Coolant Supply Hose. Porsche 997 Turbo / GT2 / GT3 / GT3 RS / GT2 RS M97.70 / M97.76 2007–11  ›  99710647772

Coolant Supply Hose.

The Genuine Porsche Coolant Supply Hose 99710647772 is an original equipment replacement cooling system component designed for selected Porsche 911 (997) Turbo, GT2, GT2 RS, GT3 and GT3 RS 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 32

Manufactured to Porsche's original specifications, this coolant hose connects the water pump housing to the coolant supply pipe, helping maintain reliable coolant circulation and effective engine temperature regulation.

The hose forms an essential part of the engine's liquid cooling system, providing a secure and flexible connection between cooling circuit components. It is designed to withstand the temperature changes, pressure fluctuations and vibration experienced during normal engine operation.

Over time, exposure to engine heat, coolant pressure and general ageing can cause the original hose to become hardened, swollen, cracked or weakened, potentially resulting in coolant leaks and reduced cooling system reliability.

The Genuine Porsche Coolant Supply Hose provides a direct original equipment replacement solution, helping restore the integrity of the cooling system while maintaining the correct hose routing and connection arrangement.

Ideal for routine cooling system maintenance, water pump repairs and engine refurbishment, this component helps protect the engine against coolant loss and overheating.

What This Product Does:
The coolant supply hose connects the engine's water pump housing to the coolant supply pipe, providing a sealed passage through which coolant circulates within the engine cooling system.

Its key functions include:

• Coolant Circulation: Allows coolant to flow between the water pump housing and the connected coolant supply pipe.
• Engine Temperature Regulation: Supports the cooling system's ability to maintain the engine within its intended operating temperature range.
• Secure Cooling System Connection: Provides a reliable connection between designated cooling system components.
• Leak Prevention: Helps maintain a sealed cooling circuit, reducing the risk of coolant escaping.
• Cooling System Pressure: Supports the integrity of the pressurised cooling system during normal operation.
• Thermal Resistance: Designed to withstand engine heat and repeated temperature fluctuations.
• Vibration Accommodation: Provides a flexible connection that accommodates normal engine vibration and movement.
• Overheating Prevention: Helps maintain sufficient coolant circulation to support effective engine cooling.
• Engine Protection: Reduces the risk of cooling-related damage by maintaining a dependable coolant flow path.
• Original Equipment Fitment: Maintains Porsche's specified hose dimensions, routing and connection arrangement.

Symptoms Of Wear Or Failure:
Over time, continuous exposure to engine heat, coolant pressure, vibration and ageing can cause coolant supply hoses to deteriorate.

Common signs include:

• Visible Coolant Leaks: Coolant dripping beneath the vehicle or collecting around the water pump housing may indicate a damaged or leaking hose.
• Low Coolant Warning: Coolant escaping from a worn hose may cause the reservoir level to fall, triggering a dashboard warning.
• Frequent Coolant Top-Ups: Repeatedly needing to refill the coolant reservoir may indicate a leak within the cooling system.
• Cracked or Split Hose Material: Visible cracks, splits or surface deterioration may indicate ageing or weakening of the hose.
• Swollen or Bulging Hose: Internal deterioration or abnormal cooling system pressure may cause the hose to expand or deform.
• Hardened or Brittle Rubber: Repeated exposure to high temperatures may reduce flexibility and increase the risk of cracking.
• Soft or Spongy Sections: Localised weakening of the hose structure can indicate internal deterioration.
• Coolant Residue Around Connections: Dried coolant deposits or staining around the hose ends may indicate previous or ongoing leakage.
• Coolant Smell from the Engine Bay: Escaping coolant may produce a distinctive sweet smell, particularly when contacting warm engine components.
• Engine Overheating: Significant coolant loss can reduce the cooling system's ability to regulate engine temperature.
• Fluctuating Engine Temperature: Coolant loss or air entering the cooling system may contribute to unstable temperature readings.
• Steam from the Engine Compartment: A severe coolant leak may allow coolant to contact hot engine components, producing visible steam.
• Loose or Damaged Hose Connections: Deteriorated clamps or damaged connection surfaces may allow coolant to escape.

Why Replacement Matters:

• Replacing a worn, leaking or damaged coolant supply hose is essential for maintaining the reliability, performance and long-term protection of your Porsche's engine cooling system.
• The engine cooling system relies on the continuous circulation of coolant through a sealed network of hoses, pipes and associated components. The coolant supply hose plays an important role by maintaining a secure connection between the water pump housing and the coolant supply pipe.
• As the original hose ages, repeated heating and cooling cycles can cause the material to lose flexibility, develop cracks or weaken around its connection points.
• Even a small coolant leak can gradually reduce the coolant level, limiting the system's ability to control engine temperature effectively.
• If the hose deteriorates further or fails suddenly under pressure, rapid coolant loss may occur, potentially resulting in engine overheating and an unexpected breakdown.
• Overheating can cause serious damage to internal engine components, including cylinder heads, gaskets and associated cooling system parts.
• A correctly fitted Genuine Porsche replacement hose helps restore the original cooling system connection, ensuring appropriate fitment, routing and sealing performance.
• Maintaining reliable engine cooling is particularly important for high-performance Porsche Turbo, GT2 and GT3 models, where the engine can experience substantial thermal loads during demanding driving conditions.
• Replacing deteriorated hoses during water pump servicing or major cooling system maintenance can also help prevent recurring leaks and reduce the likelihood of more expensive repairs.
• The genuine replacement maintains the original equipment configuration, making it suitable for Porsche owners who wish to preserve factory-standard component quality and fitment.

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