Radiator coolant top hose. Porsche 928 1978-84

Radiator coolant top hose - Upper radiator to water regulator housing.
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Related, superseded, cross reference or alternative numbers for comparison.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

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