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

Coolant Bottom Hose Supply - Left 

Keep your Porsche's cooling system operating at peak efficiency with this OE Match Coolant Bottom Hose Supply Left, designed for selected Porsche 987 Boxster, 987C Cayman and 997 models. Manufactured to OE specifications, this premium replacement coolant hose provides the correct fit, flexibility and durability required to ensure reliable coolant circulation throughout the engine cooling system.

Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-12
• Porsche Boxster S 987 MKII 3.4L 2009-12
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 GT3 / GT3 RS 2007-09
• Porsche 997 MKII Carrera C2 3.6L 2009-12
• Porsche 997 MKII Carrera C4 3.6L 2009-12
• Porsche 997 MKII Carrera C2S 3.8L 2009-12
• Porsche 997 MKII GT3 / GT3 RS 2010-11
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman S 3.4L 987C 2005-08
• Porsche Cayman 2.9L 987C MKII 2009-12
• Porsche Cayman S / R 3.4L 987C MKII 2009-12

Diagram ref no 9

As a vital part of the cooling circuit, the lower supply hose carries coolant between major cooling components, helping regulate engine temperature and maintain optimum operating performance. Replacing worn or ageing coolant hoses is an important part of preventative maintenance and helps reduce the risk of coolant loss, overheating and expensive engine damage.

What Does the Coolant Bottom Supply Hose Do?

The left-hand coolant bottom supply hose forms part of the engine's coolant circulation system, allowing coolant to flow efficiently between the radiator and engine cooling circuit.

Its primary functions include:

• Carrying coolant through the engine cooling system.
• Maintaining consistent coolant circulation.
• Helping regulate engine operating temperature.
• Supporting efficient heat transfer from the engine to the radiators.
• Maintaining correct cooling system pressure.
• Helping prevent engine overheating.

A correctly functioning coolant hose is essential for reliable cooling performance in all driving conditions.

Why Do Coolant Hoses Fail?

Coolant hoses operate under constant heat, pressure and vibration. Over time they naturally deteriorate due to:

• Continuous heat cycling.
• Age-related hardening and cracking.
• Internal coolant pressure.
• Exposure to coolant additives and contaminants.
• Engine vibration.
• External abrasion from surrounding components.

As the hose ages it may become brittle, swell, soften or develop small leaks that gradually worsen over time.

When Should the Coolant Bottom Hose Be Replaced?

The coolant hose should be inspected during routine servicing and replaced whenever signs of deterioration are found, including:

• Coolant leaks.
• Cracked or perished rubber.
• Bulging sections.
• Soft or weakened hose walls.
• Coolant staining around hose joints.
• Damaged or corroded hose connections.

Many Porsche specialists recommend replacing ageing coolant hoses whenever the cooling system is being overhauled or when replacing the water pump, thermostat, radiators or expansion tank.

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

99710662105

The product you are viewing cross references to these numbers