VW TRANSPORTER T5 SHUTTLE 2.5TDI ENGINE WATER COOLANT PIPE HOSE 7H0122157H

#60

Genuine used Volkswagen Transporter T5 / Caravelle / Shuttle 2.5 TDI engine coolant water pipe / hose, part number 7H0122157H.

This factory coolant hose forms part of the engine cooling circuit and carries engine coolant between components of the cooling system. It is designed to withstand the temperature, pressure and vibration generated during normal engine operation.

Part Number: 7H0122157H

VW OE Number: 7H0 122 157 H

Part Type: Engine Coolant Hose / Water Pipe / Cooling System Hose

System: Engine Cooling System

Engine: 2.5 TDI – selected applications

Fuel Type: Diesel

Manufacturer: Volkswagen / VAG

Condition: Genuine used part

Compatibility

Suitable for selected:

* Volkswagen Transporter T5 – 2003–2009

* Volkswagen Caravelle T5 – 2003–2009

* Volkswagen Multivan T5 – selected versions

* Volkswagen Shuttle T5

* Volkswagen California T5 – selected versions

* Transporter Panel Van

* Kombi

* Passenger / Bus versions

* Selected chassis cab versions

Confirmed 2.5 TDI applications include:

* AXD – 2.5 TDI, 96 kW / 130 PS

* BNZ – 2.5 TDI, 96 kW / 130 PS

* AXE – 2.5 TDI, 128 kW / 174 PS

* BPC – 2.5 TDI, 128 kW / 174 PS

Selected catalogue data also associates this hose family with other T5 engines, so 7H0122157H is not exclusive to the 2.5 TDI Shuttle.

For a used replacement, matching the OE number and physical hose configuration is strongly recommended.

Technical Information

The 7H0122157H hose forms part of the Transporter’s liquid engine-cooling circuit.

During operation, coolant circulates through the engine and associated cooling-system components to absorb excess heat.

The cooling system works together with components including:

* Engine coolant passages

* Radiator

* Thermostat

* Water pump

* Expansion tank

* Heater matrix

* Coolant hoses and pipes

* Temperature sensors

* Auxiliary cooling components where fitted

The coolant hose provides a sealed route between the relevant components and must remain capable of holding cooling-system pressure.

2.5 TDI Cooling System Information

The Transporter T5 2.5 TDI engine generates considerable heat under load, particularly during motorway driving, towing or when carrying heavy loads.

Correct coolant circulation is essential for controlling:

* Cylinder-head temperature

* Engine operating temperature

* Turbocharger-related thermal load

* Cabin heater operation

* Overall cooling-system pressure

A damaged coolant hose can allow coolant to escape rapidly and potentially cause engine overheating.

Common Reasons for Replacement

Typical reasons for replacing this hose include:

* Coolant leakage

* Split rubber hose

* Cracked connection

* Hose becoming brittle with age

* Swollen or softened rubber

* Damaged quick-release connection

* Broken retaining clip

* Damaged sealing O-ring

* Previous engine repair damage

* Hose contaminated by oil

* Chafing against surrounding components

Older coolant hoses should be inspected particularly carefully around bends and connection points.

Common Symptoms of a Coolant Hose Problem

A leaking or damaged hose may cause:

* Coolant level dropping

* Coolant warning light

* Visible coolant underneath the vehicle

* Pink/red coolant residue around connections

* Sweet coolant smell

* Steam from the engine compartment

* Poor cabin heating

* Engine temperature increasing

* Cooling system losing pressure

* Engine overheating

A small leak may only become visible when the engine reaches operating temperature and the cooling system becomes pressurised.

Important Diagnostic Information

Before replacing the hose, inspect the complete cooling system.

Check:

* Hose connections

* O-rings and seals

* Retaining clips

* Adjacent coolant hoses

* Plastic coolant flanges

* Expansion tank

* Expansion tank cap

* Radiator

* Thermostat housing

* Water pump

* Heater matrix connections

Coolant residue around a hose connection does not necessarily mean the hose itself has failed.

A damaged O-ring, retaining clip or mating connection can produce a similar leak.

Cooling System Pressure Testing

For difficult-to-locate coolant leaks, a suitable cooling-system pressure test can help identify the source.

Pressure testing can reveal:

* Small hose splits

* Leaking seals

* Damaged connections

* Cracked plastic fittings

* Radiator leaks

* Other cooling-system pressure losses

The system should only be tested according to the appropriate workshop procedure.

Hose Inspection

Before installation, inspect the replacement hose carefully for:

* Cracks

* Splits

* Hardening

* Swelling

* Soft spots

* Damaged ends

* Chafing

* Deformed connections

* Damaged retaining points

Particular attention should be paid to areas close to clamps, connectors and bends.

Installation

Before installation:

* Allow the engine to cool completely

* Release cooling-system pressure safely

* Drain coolant as required

* Compare the replacement hose with the original

* Inspect all mating connections

* Replace damaged seals/O-rings where applicable

During installation:

* Route the hose in its original position

* Avoid twisting or kinking

* Ensure connectors are fully seated

* Secure retaining clips correctly

* Keep the hose away from sharp, hot or moving components

After installation:

* Refill with the correct coolant specification

* Bleed the cooling system correctly

* Bring the engine to operating temperature

* Check for leaks

* Recheck coolant level after the system has cooled

Important Overheating Information

If this hose is being replaced following a significant coolant loss or overheating incident, the underlying cause should also be investigated.

Do not assume replacing the leaking hose alone has resolved all possible problems.

Severe overheating can potentially affect:

* Cylinder head

* Head gasket

* Cooling-system seals

* Thermostat

* Other aged coolant hoses

The engine should be monitored carefully after repair.

Programming / Coding

No programming or coding is required.

This is a mechanical engine-cooling component.

Important Compatibility Note

Please compare before ordering:

* OE number – 7H0122157H

* Engine code

* Hose shape

* Hose length

* Diameter

* Number of branches/connections

* Connector design

* Retaining clips

* Mounting/routing points

* Vehicle production date

Confirmed T5 2.5 TDI applications include AXD, AXE, BNZ and BPC, but VW used numerous different coolant hoses throughout the T5 range.

Do not purchase solely because your vehicle is a Transporter T5 2.5 TDI.

Matching 7H0122157H directly with the original hose is the safest compatibility check.

Condition

Genuine Volkswagen used engine cooling-system component.

As a used coolant hose/pipe, normal signs of previous use may include:

* Coolant residue

* Surface marks

* Dirt

* Staining

* Light cosmetic wear

* Marks around connectors and retaining clips

Please inspect all listing photographs carefully, particularly the hose body, bends, connection ends, retaining points and any plastic fittings.

Any clips, seals or additional pipework are included only if clearly shown in the listing photographs.

Any identifying colour/security markings applied to the part must remain intact in the event of a return.

Ideal genuine replacement for a split, leaking or damaged Volkswagen Transporter T5 / Shuttle / Caravelle 2.5 TDI engine coolant water hose, provided 7H0122157H matches the original component.