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Porsche > 991 (911) MK1 2012-2016 > 991.1 R 4.0L (500 Bhp) 2016 > Engine Cooling >

Coolant Bottles / Expansion Tanks

3 3 3

Coolant / Antifreeze 1Ltr Top-up Bottle - Long Life 5 Year Red For Porsche Cars

00004330515

Product Information

Coolant / Antifreeze 1Ltr Top-up Bottle - Long Life 5 Year Red

Anti Freeze, please check your vehicle handbook for applications

Mix 50/50 with distilled water for best results.

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00004330147

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3 3 3

Coolant Bottle fluid reservoir Porsche 991 2011>>

99110605705/1

Product Information

Water Tank Reservoir.

Fits:
Porsche 991 2011>>

This part number supersedes following numbers:
- 99110615703
- 99110615704

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Coolant bottle level sensor. Porsche Boxster / Cayman / 991 / 970 Panamera

97060650300

Product Information

Coolant bottle level sensor.

porsche

Fits:
Porsche 981 Boxster 2012-16
Porsche 718 (982) Boxster 2017>>
Porsche 981 Cayman 2012-16
Porsche 718 (982) Cayman 2017>>
Porsche 991.1 2012-16
Porsche 991.2 2017>>
Porsche 970 Panamera 2010-16

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Coolant bottle level sensor. Porsche Boxster / Cayman / 991 / 970 Panamera

97060650300/1

Product Information

Coolant Bottle Level Sensor

Restore reliable coolant level monitoring with this OE Match Coolant Bottle Level Sensor. The coolant level sensor monitors the amount of coolant within the expansion tank and allows the vehicle's warning system to alert the driver if the coolant level falls too low.

Fits:

Porsche 981 Boxster 2012-16
Porsche 718 (982) Boxster 2017>>
Porsche 981 Cayman 2012-16
Porsche 718 (982) Cayman 2017>>
Porsche 991.1 2012-16
Porsche 991.2 2017>>
Porsche 970 Panamera 2010-16

Diagram ref no 12

A faulty sensor can cause incorrect low-coolant warnings or may fail to report a genuine drop in coolant level. Replacing a defective sensor restores an important part of the cooling system's monitoring and warning function.

What Does the Coolant Bottle Level Sensor Do?

The coolant level sensor is fitted to the coolant expansion tank, also commonly referred to as the coolant bottle or reservoir.

Its job is to monitor whether the coolant is at the required level. If the level falls below the specified point, the sensor communicates this to the vehicle's electronics so a warning can be displayed to the driver.

A correctly functioning coolant level sensor helps:

Monitor coolant level within the expansion tank
Alert the driver when coolant becomes too low
Provide early warning of coolant loss
Reduce the risk of driving with insufficient coolant
Support correct operation of the cooling system warning functions

The sensor does not measure engine temperature and does not control coolant flow. Its purpose is specifically to monitor coolant level.

Why Is Coolant Level Monitoring Important?

The engine cooling system relies on having the correct quantity of coolant circulating through the engine, radiators and associated components.

A falling coolant level can indicate a leak or another cooling system problem. If coolant loss continues unnoticed, the cooling system may become unable to control engine temperature effectively.

The coolant level sensor therefore provides an important early warning, allowing the cooling system to be inspected before a low coolant condition develops into a more serious problem.

Why Do Coolant Level Sensors Fail?

Coolant level sensors operate in a demanding environment and can deteriorate with age and repeated heating and cooling cycles.

Common causes of failure include:

Age-related electrical deterioration
Repeated temperature cycling
Internal sensor failure
Coolant contamination or deposits
Corrosion at electrical connections
Damaged wiring or connectors
Damage during expansion tank removal or replacement

A problem with the expansion tank, wiring or electrical connector can produce similar symptoms, so these components should also be inspected before replacing the sensor.

When Should the Coolant Level Sensor Be Replaced?

Replacement should be considered if:

A low coolant warning remains on despite the coolant being at the correct level
Low coolant warnings appear intermittently without an actual loss of coolant
The sensor fails diagnostic testing
The sensor or electrical connection is physically damaged
Corrosion is present around the connection
The sensor has been damaged during cooling system maintenance
The coolant expansion tank is being replaced and the existing sensor is no longer serviceable

If the vehicle displays a low coolant warning, the actual coolant level should always be checked first. A warning should not automatically be assumed to be caused by a faulty sensor.

Important Cooling System Checks

If the coolant level is genuinely low, the cause should be investigated rather than simply topping up the expansion tank.

Potential coolant loss can occur from components such as hoses, expansion tanks, radiators, water pumps, seals and other cooling system connections.

Replacing the level sensor is appropriate when the sensor itself has been identified as faulty.

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Coolant bottle rubber holder. Porsche 991 2012>>

99110635701

Product Information

Water tank reservoir rubber holder.

porsche

Fits:
Porsche 991.1 2012-16
Porsche 991.2 2017>>

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Coolant Bottle. Porsche 991 2011>>

99110605705

Product Information

Water Tank Reservoir.

porsche

Fits:
Porsche 991 2011>>

This part number supersedes following numbers:
- 99110615703
- 99110615704

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3 3 3

Filler neck to washer tank gasket. Porsche 991 / Boxster / Cayman / Cayenne

95552871101

Product Information

Filler neck to washer tank gasket

porsche

Fits:
Porsche 991.1 Carrera 2012-16
Porsche 991.2 Carrera / Turbo / GT3 2017>>
Porsche 981 Boxster / S / Spyder 2012-16
Porsche 982 (718) Boxster 2017>>
Porsche 981C Cayman / S / GT4 2012-16
Porsche 981C (718) Cayman 2017>>
Porsche 955 Cayenne 2003-06
Porsche 957 Cayenne 2007-10
Porsche 958 Cayenne 2011-18

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About Coolant Bottles / Expansion Tanks

Coolant Bottles / Expansion Tanks – Reliable Cooling Performance for Porsche Vehicles

Coolant bottles (also known as expansion tanks) are a vital part of your Porsche’s cooling system. They store excess coolant and manage pressure fluctuations as the engine heats up and cools down. By maintaining proper coolant levels and system pressure, they help prevent overheating, engine damage, and coolant loss - ensuring optimal performance and reliability.

At Design911, we offer a complete range of genuine and quality coolant bottles and expansion tanks for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each tank is designed to deliver exact fitment, superior material strength, and long-term resistance to heat and pressure - matching the quality and precision of factory components.

What Do Coolant Bottles / Expansion Tanks Do?

The coolant bottle or expansion tank works as part of a sealed cooling system to:

Store and regulate excess coolant as temperatures and pressure fluctuate.
Maintain consistent pressure to prevent overheating or boiling.
Allow coolant recovery as the system cools, keeping the radiator full.
Provide a visible level indicator to monitor coolant condition and volume.

A properly functioning expansion tank ensures your engine operates at a stable temperature, improving efficiency and extending engine life.

Why Do Coolant Bottles Fail?

Coolant bottles are constantly exposed to heat, vibration, and pressure, which can cause degradation over time. Common causes of failure include:

Plastic fatigue or cracking from thermal cycling.
Coolant leaks around seams, caps, or hose connections.
Discolouration or brittleness from age and coolant exposure.
Faulty pressure caps leading to loss of system pressure.
Corrosion or contamination inside the tank.

Symptoms of a failing coolant bottle include visible coolant leaks, low coolant warnings, overheating, or pressure loss within the cooling system.

Why Replace Faulty Coolant Bottles / Expansion Tanks?

A damaged or leaking expansion tank can quickly lead to overheating, engine damage, or complete cooling system failure. Replacing it ensures safe, efficient operation and protects vital engine components.

Benefits of replacement include:

Restored coolant capacity and pressure stability.
Prevention of leaks and overheating.
Enhanced cooling system reliability and engine protection.
Factory-spec construction with manufacturer-level durability.

All replacement tanks are designed to meet or exceed factory standards using high-grade materials that resist cracking, corrosion, and deformation under extreme conditions

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Coolant Bottles / Expansion Tanks

Coolant cooling system / Reservoir 991 R/GT3/RS 2014-21 105-025

Windscreen washer system 991 R/GT3/RS 2014-21 904-010