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Breather line Genuine Porsche part 99610676571

Code: 99610676571

Genuine Porsche part

Breather line

The product code 99610676571 was also found on these diagrams

105-12 - vent line

water cooling - 2 - for 996 CARRERA M339 (all-wheel drive) M96.01/02/03/04 1998-05

105-12 - vent line

water cooling - 2 - for 996 TURBO 2001-05

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

3 3 3

Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL

99610674110/1

Product Information

Coolant Return Water Hose

Maintain the reliability and efficiency of your Porsche's cooling system with this OE Match Coolant Return Water Hose. Manufactured for precise fitment and long-lasting durability, this replacement hose restores the correct circulation of engine coolant between key cooling system components, helping to regulate engine temperature under all driving conditions.

Fits:

Porsche 996 C4 3.4L 1997-08/01

Diagram ref no 3

The cooling system on the Porsche 996 is critical to protecting the M96 engine from excessive heat. The coolant return hose carries coolant back through the system after it has absorbed heat from the engine, allowing it to be cooled by the radiators before recirculating. Over time, the original hose is subjected to constant heat cycles, coolant pressure, vibration and age, causing the rubber to harden, crack or weaken. If left unchecked, this can result in coolant leaks, pressure loss and ultimately engine overheating.

Replacing ageing coolant hoses is an important part of preventative maintenance and is highly recommended during engine repairs, cooling system overhauls or whenever signs of deterioration become evident.

Manufactured to OE Match standards, this coolant return hose provides dependable sealing, excellent durability and factory-quality fitment for long-term reliability.

What Does the Coolant Return Water Hose Do?

The coolant return hose forms part of the engine's closed cooling system, allowing coolant to circulate efficiently between the engine and cooling components.

Its primary functions include:

Returning coolant through the cooling circuit.
Maintaining continuous coolant circulation.
Helping regulate engine operating temperature.
Supporting efficient heat transfer.
Maintaining cooling system pressure.
Preventing coolant loss from deteriorated hoses.

A correctly functioning coolant hose is essential for maintaining engine efficiency and preventing overheating.

Why Replace the Coolant Return Water Hose?

Rubber coolant hoses gradually deteriorate through exposure to heat, pressure and coolant chemicals.

Common reasons for replacement include:

Cracked or perished rubber.
Coolant leaks.
Soft or swollen hose walls.
Internal hose degradation.
Cooling system pressure loss.
Age-related deterioration.
Cooling system refurbishment.
Preventative maintenance.

Replacing worn hoses helps maintain the integrity of the cooling system and significantly reduces the risk of unexpected failures.

Symptoms of a Failing Coolant Hose

A deteriorating coolant return hose may cause:

Visible coolant leaks.
Sweet smell of coolant.
Low coolant warning.
Damp or stained hoses.
Cooling system pressure loss.
Rising engine temperature.
Steam from the engine compartment.
Risk of engine overheating.

Replacing the hose restores reliable coolant circulation and helps protect the engine from heat-related damage.

Benefits

Restores cooling system efficiency.
Helps prevent coolant loss.
Supports stable engine operating temperatures.
Reduces the risk of overheating.
Straightforward direct replacement.
Long-lasting, durable construction.

Whenever replacing coolant hoses, it is advisable to inspect the remaining coolant hoses, hose clips, thermostat, water pump, expansion tank and coolant pipe connections, as these components often age together and replacing them at the same time can help prevent future cooling system failures.

Why Choose OE Match Cooling System Components?

OE Match cooling system components are manufactured to deliver factory-quality fitment, dependable durability and reliable long-term performance. Designed specifically for Porsche applications, they help maintain the efficiency of the cooling system while protecting the engine from overheating. Whether you're repairing a coolant leak, carrying out preventative maintenance or undertaking a complete cooling system overhaul, OE Match components provide the quality expected by Porsche enthusiasts and specialist workshops.

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

99610674110

99610674110

99610674106

99610674104

The product you are viewing cross references to these numbers

Engine coolant hose, Intake. Porsche 996

99610672305/1

Product Information

Engine coolant hose, Intake. RIGHT.
This OE Match engine coolant hose is a replacement intake-side coolant hose for Porsche 996 models. It is designed to match the original-style fitment and function, helping maintain correct coolant flow within the engine cooling system.

Fits:
Porsche 996 Carrera 1998 - 2005
Porsche 996 Turbo 2001 - 2005

Diagram ref no 5

The engine coolant hose carries coolant through the intake-side section of the cooling circuit, helping regulate engine temperature and support efficient heat transfer. A secure, leak-free coolant hose is essential for maintaining the correct operating temperature and protecting the engine from overheating.

Functions
•  Replaces the intake-side engine coolant hose
•  Carries coolant through the engine cooling system
•  Helps maintain correct engine operating temperature
•  Supports coolant circulation and heat transfer
•  Helps prevent coolant leaks and pressure loss
•  Replaces cracked, swollen, split, leaking, or aged original hoses
•  OE Match replacement for cooling system repair and maintenance

Why Replace This Part?
Coolant hoses are exposed to heat, pressure, coolant chemicals, vibration, and age-related wear. Over time, the hose can harden, soften, swell, crack, split, or leak. A failing coolant hose may cause coolant loss, overheating, steam from the engine bay, low coolant warnings, or reduced cooling system reliability. Replacing a worn coolant hose helps protect the engine and restore dependable cooling system performance.

When to Replace This Part
•   The coolant hose is cracked, swollen, soft, brittle, or split
•   Coolant leaks are visible around the hose or connections
•   The engine shows signs of overheating or coolant loss
•   The hose connection is loose or contaminated
•   The cooling system is being serviced or flushed
•   Related coolant pipes, thermostat, water pump, or radiator parts are being replaced
•   Preventative replacement is being carried out during engine maintenance.

Where it fits on the car
This coolant hose fits on the intake-side area of the engine cooling system on Porsche 996 models. It forms part of the coolant circulation circuit and connects according to the factory cooling system layout.

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

99610672305

99610672305

99610672304

99610672302

The product you are viewing cross references to these numbers

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Breather line Genuine Porsche part 99610676571