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Your Vehicle  //  Porsche  //  992 (911) MK2 2024>>  //  992.2 Carrera 2 3.0L 2024>>
Porsche992 (911) MK2 2024>>992.2 Carrera 2 3.0L 2024>>Engine CoolingCoolant Hoses and Pipes (Rear engine cars)Coolant Hoses - Radiator Section

Coolant top hose, RIGHT. Porsche 987 Boxster / 987C Cayman / 997 › 99710662605

Coolant top hose, RIGHT. Porsche 987 Boxster / 987C Cayman / 997 - 99710662605, 99710662604, 99710662603
3
Check vehicle fitment
99710662605/1
Product Information
Product Information
Coolant top return hose, RIGHT
OE Match right-hand coolant top hose / return line for selected Porsche 987 Boxster, Cayman and 997 models. This hose forms part of the engine cooling system and carries coolant through the return side of the cooling circuit.

Fits:
Porsche 987.1 Boxster / S 2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2 Cayman / S 2009 - 2012
Porsche 997 GT3 2007 - 2010
Porsche 997.1 Carrera 2 / 2S 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 2 / 2S 2009 - 2010 CABRIO/COUPE

Diagram ref no 10.

This product supersedes Porsche's old part numbers: 99710662603, 99710662604

This is the right-hand coolant top hose, used as part of the coolant return line within the engine cooling system. It is designed to match the original-style routing and function for the applicable.

What this part does
  • Carries coolant through the return side of the cooling system
  • Forms part of the engine coolant circulation circuit
  • Helps maintain correct coolant flow
  • Supports stable engine operating temperatures
  • Replaces aged, cracked or leaking coolant hoses
  • Suitable for cooling system repair or refurbishment
  • Supplied as an OE Match replacement part

Why Replace This Part?
Coolant hoses are exposed to repeated heat cycles, pressure and engine-bay temperatures. Over time, the hose material can harden, crack, swell or deteriorate. A failing coolant hose can contribute to:
  • Coolant leakage
  • Loss of system pressure
  • Reduced coolant circulation
  • Low coolant levels
  • Engine overheating
  • Coolant residue around hose connections

Replacing deteriorated hoses helps maintain a sealed and reliable cooling system.

When to Replace This Part
  • Hose is leaking coolant
  • Rubber is cracked or hardened
  • Hose is swollen or deteriorated
  • Coolant seepage is visible around connections
  • Cooling system is being overhauled
  • Associated coolant hoses are being renewed

Where it fits on the car
Fits on the right-hand side as part of the coolant return line / upper coolant hose circuit.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99710662605
99710662605
99710662604
99710662603

The product you are viewing cross references to these numbers
Related products
Coolant Hose, Short Feed. Porsche 992.1 / 992.2 Carrera / Turbo / Turbo S / GT3 / RS / ST 2019>> - 99212161, 992121611A, 992121612A
3
Coolant Hose, Short Feed. Porsche 992.1 / 992.2 Carrera / Turbo / Turbo S / GT3 / RS / ST 2019>>
Special Order item
99212161
Product Information
Product Information
Coolant Hose, Short Feed.

Fits:
Porsche 992.1 Carrera MKI 2019>>2024
Porsche 992.2 Carrera MKII 2024>>
Porsche 992.1 Turbo / Turbo S MKI 2020>>
Porsche 992.1 GT3 / RS / ST MKI 2021>>

Diagram Ref No 11

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99212161
99212161
992121611A
992121612A

The product you are viewing cross references to these numbers
Breather Line For Radiator, RIGHT. Porsche 992.1 / 992.2 2019>> - 992121466
4
Breather Line For Radiator, RIGHT. Porsche 992.1 / 992.2 2019>>
Special Order item
992121466
Product Information
Product Information
Breather Line For Radiator, RIGHT.
Maintain proper cooling system ventilation and performance with the Breather Line for Radiator, RIGHT. This OEM-quality breather line is designed to vent trapped air and vapor from the right-side radiator circuit, helping ensure efficient coolant circulation and stable engine temperatures.

Fits:
  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.1 GT3 4.0L / 992 S/T 4.0L 2021-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Targa 4 GTS 3.6L 2024>>  

Diagram Ref No 15

What This Product Does:
  • Releases trapped air from the right-side radiator system
  • Helps prevent air pockets that can restrict coolant flow
  • Supports stable cooling system pressure
  • Maintains consistent engine temperature control
  • Reduces the risk of overheating

Symptoms Of Wear Or Failure:
  • Coolant leaks near the radiator or along the breather line
  • Low coolant warning light
  • Frequent coolant top-offs
  • Sweet coolant smell from the front of the vehicle
  • Coolant residue or staining around fittings or connections
  • Cracked, brittle, or weakened line material
  • Air trapped in the cooling system, causing gurgling sounds
  • Fluctuating engine temperature or inconsistent gauge readings
  • Overheating, especially after coolant service or refilling
  • Steam from under the hood in severe cases

Why Replacement Matters:
  • Replacing a worn radiator breather line is important because it helps the cooling system vent trapped air and maintain proper pressure. Over time, heat and coolant exposure can cause the line to become brittle, cracked, or leak.
  • If the breather line fails, air pockets may form in the radiator circuit, reducing coolant circulation and cooling efficiency. This can lead to coolant loss, unstable engine temperatures, and an increased risk of overheating.
  • Installing a new breather line helps prevent leaks, supports proper system bleeding, and ensures reliable engine cooling performance.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

992121466
992121466

The product you are viewing cross references to these numbers
Breather Line For Radiator, RIGHT. Porsche 992.1 / 992.2 2019>> - 992121466
3
Breather Line For Radiator, RIGHT. Porsche 992.1 / 992.2 2019>>
992121466/1
Product Information
Product Information
Breather Line For Radiator, RIGHT.
Maintain proper cooling system ventilation and performance with the Breather Line for Radiator, RIGHT. This OE MATCH breather line is designed to vent trapped air and vapor from the right-side radiator circuit, helping ensure efficient coolant circulation and stable engine temperatures.

Fits:
  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.1 GT3 4.0L / 992 S/T 4.0L 2021-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Targa 4 GTS 3.6L 2024>>  

Diagram Ref No 15

What This Product Does:
  • Releases trapped air from the right-side radiator system
  • Helps prevent air pockets that can restrict coolant flow
  • Supports stable cooling system pressure
  • Maintains consistent engine temperature control
  • Reduces the risk of overheating

Symptoms Of Wear Or Failure:
  • Coolant leaks near the radiator or along the breather line
  • Low coolant warning light
  • Frequent coolant top-offs
  • Sweet coolant smell from the front of the vehicle
  • Coolant residue or staining around fittings or connections
  • Cracked, brittle, or weakened line material
  • Air trapped in the cooling system, causing gurgling sounds
  • Fluctuating engine temperature or inconsistent gauge readings
  • Overheating, especially after coolant service or refilling
  • Steam from under the hood in severe cases

Why Replacement Matters:
  • Replacing a worn radiator breather line is important because it helps the cooling system vent trapped air and maintain proper pressure. Over time, heat and coolant exposure can cause the line to become brittle, cracked, or leak.
  • If the breather line fails, air pockets may form in the radiator circuit, reducing coolant circulation and cooling efficiency. This can lead to coolant loss, unstable engine temperatures, and an increased risk of overheating.
  • Installing a new breather line helps prevent leaks, supports proper system bleeding, and ensures reliable engine cooling performance.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

992121466
992121466

The product you are viewing cross references to these numbers
Coolant Hose for Centre Radiator. Porsche 992.1 / 992.2 / 992 turbo - 992121629A, 992121630A
4
Coolant Hose for Centre Radiator. Porsche 992.1 / 992.2 / 992 turbo
Special Order item
9921216
Product Information
Product Information

Centre Radiator Coolant Hoses

These coolant hoses are designed for the centre radiator on the Porsche 992 and 992 turbo models. They form part of the high-performance cooling system used in Porsche’s engines, ensuring coolant flows efficiently between the engine and the centre radiator.

Fits:

  • Porsche 992.1 Carrera 2 3.0L 2019-24
  • Porsche 992.1 Carrera 4 3.0L 2019-24
  • Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
  • Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
  • Porsche 992.1 Targa 4 3.0L 2020-24
  • Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
  • Porsche 992.1 Turbo 3.8L 2020-24
  • Porsche 992.1 Turbo S 3.8L 2020-24
  • Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
  • Porsche 992.1 Turbo S Cabriolet 3.8L 2020-24
  • Porsche 992.2 Carrera 2 3.0L 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L 2024>>
  • Porsche 992.2 Carrera 2 3.0L Cabriolet 2024>>
  • Porsche 992.2 Carrera 2 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Carrera 4 GTS 3.6L Cabriolet 2024>>
  • Porsche 992.2 Targa 4 GTS 3.6L 2024>>
  • Porsche 992.2 Turbo 3.6L 2024>>

Diagram Ref No 2 and 3 

High-revving 992 models generate substantial heat, particularly during spirited driving and track use. Proper coolant circulation through the centre radiator helps maintain stable engine temperatures and supports consistent performance under demanding conditions.

What These Coolant Hoses Do

The Porsche 992 cooling system uses multiple radiators mounted at the front of the vehicle to manage engine temperatures. The centre radiator increases the system’s cooling capacity and helps remove excess heat from the coolant.

The hoses perform several important functions:

• Carry coolant to and from the centre radiator
• Maintain proper coolant circulation through the cooling system
• Help regulate engine temperature during high performance driving
• Support efficient heat transfer through the radiator core

Without properly functioning hoses, coolant flow may be restricted, reducing the effectiveness of the cooling system.

Why Coolant Hoses Fail

Cooling hoses operate under extreme conditions and are exposed to heat, pressure and vibration throughout their service life.

Common causes of failure include:

Heat ageing
 Continuous temperature cycles can cause rubber hoses to harden, crack or lose flexibility.

Pressure fatigue
 Cooling systems operate under pressure, which can weaken hoses over time.

Chemical degradation
 Coolant additives and contaminants can gradually break down rubber compounds.

Mechanical wear
 Engine movement and vibration may cause stress or abrasion on hose connections.

Symptoms of Failing Coolant Hoses

• Coolant leaks near the front of the vehicle
• Low coolant level warning messages
• Sweet coolant smell around the front bumper area
• Visible cracking or swelling of the hose
• Engine temperature fluctuations during driving

Replacing worn hoses helps maintain proper coolant flow and prevents sudden coolant loss.

Why You May Need to Replace These Hoses

Maintain Cooling System Efficiency
 Healthy hoses ensure coolant can circulate freely through the centre radiator and engine.

Prevent Coolant Leaks
 Replacing ageing hoses helps maintain the cooling system’s pressure and prevents leaks.

Protect the High-Performance Engine
 These engines operate at high temperatures and require a fully functional cooling system.

Avoid Costly Engine Damage
 Loss of coolant can lead to overheating and significant mechanical damage if not addressed quickly.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9921216
992121629A
992121630A

The product you are viewing cross references to these numbers