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DISPLAYING 17 to 31 (of 31 products)
1 2
Best Price
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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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

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99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256

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Best Price
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

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99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256

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Special Order item
99610672706
Product Information
Product Information
Water coolant hose Return. 

porsche

Fits:
Porsche 996 - 1997 to 2005
Porsche 996 turbo - 200 to 2005

Click 'Zoom in' for large parts diagram.
Diagram ref no 10



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99610672706
99610672703
99610672705
99610672706

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99610683204
Product Information
Product Information
Water coolant hose. 

porsche

Fits:
Porsche 996 - 2002 onwards

For engine codes - M96-10, M96-02, M96-04, M96-03

Click 'Zoom in' for large parts diagram.
Diagram ref no 24



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99610683204
99610683204
99610683203

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99610683204/1
Product Information
Product Information
Water coolant hose. 

oematch

Fits:
Porsche 996 - 2002 onwards

For engine codes - M96-10, M96-02, M96-04, M96-03

Click 'Zoom in' for large parts diagram.
Diagram ref no 24



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99610683204
99610683204
99610683203

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Special Order item
99610650256
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Product Information
Water Hose that fits to the Water Pump part number 99610612155.

porsche

Fits:
Porsche 996 C2 / C4 / C4S 1998-05

This product supersedes Porsche's old part numbers:
- 99610650253
- 99610650254

Click 'Zoom in' to see the diagram.
Diagram ref no 24.

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99610650256
99610650253
99610550254
99610550256

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99610650256/1
Product Information
Product Information
Water hose that fits to the water pump part number 99610612155.

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05

This product supersedes Porsche's old part numbers:
- 99610650253
- 99610650254

Click 'Zoom in' to see the diagram.
Diagram ref no 24.

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99610650256
99610650253
99610550254
99610550256

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99610685006
Product Information
Product Information
Water Hose that fits to the Water Pump part number 99610601157.

porsche

Fits:
Porsche 996 C2 / C4 / C4S 2002-05 3.6L

It's recommended to buy pipe 99610685103 along with this part.

This product supersedes Porsche's old part numbers:
- 99610685001
- 99610685005

Click 'Zoom in' to see the diagram.
Diagram ref no 18.

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99610685006
99610685001
99610685002
99610685004
99610685006

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99610622266
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Product Information
Water hose for cars with Tiptronic gearbox

porsche

Fits:
Porsche 996 C2 / C4 / C4S 1998-05 Tiptronic Gearbox

Click 'Zoom in' to see the diagram.
Diagram ref no 33.

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99610622266
99610622265
99610622266
99610622257
99610622256

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99610622266/1
Product Information
Product Information
Water hose for cars with Tiptronic gearbox

oematch

Fits:
Porsche 996 C2 / C4 / C4S 1998-05 Tiptronic Gearbox

Click 'Zoom in' to see the diagram.
Diagram ref no 33.

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99610622266
99610622265
99610622266
99610622257
99610622256

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99610622267
Product Information
Product Information
Water hose. Porsche 996 C2 / C4 3.6L Manual Gearbox

porsche

Fits:
Porsche 996 C2 / C4 3.6L Manual Gearbox

Click "Zoom in" to see the diagram.
Diagram ref no 33.

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99610622267
99610622264
99610622267

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99610623351
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Water Hose.

Fits:
Porsche 996 Carrera 2/4 3.4L 1997>>2001
Porsche 996 Carrera 2/4 3.6L 2001>>2005
Porsche 996 Carrera 4S 3.6L 2001>>2005

Diagram Ref No 29

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99610623351
99610623351

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99610672002
Product Information
Product Information
Water return pipe, Right.

porsche

Fits:
Porsche 996 C4 / C4S 1997-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 8

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99610672002
99610672002

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99610624255
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Product Information
Water tube, feed. 
M 66X 01815

porsche

Fits:
Porsche 996 Carrera 3.4L / 3.6L 2001>>
6-speed manual transmission 

Click 'Zoom in' for large parts diagram.
Diagram ref no 26

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99610624255
99610624255
99610624253

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DISPLAYING 17 to 31 (of 31 products)
1 2
Also found on these pages
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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