Water coolant radiator hose left, Return. Porsche 982 Boxster / 982 Cayman / 991.2  ❭  9P1121623

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

Please note: The hose doesn't come with the clip. Please add to basket separately - 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 2017 - 2019
Porsche 991.2 GT3 4.0L 
Porsche 991.2 GT2 RS 

Please note: The hose doesn't come with the clip. Please add to basket separately.

Diagram ref no 18

The radiator return hose carries coolant through the return side of the cooling circuit after heat exchange. It helps support stable coolant circulation, correct system pressure, and reliable engine temperature control. A secure, leak-free coolant return hose is essential for protecting the engine from overheating and coolant loss.

Functions
•  Replaces the left-side coolant radiator return hose
•  Carries coolant through the radiator return circuit
•  Supports correct coolant circulation and system pressure
•  Helps maintain stable engine operating temperature
•  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 heat, pressure, coolant additives, vibration, and age-related wear. Over time, the hose can harden, soften, swell, crack, split, or leak. A failing return hose may cause coolant loss, low coolant warnings, overheating, steam, or reduced cooling system reliability. Replacing the hose helps restore dependable coolant flow 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 on the dashboard
•   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 left-side radiator return position within the cooling system on Porsche 982 Boxster, 982 Cayman, and 991.2 models. It connects according to the factory coolant hose routing and supports coolant return flow through the radiator circuit.


Related reference numbers
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9P1121623

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