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Heater hoses & pipes
Heater Valve Connecting Hose – Coolant System Hose
High-quality replacement heater valve connecting hose designed for Porsche 928 models from 1985 to 1995.
This hose connects the heater valve within the cooling
system, allowing proper coolant flow to the heater matrix. It plays a critical
role in maintaining effective cabin heating and overall cooling system
performance.
Fits:
- Porsche 928S2 4.7L 1985-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram ref no 4
Manufactured to OEM specifications, this hose ensures precise fitment, durability, and resistance to heat and pressure—ideal for maintenance, repair, or restoration of your Porsche 928.
Key Features
• Direct replacement heater valve connecting hose
• Suitable for Porsche 928 (1985–1995)
• Ensures correct coolant flow to heater system
• OEM-style fit and performance
• Heat- and pressure-resistant construction
• Ideal for cooling and heating system maintenance
Function and Purpose
This hose forms part of the vehicle’s cooling and heating system.
It helps to:
• Transfer coolant to and from the heater valve
• Support efficient cabin heating performance
• Maintain proper coolant circulation
• Prevent leaks and pressure loss within the system
Why Replace Your Heater Hose
Over time, coolant hoses can degrade due to heat cycles and ageing.
Common issues include:
• Cracking or hardening of rubber
• Coolant leaks
• Reduced heating efficiency
• Risk of hose failure under pressure
Replacing the hose restores system reliability and prevents costly damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857456703
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
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Heater Valve Connecting Hose – Coolant System Hose
High-quality replacement heater valve connecting hose designed for Porsche 928 models from 1985 to 1995.
This hose connects the heater valve within the cooling
system, allowing proper coolant flow to the heater matrix. It plays a critical
role in maintaining effective cabin heating and overall cooling system
performance.
Fits:
- Porsche 928S2 4.7L 1985-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram ref no 4
Manufactured to OEM specifications, this hose ensures precise fitment, durability, and resistance to heat and pressure—ideal for maintenance, repair, or restoration of your Porsche 928.
Key Features
• Direct replacement heater valve connecting hose
• Suitable for Porsche 928 (1985–1995)
• Ensures correct coolant flow to heater system
• OEM-style fit and performance
• Heat- and pressure-resistant construction
• Ideal for cooling and heating system maintenance
Function and Purpose
This hose forms part of the vehicle’s cooling and heating system.
It helps to:
• Transfer coolant to and from the heater valve
• Support efficient cabin heating performance
• Maintain proper coolant circulation
• Prevent leaks and pressure loss within the system
Why Replace Your Heater Hose
Over time, coolant hoses can degrade due to heat cycles and ageing.
Common issues include:
• Cracking or hardening of rubber
• Coolant leaks
• Reduced heating efficiency
• Risk of hose failure under pressure
Replacing the hose restores system reliability and prevents costly damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857456703
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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The Genuine Porsche 92857410603 coolant / heater pipe is an OE cooling and heater system pipe for Left Hand Drive Porsche 928 1978–1995 models. It helps route coolant through the heater circuit, supporting correct cabin heater operation and cooling system function. Ideal for replacing a leaking, corroded or damaged original pipe while maintaining Genuine Porsche fitment and quality.
Fits:
for LHD (Left hand drive) cars only
Porsche 928 1978 - 1995
Diagram ref no 5
This part is specifically for Left Hand Drive (LHD) Porsche 928 applications.
What This Part Does / Functions
• Routes coolant through the heater circuit
• Connects part of the engine cooling system to the cabin heater system
• Supports correct coolant flow for heater operation
• Helps maintain proper engine cooling system circulation
• Replaces a corroded, damaged, leaking or blocked original pipe
• Helps prevent coolant loss from the heater pipe area
• Provides correct Genuine Porsche fitment for LHD vehicles
• Maintains the factory coolant and heater pipe layout.
Why Replace This Part?
Coolant and heater pipes are exposed to coolant, heat cycles, pressure, corrosion, vibration and age-related deterioration. Over time, the original pipe may corrode, weaken, leak or become restricted. A leaking heater pipe can cause coolant loss, overheating risk, heater performance issues and coolant smell around the vehicle. Replacing it with a Genuine Porsche coolant / heater pipe helps restore the correct factory coolant routing and reliable heater system operation.
Common Symptoms of a Faulty Coolant / Heater Pipe
• Coolant leak from the heater pipe area
• Low coolant level warning or regular coolant top-ups
• Sweet coolant smell from the engine bay or cabin area
• Reduced cabin heater performance
• Visible corrosion or damage on the pipe
• Coolant residue around pipe connections
• Overheating caused by coolant loss
• Pipe damage found during cooling system inspection.
When to Replace
• This Part If the original pipe is leaking, corroded or damaged
• During heater hose or heater valve replacement
• During cooling system overhaul
• If coolant loss is traced to the heater pipe circuit
• When restoring the heater system on a Porsche 928
• If the pipe has become blocked or restricted
• During engine bay restoration
• When replacing aged cooling system components with Genuine Porsche parts.
Where It Fits on the Car
This pipe fits within the coolant / heater circuit on Left Hand Drive Porsche 928 models. It forms part of the coolant routing between the engine cooling system and cabin heater system.
Correct installation is important to prevent coolant leaks, maintain heater operation and preserve the original Porsche 928 cooling system layout.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857410603
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
- 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
The Genuine Porsche 92857410603 coolant / heater pipe is an OE cooling and heater system pipe for Left Hand Drive Porsche 928 1978–1995 models. It helps route coolant through the heater circuit, supporting correct cabin heater operation and cooling system function. Ideal for replacing a leaking, corroded or damaged original pipe while maintaining Genuine Porsche fitment and quality.
Fits:
for LHD (Left hand drive) cars only
Porsche 928 1978 - 1995
Diagram ref no 5
The coolant / heater pipe carries engine coolant through the heater circuit, allowing hot coolant to flow to the heater system for cabin heating and demisting. A correctly fitted pipe helps maintain coolant flow, system pressure, and heating performance while preventing leaks from aged or corroded pipework.
Functions
• Replaces the coolant / heater pipe
• Designed for Left Hand Drive vehicles
• Routes coolant through the heater circuit
• Supports cabin heater and demister operation
• Helps maintain cooling system pressure and circulation
• Helps prevent coolant leaks from worn or corroded pipework
• Suitable for heater system service, coolant leak repair, or restoration
• OE Match replacement for Porsche 928 heating and cooling system maintenance.
Why Replace This Part?
Coolant and heater pipes can corrode, crack, block, leak, or become damaged due to age, coolant exposure, heat cycles, pressure, and long-term use. A worn pipe may cause coolant loss, poor heater performance, coolant smell, dampness, pressure loss, or overheating symptoms. Replacing the pipe helps restore reliable coolant flow and heater system operation.
When to Replace This Part
• Coolant leak is visible from the heater pipe area
• Pipe is corroded, cracked, damaged, or blocked
• Heater output is poor or inconsistent
• Coolant smell or residue is present
• Cooling system pressure loss is detected
• Heater system or cooling system service is being carried out
• Vehicle is undergoing Porsche 928 restoration or preventive maintenance
Where it fits on the car
This pipe fits within the coolant / heater circuit on Left Hand Drive Porsche 928 models. It forms part of the coolant routing between the engine cooling system and the cabin heater system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857410603
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
- 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
Vacuum Hose Distribution Y-Piece – 4mm Vacuum Line
Splitter
Sold each - used in various locations
High-quality vacuum hose distribution Y-piece designed for a wide range of Porsche models including 911, 964, 924S, 944, 968, and 928.
This Y-splitter allows a single vacuum source to be divided into two outlets, enabling efficient routing and connection of vacuum lines within the engine bay or HVAC system. It is specifically designed for vacuum hoses with a 4mm outer diameter, ensuring a secure and precise fit.
Fits:
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- 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
- 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
- Porsche 928S2 4.7L 1984-86
Diagram ref no 4
Manufactured to OEM standards, this connector is ideal for maintaining or restoring vacuum system integrity across multiple Porsche applications.
Key Features
• Universal-style vacuum Y-piece connector
• Suitable for Porsche 911, 964, 924S, 944, 968, and 928
• Designed for 4mm outer diameter vacuum hoses
• Enables splitting of vacuum lines
• OEM-style fit and function
• Durable construction for long-term reliability
Function and Purpose
This Y-piece is a critical connector within the vacuum system.
It helps to:
• Split a single vacuum line into two outputs
• Maintain proper vacuum routing
• Ensure consistent vacuum pressure distribution
• Support engine and HVAC system operation
Why Replace Your Vacuum Connector
Over time, vacuum connectors can degrade due to heat and age.
Common issues include:
• Cracked or brittle plastic
• Vacuum leaks
• Poor hose connections
• Engine or HVAC system malfunctions
Replacing the Y-piece restores proper vacuum system function.
• Loose or unsecured temperature sensor
• Incorrect temperature readings
• HVAC system inconsistencies
• Broken or missing connector clips
Replacing the lock piece restores proper sensor stability and function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857372702
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- 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
- 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
- Porsche 928S2 4.7L 1984-86
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12 Month Warranty
Worldwide Delivery
Vacuum Hose Distribution Y-Piece – 4mm Vacuum Line
Splitter
Sold each - used in various locations
High-quality vacuum hose distribution Y-piece designed for a wide range of Porsche models including 911, 964, 924S, 944, 968, and 928.
This Y-splitter allows a single vacuum source to be divided into two outlets, enabling efficient routing and connection of vacuum lines within the engine bay or HVAC system. It is specifically designed for vacuum hoses with a 4mm outer diameter, ensuring a secure and precise fit.
Fits:
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- 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
- 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
- Porsche 928S2 4.7L 1984-86
Diagram ref no 4
Manufactured to OEM standards, this connector is ideal for maintaining or restoring vacuum system integrity across multiple Porsche applications.
Key Features
• Universal-style vacuum Y-piece connector
• Suitable for Porsche 911, 964, 924S, 944, 968, and 928
• Designed for 4mm outer diameter vacuum hoses
• Enables splitting of vacuum lines
• OEM-style fit and function
• Durable construction for long-term reliability
Function and Purpose
This Y-piece is a critical connector within the vacuum system.
It helps to:
• Split a single vacuum line into two outputs
• Maintain proper vacuum routing
• Ensure consistent vacuum pressure distribution
• Support engine and HVAC system operation
Why Replace Your Vacuum Connector
Over time, vacuum connectors can degrade due to heat and age.
Common issues include:
• Cracked or brittle plastic
• Vacuum leaks
• Poor hose connections
• Engine or HVAC system malfunctions
Replacing the Y-piece restores proper vacuum system function.
• Loose or unsecured temperature sensor
• Incorrect temperature readings
• HVAC system inconsistencies
• Broken or missing connector clips
Replacing the lock piece restores proper sensor stability and function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857372702
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- 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
- 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
- Porsche 928S2 4.7L 1984-86
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 928 - 1978 to 1995
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92757458703
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
- 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
Fits:
Porsche 928 1978-84
Diagram ref. 4.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857456704
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
Porsche Heater Hoses & Pipes | Reliable Coolant Flow & Cabin Heating Efficiency
Heater hoses and pipes are essential components in your Porsche’s heating and cooling system. They carry heated coolant from the engine to the heater core, enabling warm air circulation throughout the cabin. Without properly functioning hoses and pipes, the heating system cannot deliver consistent temperature control or maintain efficient engine cooling.
At Design911, we supply premium heater hoses and coolant pipes that meet or exceed original engineering standards. Constructed from high-quality rubber, aluminium, or reinforced composite materials, these components ensure leak-free performance, excellent heat resistance, and long-term durability.
Whether you’re restoring a classic 911 or maintaining a modern Porsche with advanced climate control systems, our heater hoses and pipes provide the precision, fitment, and performance required for dependable heating and cooling.
What Do Heater Hoses & Pipes Do?
Heater hoses and pipes form the circulation path that carries hot coolant from the engine to the heater core, allowing the HVAC system to provide warm air inside the cabin.
Core Functions:
- Transfer heated coolant to the heater core for cabin warming.
- Maintain proper coolant flow between engine and heating system.
- Regulate temperature and prevent air pockets in the system.
- Ensure efficient heat exchange for passenger comfort.
- Protect against coolant loss and overheating.
A properly functioning set of hoses and pipes is critical for both engine cooling performance and interior heating efficiency.
Why Do Heater Hoses & Pipes Fail or Degrade?
These components endure constant heat, pressure, and vibration. Over time, material fatigue and corrosion can lead to leaks or blockages.
Common Causes of Failure Include:
- Age-related cracking, swelling, or brittleness of rubber hoses.
- Corrosion or pinhole leaks in metal pipes.
- Coolant contamination or chemical degradation.
- Loose or damaged hose clamps causing leaks.
- Blockages from scale or debris restricting coolant flow.
When heater hoses or pipes fail, symptoms include coolant leaks, weak cabin heat, overheating, or a sweet smell of antifreeze inside the cabin.
Why Replace Your Porsche Heater Hoses & Pipes?
Replacing worn or damaged heater hoses and pipes restores proper coolant circulation, prevents leaks, and ensures stable heating and engine temperature control.
Key Benefits:
- Restores efficient coolant flow and cabin heating performance.
- Prevents leaks, overheating, and engine damage.
- Improves reliability and system pressure integrity.
- Resistant to heat, pressure, and corrosion for long lifespan.
- Direct-fit replacements for Porsche 911, Cayman, Boxster, Panamera, Macan, and Cayenne models.
- Ideal for maintenance, restorations, or performance upgrades.
It’s recommended to replace heater hoses and clamps during coolant service intervals to maintain maximum system reliability.
Highlights
- Precision-engineered Porsche heater hoses and coolant pipes.
- Constructed from high-quality, heat-resistant materials.
- Direct-fit replacements for Porsche models old and new.
- Designed for long-term resistance to pressure and corrosion.
- Ensures reliable heating and engine cooling performance.
- Ideal for restoration, servicing, and preventative maintenance.
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Saturday: Closed
Sunday: Closed