Coolant bottle level sensor. Porsche Boxster 986 / Boxster 987 / 996 / 997  ❭  99764150300

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

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