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Water Pump and Ancillary Hoses
- 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Related, superseded, cross reference or alternative numbers for comparison.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 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
Porsche 944 S 2.5L 1987-88 M44.40
Porsche 944 S2 3.0L 1989-91 M44.41
Porsche 968 92-95 M44.43/44
Click 'Zoom in' for large parts diagram.
Diagram ref no 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410624104
The product you are viewing cross references to these numbers
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- 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
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Coolant Hose - Water Pump to Solid Coolant Pipe for the Heating System
Maintain reliable coolant circulation and efficient cabin
heating with this OE Match Coolant Hose, designed for Porsche 924S
and Porsche 944 models. This hose connects the water pump to the solid coolant
pipe that feeds the vehicle's heating system, playing a vital role in both
engine temperature regulation and heater performance.
Fits:
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- 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
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Diagram ref no 11
Manufactured to OE specifications, this replacement coolant hose delivers the correct fit, durability and resistance to the high temperatures and pressures found within the Porsche cooling system. Whether you are performing routine maintenance, addressing coolant leaks or restoring a classic transaxle Porsche, replacing ageing coolant hoses helps protect against overheating and cooling system failures.
What Does the Water Pump to Heater Coolant Pipe Hose Do?
The coolant hose connecting the water pump to the solid coolant pipe is an important part of the Porsche 924S and Porsche 944 cooling and heating system. It allows coolant to flow from the water pump into the heater circuit, supplying warm coolant to the heater matrix while maintaining proper coolant circulation throughout the engine.
This hose helps:
- Transfer coolant efficiently through the heating system.
- Maintain stable engine operating temperatures.
- Provide consistent cabin heating performance.
- Support proper coolant circulation throughout the cooling system.
- Prevent pressure loss within the coolant circuit.
Without a properly functioning hose, coolant flow can be compromised, leading to heating issues, coolant leaks and potential engine overheating.
Why Does Coolant Hose 94410624103 Fail?
Like all rubber cooling system components, coolant hoses
deteriorate over time due to age and operating conditions. Common causes of
failure include:
Continuous
exposure to high engine temperatures.
- Coolant chemical degradation.
- Internal hose deterioration.
- Hardening and loss of flexibility.
- Surface cracking and perishing.
- Swelling caused by age and pressure cycles.
- Fatigue around hose clamp connections.
As Porsche 924S and Porsche 944 models continue to age, original coolant hoses often become brittle and prone to sudden failure, even when no external damage is immediately visible.
When Should This Coolant Hose Be Replaced?
Cooling system hoses should be inspected regularly and
replaced whenever signs of wear are detected. Replacement is recommended if you
notice:
- Coolant leaks around the hose connections.
- Cracks, splits or perishing.
- Bulges or swelling in the hose wall.
- Soft or excessively hardened sections.
- Reduced heater performance.
- Unexplained coolant loss.
- During water pump replacement or cooling system refurbishment.
Preventative replacement is strongly recommended during major cooling system servicing to avoid unexpected breakdowns and expensive engine repairs.
Porsche 924S & 944 Cooling and Heating System Maintenance
For owners searching for a Porsche 944 heater hose replacement, Porsche 924S coolant hose 94410624103, water pump to heater pipe hose or Porsche cooling system repair part, this OE Match replacement provides dependable performance and original-style fitment.
The cooling and heating systems on Porsche transaxle models rely on a network of hoses, pipes and coolant passages to maintain temperature control and cabin comfort. Replacing ageing coolant hoses alongside the water pump, thermostat, expansion tank, radiator hoses and heater components helps preserve reliability and maximise cooling efficiency.
Suitable for a range of Porsche 924S and Porsche 944 applications, this OE-quality hose is designed to restore proper coolant circulation and heating system performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410624103
The product you are viewing cross references to these numbers
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
Porsche 944 S 2.5L 1987-88 M44.40
Porsche 944 S2 3.0L 1989-91 M44.41
Porsche 968 92-95 M44.43/44
Click 'Zoom in' for large parts diagram.
Diagram ref no 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410624104
The product you are viewing cross references to these numbers
Water Pump & Ancillary Hoses – Essential Cooling Components for Porsche Performance
Water pump and ancillary hoses are key elements of your Porsche’s cooling system, ensuring efficient coolant circulation between the water pump, radiator, expansion tank, and engine block. These hoses deliver and regulate coolant flow, maintaining stable engine temperatures and preventing overheating under high-performance conditions.
At Design911, we stock a comprehensive range of genuine and manufacturer-quality water pump and ancillary hoses for Porsche models including transaxle, 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each hose is designed for precise fitment, high temperature resistance, and long-term reliability — matching the quality and durability of the original factory components.
What Do Water Pump & Ancillary Hoses Do?
Water pump and ancillary hoses work together as part of the
cooling network to:
- Circulate
coolant through the engine, radiator, and water pump.
- Regulate
temperature for optimal engine efficiency and longevity.
- Maintain
coolant pressure and prevent system airlocks.
- Support auxiliary components such as heater cores and turbo cooling lines.
These hoses ensure consistent coolant flow throughout the system, enabling your Porsche to perform safely at high temperatures and speeds.
Why Do Water Pump and Ancillary Hoses Fail?
Over time, hoses are exposed to constant heat, vibration,
and chemical contact with coolant — factors that can lead to wear and failure.
Common causes include:
- Thermal
degradation from repeated heating and cooling cycles.
- Cracking
or hardening of rubber due to age or coolant additives.
- Leaks
at hose ends or clamps from loss of flexibility or pressure.
- Abrasion
or rubbing against surrounding components.
- Swelling or soft spots from internal coolant corrosion.
Symptoms of failure include coolant leaks, overheating, visible cracks, or the smell of coolant in the engine bay.
Why Replace Faulty Water Pump & Ancillary Hoses?
A leaking or degraded hose can cause serious engine damage by disrupting coolant circulation and leading to overheating. Replacing old or worn hoses ensures your Porsche’s cooling system functions efficiently and safely.
Benefits of replacement include:
- Restored coolant flow and system pressure.
- Prevention of leaks and overheating.
- Enhanced reliability and performance under load.
- Manufacturer-quality materials and factory-accurate fitment.
All hoses in this range are constructed from high-performance, reinforced rubber compounds that meet or exceed Porsche’s engineering standards, ensuring long-term durability, flexibility, and heat resistance.
