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Porsche > 997 (911) MK2 2009-2012 > 997 MKII GT3 / GT3 RS 2010-11 > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 17 to 22 (of 22 products)
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Water Hose Supply. Porsche 997.1 Turbo / GT2 / GT3 / 997.2 Turbo / GT3 / GT2 RS - 99710650101
2
Water Hose Supply. Porsche 997.1 Turbo / GT2 / GT3 / 997.2 Turbo / GT3 / GT2 RS
Special Order item
99710650101
Product Information
Product Information
Water Hose Supply. 

The Porsche Water Hose Supply 99710650101 is a genuine replacement coolant supply hose designed for selected Porsche 997 performance models.

Fits:

  • Porsche 997 MK1 TURBO 2007-09
  • Porsche 997 MK1 GT3 / GT3 RS 2007-09
  • Porsche 997 MK1 GT2 2007-09
  • Porsche 997 MKII GT3 / GT3 RS 2010-11
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 997 MKII GT2 RS 2011-13  

Diagram Ref No 9

Located on the right-hand side of the engine cooling circuit, the hose carries coolant from the supply pipe towards the engine, helping maintain continuous coolant circulation and stable operating temperatures.

Manufactured to Porsche specifications, this replacement restores the original hose routing, connections and sealing arrangement when the existing hose has become cracked, hardened, swollen or is leaking.

What This Product Does:
The engine cooling system continuously circulates coolant through the engine, radiators and associated pipework to absorb and dissipate heat.

This supply hose forms part of that circulation path and delivers coolant from the supply pipe into the engine cooling circuit.

Its main functions include:

  • Carrying coolant towards the engine
  • Maintaining continuous coolant circulation
  • Helping maintain correct cooling-system pressure
  • Supporting stable engine operating temperatures
  • Providing a sealed connection between the coolant pipe and engine
  • Helping prevent coolant loss
  • Maintaining the original factory hose routing
  • Supporting effective engine thermal management

The hose itself does not lower coolant temperature, but reliable coolant flow through it is essential for the cooling system to function correctly.

Symptoms Of Wear Or Failure:
Coolant hoses operate under continuous heat and pressure and can deteriorate as they age.

Common symptoms of a worn or failing coolant supply hose include:

  • Visible coolant leakage
  • Dampness around the hose or fittings
  • Dried coolant residue around connection points
  • Cracks or splits in the hose
  • Rubber becoming hard or brittle
  • Swelling or bulging sections
  • Hose becoming excessively soft or spongy
  • Damaged or loose hose connections
  • Low coolant warning
  • Repeated need to top up coolant
  • Sweet coolant smell around the engine bay
  • Engine temperature rising above normal
  • Fluctuating coolant temperature
  • Steam from the engine compartment in severe cases

Cooling-system leaks can also originate from radiators, expansion tanks, water pumps, pipe connections or other hoses, so the complete circuit should be inspected.

Why Replacement Matters:
The cooling system must remain sealed and properly pressurised to control engine temperature effectively.

If the supply hose begins to leak, coolant can escape and the system may gradually lose both fluid and pressure. As the coolant level falls, the engine becomes less able to transfer and dissipate heat.

A deteriorated hose may also split suddenly under operating pressure, causing rapid coolant loss.

Continued operation with insufficient coolant can lead to:

  • Engine overheating
  • Cylinder-head damage
  • Head-gasket damage
  • Damage to seals and cooling-system components
  • Reduced engine reliability
  • Breakdown caused by sudden coolant loss

Replacing a deteriorated hose helps restore:
  • Correct coolant circulation
  • Proper cooling-system pressure
  • A sealed cooling circuit
  • Stable engine temperature
  • Reliable long-term cooling-system operation

Replacing a hose at the first sign of leakage, cracking or swelling can help prevent a relatively minor cooling-system fault from becoming a much more expensive engine repair.



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

99710650101
99710650101

The product you are viewing cross references to these numbers
Water Pipe, Feed. Porsche 997.1 / 997.2 GT3 3.6L / 3.8L / 4.0L MKI / MKII 2007-11 - 99710625290
3
Water Pipe, Feed. Porsche 997.1 / 997.2 GT3 3.6L / 3.8L / 4.0L MKI / MKII 2007-11
Special Order item
99710625290
Product Information
Product Information
Water Pipe, Feed. 

Fits:
Porsche 997.1 GT3 3.6L MKI 2006>>2009
Cars With Engine Codes:
M97.76

Porsche 997.2 GT3 3.8L / 4.0L MKII 2009>>2011
Cars With Engine Codes:
M97.77 / M97.74

Diagram Ref No 3

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

99710625290
99710625290

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110231200, 0PB121228B
3
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
0PB121228B/1::1
Product Information
Product Information
Water tube gasket, cyl 1-3.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 7

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

0PB121228B
9A110231200
0PB121228B

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110231200, 0PB121228B
3
Water tube gasket, Cyl 1-3. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
Special Order item
0PB121228B::1
Product Information
Product Information
Water tube gasket, cyl 1-3.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 7

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

0PB121228B
9A110231200
0PB121228B

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110232200, 0PB121327C
2
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
Special Order item
0PB121327C
Product Information
Product Information
Water tube gasket, cyl 4-6.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 8

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

0PB121327C
9A110232200
0PB121327C

The product you are viewing cross references to these numbers
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2 - 9A110232200, 280.370, 0PB121327C
3
Water tube gasket, Cyl 4-6. Porsche 987.2 Boxster / 987C.2 Cayman / 997.2
0PB121327C/1
Product Information
Product Information
Water tube gasket, cyl 4-6.

Fits:
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Porsche 997 GT3 2014-18

Diagram ref no 8

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

0PB121327C
9A110232200
280.370
0PB121327C

The product you are viewing cross references to these numbers
DISPLAYING 17 to 22 (of 22 products)
1 2
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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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