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Radiator Top / Bottom Hoses
Fits:
Porsche 928 1978-1984
Click 'Zoom in' for large parts diagram.
Diagram ref no 19
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810623806
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
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12 Month Warranty
Worldwide Delivery
Replacement hose for the upper radiator hose used in Porsche 928 models. It connects the radiator to the temperature regulator (thermostat/expander) housing, which is part of the engine cooling system. It ensures proper coolant flow between the radiator and engine, supporting precise temperature control.
Fits:
Porsche 928 1978 - 1984
Diagram ref no 19
• Location: Upper radiator hose — radiator to thermostat / water-regulator housing
• Use Case: Replacement during maintenance, cooling system overhaul, or when hose shows leak, age or wear
Manufactured to the original dimensions, inside diameter, and hose shape, this replacement hose ensures a proper fit and reliable seal without the need for modification. Made of high-quality, heat-resistant rubber, it withstands engine temperatures, pressure cycles, and coolant exposure, ensuring reliable, long-lasting performance.
This hose is especially useful when the original hose becomes brittle, cracked, swollen, or leaking, which are common problems in older cooling systems. Installing a new hose helps prevent coolant leaks, overheating, and potential engine damage.
Hoses degrade over time due to heat, coolant chemicals, age, and repeated expansion / contraction. A failing radiator hose can lead to:
• Coolant leaks under bonnet or beneath car
• Engine overheating or overheating under heavy load
• Loss of coolant pressure or coolant circulation
• Risk of engine damage due to poor cooling
Replacing it with a correctly spec’d hose helps maintain coolant circulation, prevents leaks, and safeguards the engine’s cooling system reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810623806
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 1985-95
Click 'Zoom in' for large parts diagram.
Diagram ref no 19
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810623808
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Radiator Coolant Top Hose
The OE Match Radiator Coolant Top Hose is a replacement
upper radiator hose for Porsche 928 models manufactured between 1985 and 1995.
Fits:
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram ref no 19
Designed to maintain coolant circulation between the engine and radiator, this hose helps regulate engine temperature and prevent overheating.
Over time, original coolant hoses can become brittle, swollen or cracked due to constant exposure to heat, pressure and coolant.
Replacing a deteriorated hose helps maintain cooling system reliability and reduces the risk of coolant leaks or engine overheating.
What Does It Do?
The upper radiator hose carries hot coolant from the engine towards the radiator, where heat is removed before the coolant circulates back through the cooling system.
It plays an essential role in maintaining the correct engine operating temperature.
Why Does It Fail?
Common causes of failure include:
- Age-related rubber deterioration
- Cracking caused by repeated heat cycles
- Swelling or softening from coolant contamination
- Excessive cooling system pressure
- Damage around hose connections
- General wear after prolonged use
When Should It Be Replaced?
Replace the hose if you notice:
- Visible cracks or splits
- Coolant leaks around the hose or connections
- Swollen, soft or hardened rubber
- Coolant loss or overheating
- Damage discovered during cooling system maintenance
Inspect the hose regularly, particularly on older Porsche 928 models.
Installation Notes
Allow the engine to cool completely before removing the original hose. Inspect the hose connections and clips, replacing damaged clamps where necessary.
Refill the cooling system with the correct coolant mixture, bleed according to Porsche workshop instructions and check for leaks.
Porsche 928 Radiator Hoses & Cooling System Parts
The Porsche 928 cooling system relies on correctly functioning radiator hoses to circulate coolant and maintain stable engine temperatures.
OE Match radiator coolant top hose 92810623808 provides a replacement for compatible Porsche 928 models from 1985 to 1995, helping prevent coolant leaks and maintain reliable engine cooling.
Design911 supplies Porsche 928 radiator hoses, coolant pipes, thermostats, water pumps and associated cooling system components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810623808
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Shop Securely
12 Month Warranty
Worldwide Delivery
Radiator Top & Bottom Hoses – Reliable Cooling for Porsche Performance
Radiator top and bottom hoses are vital components of your Porsche’s cooling system, responsible for transporting coolant between the radiator and the engine. The top hose carries hot coolant from the engine to the radiator for cooling, while the bottom hose returns the cooled fluid back to the engine, maintaining optimal operating temperatures for performance, efficiency, and reliability.
At Design911, we offer a full range of genuine and manufacturer-quality radiator top and bottom hoses for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each hose is precision-engineered for perfect fitment, high pressure tolerance, and exceptional heat resistance — ensuring reliable cooling under the most demanding driving conditions.
What Do Radiator Top and Bottom Hoses Do?
Coolant hoses are the lifelines of your Porsche’s cooling
system, and the radiator hoses perform the following key functions:
- Carry
coolant between the radiator and the engine.
- Regulate
engine temperature for consistent performance.
- Maintain
coolant pressure throughout the cooling circuit.
- Prevent overheating by ensuring efficient heat transfer.
Both the top and bottom hoses are designed to withstand high heat, vibration, and coolant pressure, providing dependable performance in every driving scenario.
Why Do Radiator Hoses Fail?
Over time, radiator hoses deteriorate due to heat, pressure,
and exposure to coolant. Common causes of hose failure include:
- Rubber
cracking or hardening from continuous heat cycles.
- Swelling
or soft spots due to coolant chemical breakdown.
- Leaks
at hose ends or clamps from pressure loss.
- Abrasion
damage caused by engine vibration or contact.
- Age-related material fatigue, especially in older vehicles.
Symptoms of hose failure include coolant leaks, visible cracks or bulges, fluctuating engine temperature, or a noticeable coolant smell in the engine bay.
Why Replace Faulty Radiator Hoses?
A leaking or weakened radiator hose can lead to overheating, coolant loss, and potential engine damage. Replacing these hoses as part of routine maintenance ensures consistent cooling performance and reliability.
Benefits of replacement include:
- Restored coolant flow and temperature stability.
- Prevention of leaks and overheating.
- Improved cooling system pressure and performance.
- Manufacturer-quality materials for long-term durability.
All radiator hoses in this range are made using reinforced, high-grade rubber and polymer compounds, designed to meet or exceed factory specifications for heat resistance, flexibility, and longevity.
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