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Porsche > 996 (911) (1997-2005) > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 33 to 48 (of 79 products)
<< 2 3 4 5
Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL - 99610674110, 1614300100, 99610674106
2
Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL
Special Order item
99610674110
Product Information
Product Information
Coolant return water hose.

porsche

Fits:
Porsche 996 C4 3.4L 1998-01 MANUAL

This product supersedes Porsche's old part numbers:
- 99610674104
- 99610674106

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

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Related, superseded, cross reference or alternative numbers for comparison.

99610674110
99610674110
1614300100
99610674106

The product you are viewing cross references to these numbers
Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL - 99610674110, 99610674106, 99610674104 - URO-007611
2
Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL
99610674110/1
Product Information
Product Information
Coolant return water hose.

oematch

Fits:
Porsche 996 C4 3.4L 1998-01 MANUAL

This product supersedes Porsche's old part numbers:
- 99610674104
- 99610674106

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

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Related, superseded, cross reference or alternative numbers for comparison.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
Coolant return water hose. Porsche 996 1998-01 3.4L C4 TIPTRONIC - 99610674107, 99610674111
2
Coolant return water hose. Porsche 996 1998-01 3.4L C4 TIPTRONIC
Special Order item
99610674111
Product Information
Product Information
Coolant return water hose.

Fits:
Porsche 996 C4 3.4L 1998-01 TIPTRONIC

This product supersedes Porsche's old part numbers:
- 99610674107

Diagram ref no 3

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Related, superseded, cross reference or alternative numbers for comparison.

99610674111
99610674107
99610674111

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Coolant return water hose. Porsche 996 3.6L C2 MANUAL - 99610684110, 99610684108, 99610684104
4
Coolant return water hose. Porsche 996 3.6L C2 MANUAL
Special Order item
99610684110
Product Information
Product Information
Engine coolant hose, return.

porsche

Fits:
Porsche 996 C2 2002-05
6-Speed Manual Transmission

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

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

99610684110
99610684110
99610684108
99610684104

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Coolant return water hose. Porsche 996 3.6L C2 MANUAL - 99610684110, 99610684108, 99610684104, 1614300400 - URO-004733, 1614300400
2
Coolant return water hose. Porsche 996 3.6L C2 MANUAL
99610684110/1
Product Information
Product Information
Coolant return water hose. Porsche 996 3.6L C2 MANUAL 
From engine return pipe to main return pipe.

Fits:
Porsche 996 C2 2002-05
6-Speed Manual Transmission

Diagram ref no 3

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99610684110
99610684110
99610684108
99610684104
1614300400

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Coolant return water hose. Porsche 996 3.6L C4 AUTO / TIPTRONIC - 99610688809
5
Coolant return water hose. Porsche 996 3.6L C4 AUTO / TIPTRONIC
Special Order item
99610688809
Product Information
Product Information
Coolant return water hose. Porsche 996 3.6L C4 AUTO / TIPTRONIC

porsche

Fits:
Porsche 996 3.6L C4 AUTO / TIPTRONIC

Click 'Zoom in' for large parts diagram.
Diagram ref no. 3



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99610688809
99610688809

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Coolant return water hose. Porsche 996 3.6L C4 MANUAL - 99610688808, 99610688806, 99610688802
2
Coolant return water hose. Porsche 996 3.6L C4 MANUAL
Special Order item
99610688808
Product Information
Product Information
Coolant return water hose. RETURN

porsche

Fits:
Porsche 996 C4 3.6L 2002>> MANUAL

This product supersedes Porsche's old part numbers:
- 99610688802
- 99610688806

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

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99610688808
99610688808
99610688806
99610688802

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Coolant return water hose. Porsche 996 3.6L C4 MANUAL - 99610688808, 99610688806, 99610688802
2
Coolant return water hose. Porsche 996 3.6L C4 MANUAL
99610688808/1
Product Information
Product Information
Coolant return water hose. RETURN

Fits:
Porsche 996 C4 3.6L 2002>> MANUAL

This product supersedes Porsche's old part numbers:
- 99610688802
- 99610688806

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

Related reference numbers
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99610688808
99610688808
99610688806
99610688802

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Coolant supply water hose. Porsche 996 3.4L C4 1998-01 - 99610674003, 99610674004, 99610674006
2
Coolant supply water hose. Porsche 996 3.4L C4 1998-01
Special Order item
99610674006
Product Information
Product Information
Coolant supply water hose.
This Porsche Genuine OE Coolant Supply Water Hose is an original-equipment cooling system hose designed specifically for the Porsche 911 (996) Carrera 4 with the 3.4 L engine. Manufactured to Porsche’s factory specifications, this hose provides the exact fit, material quality, and durability required to maintain reliable coolant circulation within the engine cooling system.

Fits:
Porsche 996 C4 3.4L 1998 - 2001

Diagram ref no 1

This genuine Porsche hose replaces earlier part numbers 99610674003 and 99610674004, ensuring compatibility with the original cooling system design used in early 996 Carrera 4 models.

The coolant supply water hose carries engine coolant between key cooling system components, helping transport hot coolant from the engine to the radiator or distribution pipes where heat is dissipated. By maintaining steady coolant flow, it helps regulate engine temperature and prevents overheating.

A correctly functioning coolant hose ensures the cooling system maintains proper pressure and flow, allowing the engine to operate within its designed temperature range even under high load or spirited driving conditions.

Functions & Technical Role
•  Coolant transfer: Moves coolant between the engine and the main cooling supply pipes
•  Temperature regulation: Supports the cooling system in maintaining optimal engine operating temperature
•  Pressure resistance: Designed to withstand high coolant pressure and temperature cycles
•  Durable construction: Manufactured from heat- and ozone-resistant rubber compounds for long service life
•  OEM precision fit: Exact hose shape and connections to match Porsche’s original cooling layout

Fitment / Position on Car
•  Installed on: Engine cooling system
•  Location: Between the rear coolant supply pipe and the main distribution pipe / radiator supply line
•  Function: Forms part of the primary coolant circulation circuit between engine and cooling components.

Coolant hoses are exposed to constant heat, pressure, and vibration. Over time they can harden, crack, or leak, which may lead to coolant loss and potential engine overheating. Replacing worn hoses with genuine Porsche OE parts ensures the correct material quality, fitment, and durability required to maintain the performance and reliability of the Porsche cooling system.

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

99610674006
99610674003
99610674004
99610674006

The product you are viewing cross references to these numbers
Coolant supply water hose. Porsche 996 C4 3.4L 1998-01 - 99610674003, 99610674004, 99610674006 - 911612-012, URO-004720
2
Coolant supply water hose. Porsche 996 C4 3.4L 1998-01
99610674006/1
Product Information
Product Information
Coolant supply water hose.
This OE Match coolant supply water hose is a direct-fit replacement hose designed for the Porsche 996 Carrera 4 (1998–2001) with the 3.4L engine. Manufactured to match the original Porsche part in shape, material and durability, this hose ensures reliable coolant flow within the engine’s cooling system.

Fits:
Porsche 996 C4 3.4L 1998 - 2001

Diagram ref no 1

This product supersedes Porsche's old part numbers:  99610674003, 99610674004

This coolant supply hose forms part of the engine cooling system in the Porsche 996. It connects key cooling system components and allows coolant to circulate between the engine and cooling circuit, helping maintain the correct operating temperature.

The OE Match hose replicates the original hose design with the correct bends, diameter and reinforced rubber construction to ensure proper fitment and long-term reliability.

The hose carries coolant through the engine cooling circuit, allowing the radiator and thermostat system to regulate engine temperature. Proper coolant circulation prevents overheating and ensures the engine operates within its designed temperature range.

Replacing old or deteriorated hoses helps maintain efficient cooling system performance and prevents coolant leaks that could lead to engine damage.

Function
• Coolant Circulation: Transfers coolant through the engine cooling system
•  Temperature Regulation: Supports stable engine operating temperature
•  Leak Prevention: Reinforced rubber construction ensures secure coolant flow

Coolant hoses are exposed to heat, pressure and coolant chemicals over time, which can cause the rubber to harden, crack or weaken. A failing hose may lead to coolant leaks or sudden rupture, potentially resulting in engine overheating. Replacing ageing hoses ensures reliable coolant circulation and protects the engine from temperature-related damage.

Consider replacing the coolant hose if you notice:
•   Coolant leaks around hose connections
•   Cracked or brittle rubber hose material
•   Swelling or soft spots in the hose
•   During cooling system servicing or preventative maintenance

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

99610674006
99610674003
99610674004
99610674006

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Coolant Vent Hose. Porsche 996 Turbo 2000-05 - 99610633674, 99610633672
2
Coolant Vent Hose. Porsche 996 Turbo 2000-05
Special Order item
99610633674
Product Information
Product Information
Coolant Vent Hose. 

Fits:
Porsche 996 Turbo 2000>>2005

Diagram Ref No 10

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99610633674
99610633674
99610633672

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Cooling system breather hose. Porsche 996 C2 >>2001 - 99610613654, 99610613652, 99610613651
4
Cooling system breather hose. Porsche 996 C2 >>2001
Special Order item
99610613654
Product Information
Product Information
Cooling system breather hose.

porsche

Fits:
Porsche 996 C2 >>2001

Click 'Zoom in' for large parts diagram.
Diagram ref no 12

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99610613654
99610613654
99610613652
99610613651

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Engine coolant hose, Intake. Porsche 996 - 99610672305, 99610672304, 99610672302 - URO-004713
2
Engine coolant hose, Intake. Porsche 996
99610672305/1
Product Information
Product Information
Engine coolant hose, Intake. RIGHT.

oematch

Fits:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 5

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99610672305
99610672305
99610672304
99610672302

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Engine coolant hose, return. Porsche 996 Turbo Tiptronic - 99610674273, 99610674272
4
Engine coolant hose, return. Porsche 996 Turbo Tiptronic
Special Order item
99610674273
Product Information
Product Information
Engine coolant hose, return.

porsche

Fits:
Porsche 996 Turbo 2001-05 Tiptronic transmission

Click 'Zoom in' for large parts diagram.
Diagram ref no 3

Related reference numbers
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99610674273
99610674273
99610674272

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Heater hose - Engine to return line. Porsche 996 / 997 - 99610622275, 99610622274, 99610622265, 99610622266, 99610622257, 99610622256
3
Heater hose - Engine to return line. Porsche 996 / 997
Special Order item
99610622275
Product Information
Product Information
Heater hose - Engine to return line.
Genuine Porsche Original Equipment (OE) heater coolant return hose that connects between the engine cooling circuit and the heater return line, ensuring proper coolant flow through the heater core and back to the engine cooling system.

Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011

Diagram ref no 42

This hose ensures an unobstructed and secure channel for coolant returning from the vehicle’s heater core to the engine cooling loop, playing a vital role in passenger cabin heating and overall engine thermal regulation. Its precise fit and correct routing are essential to avoid bypassing or pinching, which could otherwise lead to heater inefficiency or premature failure.

Installed between the heater core outlet and the engine’s return fitting, this hose:
• Transports heated coolant from the heater core back to the engine cooling system
• Maintains correct flow and pressure balance within the cooling circuit
• Operates under high temperatures and multiple thermal cycles
•  Interfaces with factory-specified clamps and hose connections
Because it is made to OE specification, the hose ensures proper sealing and routing that matches the original Porsche design.

A cooling system hose that has become brittle, cracked, swollen, or porous can leak or restrict flow, leading to reduced heating performance, coolant loss, and potential engine overheating. Because the heater return hose carries pressurised coolant across temperature extremes, degradation over time is typical. Replacing it with a Genuine Porsche OE part ensures correct material performance and sealing, helping preserve cooling efficiency and prevent unexpected failures.

When to replace:
•  Visible cracks, swelling, or soft spots
•  Coolant leaks around the hose ends
•  Heater blowing cold air, indicating poor coolant flow
•  Cooling system overhaul or heater core service
•  Preventive maintenance on high-mile vehicles

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

99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256

The product you are viewing cross references to these numbers
Heater hose - Engine to return line. Porsche 996 / 997 - 99610622275, 99610622274, 99610622265, 99610622266, 99610622257, 99610622256
2
Heater hose - Engine to return line. Porsche 996 / 997
99610622275/1
Product Information
Product Information
Heater hose - Engine to return line.
OE Match heater coolant return hose is a direct-fit replacement designed to replicate the original Porsche hose used in the heater return circuit on Porsche 911 996 and 997 models. It carries coolant from the heater core back into the engine cooling system, supporting both cabin heating and overall thermal regulation.

Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011

Diagram ref no 42

The hose installs directly using original mounting points and standard Porsche hose clamps, making it suitable for both routine maintenance and larger cooling system overhauls.

The heater coolant return hose channels warmed coolant from the heater core back to the engine’s cooling circuit, completing the heater loop. This allows the cooling system to maintain balanced flow and ensures consistent interior heating performance.

Installed between the heater core outlet and the engine return line, this hose:
•  Maintains correct coolant flow and pressure in the heater circuit
•  Supports reliable cabin heating
•  Resists collapse, swelling, and heat degradation
•  Integrates with factory hose routing and connections
 Its OE-matched geometry ensures proper clearance and reduces stress on joints and adjacent hoses.

Over time, heater hoses deteriorate due to heat cycling and coolant exposure. A failing return hose can cause coolant leaks, reduced heating efficiency, air ingress into the cooling system, or engine overheating. Replacing worn hoses with an OE Match component restores proper coolant circulation and helps prevent unexpected cooling system failures.

When to replace:
•  Visible cracks, swelling, or soft spots
•  Coolant leaks around the hose ends
•  Heater blowing cold air, indicating poor coolant flow
•  Cooling system overhaul or heater core service
•  Preventive maintenance on high-mile vehicles

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

99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256

The product you are viewing cross references to these numbers
DISPLAYING 33 to 48 (of 79 products)
<< 2 3 4 5
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About Coolant Hoses - Engine Bay

Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance

Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.

At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.

What Do Engine Bay Coolant Hoses Do?

Coolant hoses form part of your Porsche’s closed-loop cooling system. Their job is to:

  • Circulate coolant between the engine, radiator, and water pump.
  • Maintain engine temperature for optimal performance and emissions.
  • Support consistent coolant pressure during operation.
  • Prevent engine overheating and protect internal components from heat damage.

In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.

Why Do Engine Bay Coolant Hoses Fail?

Over time, coolant hoses endure constant exposure to heat, vibration, and pressure, which can cause wear and eventual failure. Common causes include:

  • Rubber deterioration from heat cycling and coolant chemicals.
  • Cracking or hardening due to age and environmental factors.
  • Swelling or soft spots from internal coolant corrosion.
  • Leaks at connections caused by weakened hose ends or clamps.
  • Abrasion or rubbing against other engine components.

Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.

Why Replace Faulty Coolant Hoses?

A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.

Benefits of replacement include:

  • Restored coolant circulation and temperature control.
  • Prevention of leaks, overheating, and potential engine damage.
  • Improved reliability and performance under all driving conditions.
  • Manufacturer-quality construction and perfect fitment.

All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.

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