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Radiator Top / Bottom Hoses
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 944 2.5L 8V 1982-87
Fits:
Porsche 924 - 1976 to 1985
Porsche 944 - 1982 to 1985
Click 'Zoom in' for large parts diagram.
Diagram ref no 14
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
046121099
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
Fits:
Porsche 944 1982-85
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623705
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
Fits:
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623707
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
The OE Match Radiator Hose Bottom to Water Pump is a high-quality replacement cooling system hose designed to carry cooled coolant from the lower section of the radiator directly to the engine water pump. Manufactured to OE specifications for fit, durability and performance, this hose is a vital component in maintaining efficient coolant circulation and engine temperature control.
Fits:
- Porsche 944 2.5L 8V 1982-87
Diagram Ref No 8
Constructed from premium heat-resistant and coolant-resistant rubber materials, the hose is engineered to withstand continuous exposure to temperature fluctuations, coolant pressure and engine bay conditions. It ensures a secure and leak-free connection between the radiator and water pump, helping to maintain the effectiveness of the entire cooling system.
What This Product Does:
- Transfers cooled coolant from the radiator to the water pump.
- Supports continuous coolant circulation throughout the engine.
- Helps maintain correct engine operating temperatures.
- Provides a secure and leak-resistant connection within the cooling system.
- Assists in preventing engine overheating.
- Supports efficient cooling system performance.
- Contributes to long-term engine reliability and protection.
Symptoms Wear Or Failure:
- Visible coolant leaks around the hose or connections.
- Coolant drips beneath the vehicle.
- Low coolant level warnings.
- Engine overheating or fluctuating temperature readings.
- Sweet coolant smell from the engine bay.
- Cracks, splits or bulges in the hose material.
- Soft, swollen or brittle rubber construction.
- Coolant residue around hose fittings.
- Loss of cooling system pressure.
Why Replacement Matters:
- Lower radiator hoses operate in demanding conditions and are continuously exposed to coolant flow, pressure changes, heat cycles, vibration and environmental ageing. Over time, the rubber material can deteriorate, harden, crack or weaken, increasing the likelihood of leaks or sudden hose failure.
- A damaged radiator hose can lead to coolant loss, reduced cooling efficiency and engine overheating. If coolant circulation is interrupted, critical engine components may be exposed to excessive temperatures, potentially resulting in costly engine repairs. Even minor leaks can progressively worsen and compromise the reliability of the cooling system.
- Replacing a worn radiator hose restores proper coolant circulation, helps maintain correct engine temperatures and protects against overheating-related damage. An OE Match replacement provides factory-style fitment, dependable durability and long-term performance, ensuring reliable operation of your Porsche cooling system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623705
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
Direct-fit replacement hose for the radiator lower hose on Porsche 944 road cars (models 1985 through 1989). It connects the bottom outlet of the radiator to the water pump inlet, forming a critical part of the engine’s coolant circulation system. Precision-moulded to original shape and dimensions, this hose fits exactly as the factory part did - ensuring correct routing, secure sealing, and reliable coolant flow under pressure and high engine temperatures.
Fits:
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
• Application: Lower radiator hose — radiator bottom outlet → water pump inlet.
• Ideal Use Cases: Cooling system maintenance, hose replacement during service, overheating prevention, or when original hose shows wear, cracks or leaks.
Coolant hoses are subject to continuous heat cycling, coolant chemical exposure, and flexing from engine vibration. Over time the rubber can degrade - becoming brittle, soft, cracked, or swollen. A failing radiator hose may lead to:
• Coolant leaks - causing low coolant levels or visible drips under the car.
• Engine overheating - risking long-term engine damage or immediate breakdown.
• Loss of coolant pressure or air ingress - potentially reducing cooling system efficiency.
Using a new hose restores reliable coolant circulation, helps prevent leaks, supports stable engine temperature, and reduces the risk of costly engine overheating or damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623707
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Fits:
Porsche 944 1985-91
Click 'Zoom in' to see the diagram.
Diagram ref no 9.
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Related, superseded, cross reference or alternative numbers for comparison.
94410623907
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Radiator Top Hose
Keep your Porsche 944 cooling system operating at peak
efficiency with this OE Match Radiator Top Hose, designed specifically for
Porsche 944 models manufactured between 1985 and 1991. This critical cooling
system component provides a reliable connection between the engine and
radiator, ensuring the continuous flow of coolant needed to regulate engine
temperatures and prevent overheating.
Fits:
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
Diagram ref no 9
Manufactured to OE specifications, this replacement radiator top hose delivers excellent fitment, durability and resistance to the high temperatures and pressures experienced within the Porsche 944 cooling system. Whether you are carrying out preventative maintenance, repairing a coolant leak or restoring a classic transaxle Porsche, replacing worn cooling hoses is essential for long-term reliability.
What Does the Radiator Top Hose Do?
The radiator top hose is one of the most important hoses within the Porsche 944 cooling system. It carries hot coolant from the engine to the radiator, where excess heat is dissipated before the coolant circulates back through the system.
Without a properly functioning radiator top hose, coolant flow can become restricted or interrupted, leading to overheating, pressure loss and potential engine damage. The hose must withstand constant temperature fluctuations, pressure changes and vibration while maintaining a secure seal at both ends.
Why Do Radiator Top Hoses Fail?
Over time, radiator hoses naturally deteriorate due to
exposure to heat, pressure and coolant chemicals. Common causes of failure
include:
- Age-related rubber hardening and cracking.
- Internal hose degradation from coolant contamination.
- Swelling caused by prolonged heat exposure.
- Surface perishing and loss of flexibility.
- Weakening around hose clamp connection points.
- Splits, bulges or soft spots developing within the hose wall.
Many Porsche 944 models are now several decades old, making cooling system hose replacement an important preventative maintenance task.
When Should the Radiator Top Hose Be Replaced?
Radiator hoses should be inspected regularly and replaced
whenever signs of wear become evident. Replacement is recommended if you
notice:
- Coolant leaks around the hose connections.
- Cracked, brittle or swollen rubber.
- Coolant smells after driving.
- Soft or excessively hard hose sections.
- Unexplained coolant loss.
- Rising engine temperatures or overheating concerns.
- During cooling system overhauls or engine restoration projects.
Replacing ageing hoses before failure occurs can help prevent expensive engine repairs and roadside breakdowns.
Porsche 944 Cooling System Hose Replacement
For owners searching for a Porsche 944 upper radiator hose replacement, OE match coolant hose, Porsche 944 cooling system repair parts or radiator hose upgrade, this component offers an ideal solution that maintains original cooling system performance.
A healthy cooling system is essential for preserving engine reliability, particularly on classic Porsche models. Replacing ageing radiator hoses alongside thermostats, water pumps, expansion tanks, coolant sensors and other cooling system components can significantly improve system efficiency and long-term dependability.
Designed for Porsche 944 models produced from 1985 to 1991, this OE-quality radiator top hose provides dependable coolant flow and helps maintain stable operating temperatures under all driving conditions.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623907
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
Fits:
Porsche 944 2.5L 1981-1983 Engine type: 4401 / 4402 / 4403 / 4404
M >> 41D 1285
M >> 41D 5164
M >> 43D 3439
M >> 43D 5517
Click 'Zoom in' for large parts diagram.
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623912
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
Fits:
Porsche 944 2.5L 1981-1983 Engine type: 4401 / 4402 / 4403 / 4404
M >> 41D 1285
M >> 41D 5164
M >> 43D 3439
M >> 43D 5517
Click 'Zoom in' for large parts diagram.
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623912
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
Fits:
Porsche 944 1983-85
Engine type: 4401 / 4402 / 4403 / 4404
M 41D 1286 >>
M 41D 5165 >>
M 43D 3440 >>
M 43D 5518 >>
Diagram ref no 9A
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Related, superseded, cross reference or alternative numbers for comparison.
94410623902
The product you are viewing cross references to these numbers
- Porsche 944 2.5L 8V 1982-87
This replacement coolant hose connects the upper radiator outlet to the cylinder head on early Porsche 944 models (1983-85). This hose conforms to original Porsche specifications in diameter, length, routing, and material grade. Constructed from high-temperature-resistant rubber with the correct wall thickness, it restores proper coolant flow, prevents leaks, and maintains the reliability of the vehicle's cooling system.
Fits:
Porsche 944 1983 - 1985
Engine type: 4401 / 4402 / 4403 / 4404
M 41D 1286 >>
M 41D 5165 >>
M 43D 3440 >>
M 43D 5518 >>
Diagram ref no 9A.
• Position on Vehicle: Engine bay – upper radiator hose connecting the top of the radiator to the cylinder head.
The upper radiator hose is a critical link in the engine’s cooling circuit: if it fails, you risk coolant leaks, overheating, engine damage, loss of heater performance and unexpected roadside breakdowns. Symptoms of a failing hose include bulging, cracking, coolant smell, visible coolant loss or temperature rise. Replacing the hose ensures proper coolant delivery, secure clamping, correct routing and long-term reliability.
When and why to replace:
• Visible cracks, bulging or soft spots on the existing hose.
• Hose has become hard, inflexible or distorted and may collapse under engine vacuum/pressure.
• Leaks or coolant loss are detected at the top radiator connection.
• During cooling system service: radiator removal, cylinder head service or hose age exceeds recommended lifespan (especially on classic vehicles).
• When the vehicle is undergoing restoration and you require correct-spec parts for peace of mind and authenticity.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410623902
The product you are viewing cross references to these numbers
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.
