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Radiator Top / Bottom Hoses
By OE Match
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Radiator Coolant Bottom Hose
The OE Match Radiator Coolant Bottom Hose is a replacement
lower radiator hose designed for Porsche 928 models manufactured between 1987
and 1995.
Fits:
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram Ref No 15
This hose forms an essential part of the engine cooling system, carrying cooled coolant from the radiator towards the engine to help maintain the correct operating temperature.
Over time, original radiator hoses can become brittle, swollen or cracked due to constant exposure to heat, pressure and coolant.
Replacing a deteriorated bottom radiator hose helps prevent coolant leaks, overheating and potential engine damage.
What Does It Do?
The lower radiator hose carries coolant from the radiator back towards the engine, allowing it to circulate through the cooling system.
It helps maintain consistent coolant flow and stable engine temperatures during normal driving and demanding operating conditions.
Why Does It Fail?
Common causes of failure include:
- Age-related rubber deterioration
- Cracking from repeated heating and cooling
- Swelling or softening caused by 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, splits or bulges
- Coolant leaks around the hose connections
- Soft, swollen or hardened rubber
- Unexplained coolant loss
- Engine overheating
- Deterioration discovered during cooling system servicing
Installation Notes
Allow the engine to cool completely before removing the original hose. Inspect the radiator connections and hose clamps, replacing worn components 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 maintain efficient coolant circulation and prevent overheating.
OE Match radiator coolant bottom hose 92810623909 provides a replacement for compatible Porsche 928 models from 1987 to 1995, helping restore cooling system reliability.
Design911 supplies Porsche 928 upper and lower radiator hoses, coolant pipes, thermostats, water pumps and associated cooling system components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92810623909
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
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 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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
Radiator top and bottom hoses carry coolant between the engine and the radiator on Porsche models, helping to regulate operating temperature and support reliable running across everyday use and more demanding driving. OEMatch radiator top and bottom hoses are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable.
Available Types- Moulded top hose and shaped bottom hose to match common Porsche coolant routing
- Reinforced rubber and fabric-wrapped constructions for higher temperature or pressure applications
- Complete hose assemblies including integrated fittings where applicable
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original radiator top and bottom hoses. OE (Original Equipment) refers to parts matching original specifications for the radiator top and bottom hoses and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM radiator top and bottom hoses engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. Radiator hoses route hot coolant to the radiator and return cooled fluid to the engine; they are formed to fit around intake and accessory components and use clamps or quick-fit fittings to secure connections. OEMatch focuses on radiator top and bottom hose items selected for Porsche applications.
Benefits Include- Restored coolant flow and improved temperature stability
- Reduced risk of leaks and loss of coolant
- Materials chosen for heat resistance and flexibility to cope with engine movement
- Thermal ageing and repeated heat cycles cause rubber to harden and crack
- Chemical degradation from coolant additives can produce soft spots or swelling
- Abrasion, clamp wear or routing contact can lead to local damage and leaks
A failing hose can allow coolant loss and lead to overheating with risk to the engine. Replacing worn hoses maintains cooling circuit pressure and flow, supports stable engine temperature on Porsche models and reduces the chance of roadside breakdown. Fit the correct hose profile and use appropriate clamps or fittings to avoid leaks and ensure a reliable connection.
Advantages- Made to original-spec dimensions where applicable to aid fitment and routing
- Fits original mounting points and clearances to minimise refit work
- Available in multiple constructions to match repair needs and operating conditions
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified.
