Coolant Bottom Supply Hose, LEFT. Porsche 987 Boxster / 987C Cayman / 997 › 99710662105

Coolant Bottom Hose Supply, LEFT
This Genuine Porsche hose connects the engine coolant supply line to the left-side radiator. Part number 99710662105 is intended for the specific Boxster, Cayman and 997 applications listed below.

Fits:
Porsche 987.1 Boxster / S  2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2  Cayman / S 2009 - 2012
Porsche 997 GT3 2007-2010
Porsche 997.1 Carrera 2 / 2S 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 2 / 2S 2009 - 2010 CABRIO/COUPE

Diagram ref no 9

This product supersedes Porsche's old part numbers: 99710662103

What Is This Part?
This is the left-hand supply hose in the radiator section of the cooling system. It joins the engine coolant supply pipework to the left-side radiator, forming part of the connection between the engine cooling circuit and the front radiator assembly. The hose and its end connections must remain sound to contain coolant during operation. When investigating a leak in this area, inspect both the hose itself and the adjoining radiator and pipe connections before deciding which component needs replacement.

What Does This Part Do?

• Carries coolant: Provides the supply connection from the engine coolant line to the left-side radiator.
• Connects the cooling pipework: Joins the supply line and radiator within the radiator-section assembly.
• Contains coolant: Works with its connections to keep coolant within this section of the circuit.
• Provides a flexible connection: Accommodates small movements between the connected components.

Why Replace This Part?

Replacement may be needed if the hose develops a leak, splits, becomes swollen or shows damage around its connections. Ageing, repeated heating and cooling, or rubbing against nearby components can affect a coolant hose's condition. A damaged hose or poorly seated connection can allow coolant loss, so the source of any dampness or residue should be confirmed rather than assuming the radiator itself has failed.

During radiator or cooling-pipe repairs, inspect the existing hose and its mating connections. Renew a damaged hose and address any associated connection or support problem so that the replacement is correctly seated and does not rub against surrounding parts. Removal for another repair does not, by itself, mean an otherwise serviceable hose must be replaced.

When to Replace This Part?

• Confirmed leakage: Fresh coolant appears on the hose or at an end connection.
• Visible deterioration: The hose has cracks, splits, bulges or unusually soft sections.
• Rubbing damage: The outer surface shows abrasion or contact marks from nearby components.
• Connection damage: An end connection is damaged or cannot be seated securely.
• Repeated coolant loss: A pressure test or inspection identifies this hose or its joint as the source.
• During related repairs: Inspection after removal reveals deterioration that would make refitting inappropriate.

A low coolant warning, coolant smell or rising temperature warrants inspection of the cooling system, these symptoms do not identify this hose alone. Allow the system to cool before checking coolant levels or disturbing any connection.

Where Is This Part Fitted?

Location: In the front radiator section of the cooling system, between the engine coolant supply line and the left-side radiator. LEFT identifies the vehicle side, not the driver's seating position.

FAQs

• Could a leak here come from the radiator rather than the hose?
  Yes. Inspect the hose ends, adjoining connections and radiator for fresh wetness or dried coolant residue. A cooling-system pressure test can help establish the source.
• Should the connections be checked when replacing the hose?
  Yes. Inspect the mating connections and retaining hardware, and replace damaged items as required. The hose must be properly seated before the cooling system is refilled and checked.
• Does this replace part number 99710662103?
  Yes. This product supersedes Porsche part number 99710662103. Confirm the application against your vehicle before ordering.

Related reference numbers
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99710662105

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