure as the engine heats and cools, maintaining system volume on Porsche models. Many owners search for genuine or OEM coolant bottles and expansion tanks; these are direct-fit alternatives designed to match the original form, fit and function. Replacing a degraded tank reduces the risk of coolant loss and overheating.
- Replacement plastic reservoirs for standard cooling systems
- Pressurised expansion tanks with integrated sensor mounting
- Pressure caps and remote overflow tanks
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche's original coolant bottles and expansion tanks. OE (Original Equipment) refers to parts matching original specifications for the coolant bottles and expansion tanks and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM coolant bottles and expansion tanks engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. OEMatch supplies a wide range of Porsche parts, from gaskets to suspension hardware, engine items and interior trim. The company has catalogued over 4,000 part numbers and more than 8,700 OE cross-references, and continues to expand its Porsche-focused range.
- Restored coolant capacity and stable system pressure
- Reduced risk of leaks and overheating
- Improved reliability and easier level monitoring
- Plastic fatigue or cracking from thermal cycling
- Leaks at seams, hose connections or caps
- Faulty pressure caps or contamination within the cooling system
A compromised expansion tank can cause rapid coolant loss, pressure instability and overheating, which in turn may lead to engine damage. Timely replacement restores system integrity, helps maintain correct pressure and coolant level, and supports consistent engine operating temperatures on Porsche vehicles.
- Direct replacement options made to original-spec dimensions and tolerances
- Compatible mounting points and sensor interfaces where applicable
- Material choices intended to resist heat, pressure and vibration
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified.
