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- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
This OE Match radiator return hose is a direct replacement part, manufactured to original specifications for precise fitment and durability. It is installed in the lower section of the cooling system, linking the radiator to the main return pipe or connecting pipe.
Sold each
Fits:
Porsche 986 Boxster 1998 - 2004
Diagram ref no 9
• Position: Lower radiator return hose (left or right side)
• Quantity: Sold individually (2 required per vehicle)
• It replaces earlier part numbers including 99610662701 and 99610662702.
The hose transports coolant from the radiator back into the cooling circuit, helping regulate engine temperature. It ensures that heat absorbed by the coolant is properly dissipated and recirculated through the system.
A properly functioning hose is essential for maintaining stable engine temperatures and preventing overheating.
Over time, coolant hoses can become brittle, crack, or degrade due to heat and pressure. A failing hose can lead to coolant leaks, overheating, and potential engine damage. Replacing worn hoses ensures proper coolant flow, protects the engine, and maintains reliable cooling system performance.
When to replace
• Coolant leaks or visible hose damage
• Cracks, swelling, or soft spots in hose
• Engine overheating or temperature fluctuations
• During cooling system service or overhaul
• Preventative maintenance on ageing vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610662704
The product you are viewing cross references to these numbers
- 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 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
OE Match right-hand coolant supply hose
Fits
- Porsche 987 Boxster 2005-08
- Porsche 987C Cayman 2006-08
- Porsche 987.2 Boxster 2009-12
- Porsche 987C.2 Cayman 2009-12
- Porsche 997.1 Carrera 2005-08
- Porsche 997.1 Turbo / GT3 2007-08
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref: 30
What This Product Does
This hose carries coolant within the supply side of the cooling circuit. Its flexible connection accommodates movement between adjoining components while containing coolant under normal system pressure.
Functions
- Provides the right-hand coolant supply connection.
- Transfers coolant between connected cooling-system components.
- Accommodates movement at the hose connection.
Technical Details
- Supplied part reference: 99710662703; brand: OE Match.
- Position: Right; circuit designation: supply.
Symptoms of Fault
- Falling coolant level or repeated low-level warnings.
- Damp hose connections, dried deposits or undertray staining.
- A sweet odour following use.
- Cracked, swollen, softened or visibly abraded hose sections.
- Gurgling noises or an increasing temperature reading.
Why Replacement Matters
Ageing or damaged hose connections can allow coolant to escape, potentially leading to overheating. Replace a confirmed defective hose and inspect neighbouring pipes, supports, seals and clips to identify related deterioration. OE Match develops replacement components around Porsche applications, using original references and specification checks to assess suitability.
FAQs
How should a suspected leak be checked?
A cooling-system pressure test can help locate seepage at hose ends and adjoining connections rather than relying on symptoms alone.
Why might coolant disappear without leaving a puddle?
Escaping fluid may collect on an undertray or evaporate, leaving deposits instead of an obvious puddle.
What should be checked when selecting this hose?
Compare reference 99710662703, the right-hand position and the vehicle-specific application. The diagram item number varies between models.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662703
The product you are viewing cross references to these numbers
- 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 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
High-quality OE Match replacement coolant line designed to match the original Porsche factory hose in shape, dimensions, and performance. It serves as the right-side return path in the engine cooling system, helping ensure efficient coolant circulation and temperature regulation.
Fits:
Porsche 987 Boxster 2005 - 2008
Porsche 987C Cayman 2006 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.2 Cayman 2009 - 2012
Porsche 997.1 Carrera 2005 - 2008
Porsche 997.1 Turbo / GT3 2007 - 2008
Porsche 997.2 Carrera 2009 - 2012
Porsche 997.2 Turbo / GT3 2009 - 2013
Diagram ref no 32
The return hose carries coolant back toward the engine or radiator after it has circulated through the engine and thermostat housing. A failed or deteriorated hose can lead to coolant leaks, overheating, air ingestion into the cooling system, and potential engine damage if left unchecked. This OE Match replacement ensures a secure seal, proper flow path, and long service life.
This hose installs directly in place of the original with no modification required, making it ideal for repairs, cooling system maintenance, or replacing a soft or aged hose during service intervals.
The coolant return hose provides a pressure-rated, heat-resistant passage for engine coolant to return from the engine head/end tank area back into the cooling circuit. It is an integral part of the cooling loop that manages engine temperature and prevents overheating under load or hot conditions.
Function:
• Transports coolant through the return leg of the cooling system
• Maintains proper sealing and pressure under thermal cycles
• Helps prevent coolant leaks and air entry into the coolant circuit
Over time, coolant hoses degrade due to heat, pressure, and exposure to coolant and environmental factors. A cracked, swollen, or leaking hose can cause loss of coolant, engine overheating, and accelerated wear on other cooling components. Replacing old hoses with an OE Match coolant return hose restores proper coolant routing, improves cooling reliability, and reduces the risk of costly engine damage.
When to replace:
• Visible cracks, bulges, or soft spots in the hose
• Evidence of coolant weeping or staining
• Cooling system overheating or inconsistent temperature readings
• During timing belt or water pump service intervals
• At recommended maintenance intervals or when age-related wear appears
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662403
The product you are viewing cross references to these numbers
- 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 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
OE Match left coolant supply hose
Fits
- Porsche 987 Boxster 2005-08
- Porsche 987C Cayman 2006-08
- Porsche 987.2 Boxster 2009-12
- Porsche 987C.2 Cayman 2009-12
- Porsche 997.1 Carrera 2005-08
- Porsche 997.1 Turbo / GT3 2007-08
- Porsche 997.2 Carrera 2009-12
- Porsche 997.2 Turbo / GT3 2009-13
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no 29
What This Product Does
This flexible coolant connection carries fluid through the vehicle's cooling circuit. Its condition and the sealing of its connections matter when investigating coolant loss.
Functions
- Provides a coolant passage between connected pipework.
- Accommodates movement within the hose connection.
- Helps contain coolant when correctly fitted and sealed.
Technical Details
- Supplied reference: 99710662303.
- Position: Left.
Symptoms of Fault
- Falling coolant level or repeated low-level warnings.
- Sweet odour, damp connections or deposits around hose ends.
- Coolant collecting on the undertray.
- Cracking, swelling, soft patches or rubbing damage.
- Gurgling or an increasing temperature reading.
Why Replacement Matters
Renewing a deteriorated or leaking hose addresses a potential source of coolant loss. Inspect adjoining pipes, retaining clips, seals and supports so that worn connections or rubbing do not remain unresolved. OE Match develops replacement parts around Porsche applications, with specification checks and sample evaluation forming part of its programme.
FAQs
Why might coolant disappear without leaving a puddle?
Escaping fluid can collect on an undertray or evaporate from warm surfaces.
How can a suspected leak be located?
A cooling-system pressure test and inspection of the hose connections can help identify seepage.
What should be checked before fitting?
Confirm the vehicle application and reference, then inspect neighbouring fittings and supports for damage or wear.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662303
The product you are viewing cross references to these numbers
- 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 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
This left coolant return hose by OE Match is replacement hose for the left-hand return circuit.
Fits
- Porsche 987 Boxster
- Porsche 987C Cayman
- Porsche 997
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no 31
What This Product Does
The hose carries returning coolant through its designated connection within the cooling circuit. It is the left-hand return component, rather than a supply hose or the adjoining rigid pipework.
Functions
- Provides a passage for coolant returning through the circuit.
- Connects the adjoining cooling-system components at the specified left-hand position.
Technical Details
- Brand: OE Match; product reference: 99710672803.
- Position and purpose: Left, coolant return line.
Symptoms of Fault
Possible signs include falling coolant levels, a sweet odour, damp connections, dried deposits around joints, swollen hose sections or leakage after shutdown. Gurgling and an increasing temperature reading can accompany coolant loss, but do not identify this hose alone as the cause.
Why Replacement Matters
Renewal is appropriate when inspection confirms deterioration, abrasion or leakage. Check nearby pipes, retaining brackets, connectors and clamps during the repair: an unresolved supporting fault can leave the replacement connection vulnerable to further damage.
FAQs
How can a suspected leak be located?
A cooling-system pressure test, combined with inspection of hose ends and adjoining connections, can help establish the source.
Why might coolant disappear without leaving a puddle?
Escaping coolant may collect on an undertray or evaporate before reaching the ground.
Does gurgling confirm hose failure?
No. Air entering through a leak or insufficient coolant can produce similar sounds; diagnose the complete circuit.
What should be checked before fitting?
Match the reference, model, engine and production details, then inspect the connecting hardware and supporting pipework.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710672803
The product you are viewing cross references to these numbers