Radiator bottom return hose, short. Porsche 991 Carrera / 981 Boxster / 981C Cayman › 99110662

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OE Match

99110662

Product Information

OE Match short radiator bottom return hose, left- and right-hand references identify the corresponding hose positions.

Fits

Porsche 991.1 Carrera 2012-16
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram ref no 9

What This Product Does

This short hose forms the radiator's lower return connection within the coolant circuit. It carries returning coolant through the radiator-section pipework; it is distinct from the longer supply hoses shown in the assembly diagrams.

Functions

Provides a passage for returning coolant.
Connects the radiator return section to adjoining coolant pipework.
Accommodates movement at the hose connection.

Technical Details

Component: short coolant radiator bottom return hose.
Left-hand reference: 99110662502.
Right-hand reference: 99110662602.
Brand: OE Match.
Diagram positions vary by application; match the reference to the required side.

Symptoms of Fault

Coolant pooling beneath the front or collecting on the undertray.
Damp connections, staining or dried deposits around hose ends.
A sweet odour accompanied by falling coolant level.
Cracked, swollen or softened hose sections.
Low-coolant warnings, gurgling or increased engine temperature.

Why Replacement Matters

Renewing a deteriorated or leaking return hose addresses coolant loss at that connection. Inspect adjoining fittings, seals and retaining hardware during the repair, since an unresolved connection fault can cause further seepage. OE Match's Porsche-focused replacement programme uses application and original-reference checks to identify suitable components.

FAQs

How do I select the correct side?
Match the original reference and diagram position: 99110662502 identifies the left hose; 99110662602 identifies the right hose.

Does front-end coolant leakage confirm hose failure?
No. Inspect the radiator and neighbouring joints too; a cooling-system pressure test can help locate the source.

Why might a leak appear intermittently?
Seepage can become apparent only as coolant temperature and system pressure increase.

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Related, superseded, cross reference or alternative numbers for comparison.

99110662

99110662502

99110662602

The product you are viewing cross references to these numbers

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                            Water coolant radiator hose top left, feed. Porsche 982 / 991.2 / GT4
                        
                        9P1121611
                    
Product InformationProduct Information

                            Water coolant radiator hose top left, feed. 

Fits:
Porsche 982 (718) Boxster 2017>>
Porsche 982SP (718) Boxster Spyder 2019>>
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Diagram ref no 19

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9P1121611
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                            Water coolant radiator hose top left, feed. Porsche 982 / 991.2 / GT4
                        
                        9P1121611/1
                    
Product InformationProduct Information

                            Water coolant radiator hose top left, feed.
This OE Match top left water coolant radiator hose is a replacement feed hose for Porsche 982, 991.2, and GT4 models. It is designed to match the original-style fitment and function, helping maintain correct coolant flow through the vehicle’s cooling system.

Please note: Requires new jubilee clip. Available separately - part number 99951249900

Fits:
Porsche 982 (718) Boxster 2017>>
Porsche 982SP (718) Boxster Spyder 2019>>
Porsche 982C (718) Cayman 2017>>
Porsche GT4.2 Cayman 2019>>

Porsche 991.2 Carrera 2016 - 2021
Porsche 991.2 GT3 4.0L 
Porsche 991.2 GT2 RS 

Diagram ref no 19

The top left radiator feed hose carries coolant through the radiator circuit, helping regulate engine temperature and support efficient heat transfer. A secure, leak-free coolant hose is essential for maintaining correct cooling system pressure and protecting the engine from overheating.

Functions
• Replaces the top left coolant radiator feed hose
• Carries coolant through the radiator and engine cooling circuit
• Helps maintain correct engine operating temperature
• Supports cooling system pressure and coolant circulation
• Helps prevent coolant leaks, pressure loss, and overheating
• Replaces cracked, swollen, split, leaking, or aged original hoses
• OE Match replacement for cooling system repair and maintenance.

Why Replace This Part?
Coolant radiator hoses are exposed to constant heat, pressure, coolant additives, vibration, and age-related wear. Over time, the hose can harden, soften, swell, crack, split, or leak. A failing hose may cause coolant loss, low coolant warnings, overheating, steam, or reduced cooling system reliability. Replacing the hose helps restore dependable coolant circulation and protects the engine from heat-related damage.

When to Replace This Part
•  The radiator hose is cracked, swollen, brittle, soft, or split
•  Coolant leaks are visible around the hose or connection points
•  The engine is overheating or coolant level is dropping
•  Low coolant warnings appear
•  The hose has become loose, contaminated, or damaged
•  The radiator, water pump, thermostat, or coolant pipes are being serviced
•  Preventative replacement is being carried out during cooling system maintenance.

Where it fits on the car
This hose fits in the top left radiator feed position within the cooling system on Porsche 982, 991.2, and GT4 models. It connects according to the factory coolant hose routing and supports coolant flow through the radiator circuit.

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

9P1121611
 9P1121611

The product you are viewing cross references to these numbers 
                        
                                            9 
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                                            9 
                                            9 
                                            9 
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                            O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
                        
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Product InformationProduct Information

                            O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
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Porsche 981 Boxster 2012-16 
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Porsche 981 Cayman 2014-16 
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Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

Related reference numbers
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99610680103
 99610680103

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                                            9 
                                            9 
                                            9 
                                            9 
                                            9 
                                            9 
                                            9 
                                            9 
                                            9 
                            
                            O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
                        
                        99610680103/1
                    
Product InformationProduct Information

                            O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
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Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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

99610680103
 99610680103

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Radiator bottom return hose, short. Porsche 991 Carrera / 981 Boxster / 981C Cayman › 99110662