What is the construction and purpose of cooling system hoses and pipes?

Cooling system hoses and pipes are coolant circuit elements installed between the engine, radiator, thermostat, heater core, and expansion tank. A typical hose consists of an inner layer resistant to fluid, a reinforcing layer, and an outer cover protecting against temperature and material aging. Depending on the mounting location, it can take the form of a flexible hose or a rigid plastic or metal section.

What are cooling system hoses and pipes used for?

Cooling system hoses and pipes are used to route coolant through the entire system and maintain the proper engine operating temperature. They are responsible for connecting subassemblies, circuit tightness, and the proper transfer of fluid to the radiator, heater core, and water pump. Their failure can cause leaks, air in the system, and disruption of fluid circulation.

What is the construction and function of a cooling system connector?

A cooling system connector is a connection point to which a hose or pipe transporting coolant is attached. It can be part of the thermostat housing, radiator, cylinder head, or another subassembly and usually works with a gasket, clamp, or quick-connector. Its task is to maintain a tight and stable connection in places where pressure and temperature changes occur.

How to choose cooling system hoses and pipes for a specific car version?

It is best to compare the OEM part number, hose path, end diameters, and type of connectors. It is also worth checking the engine version, fuel type, production year, mounting location, and any interchangeable numbers. For used parts, the completeness of brackets, vents, and branches also matters.

What symptoms indicate wear of cooling system hoses and pipes?

The most common signs are coolant leaks, traces of moisture at connections, swollen material, cracks, or a hose structure that is too soft. In practice, fluctuations in engine operating temperature, gurgling, and sediment traces near clamps may also appear. Such symptoms should be checked along with fluid levels and connection tightness.

How to care for cooling system hoses and pipes after installation?

After installation, it is worth checking the hose routing, tightening of clamps, and lack of contact with hot or moving engine compartment elements. It is also important to check the coolant level and system venting after the first start. Regular inspections help to quickly detect leaks, abrasions, and material deformation.

Cooling system hoses and lines

At Global Parts, we offer a wide selection of original used car parts, including cooling system hoses and lines for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. The cooling system hoses and lines we offer are quality-controlled, ensuring you receive a top-quality product.

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Audi A3 8P VW Golf Mk6 2.0 TDI CFFB Coolant Water Hose Pipe Line 1K0122101JQ

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Audi TT Mk2 8J Water Coolant Pipe Hose Line 2.0 TFSI 3C0122073EG

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Audi A4 B9 A5 F5 Water Coolant Radiator Pipe Hose Line 3.0 TDI 8W0122055BD

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Audi A4 B6 4.2 Petrol Coolant Pipe Cooler Water Hose 079121065M

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Audi A3 8P Engine Water Coolant Pipe Hose Line 1.9 TDI 3C0121157AA

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Audi A4 S4 B8 S5 8T A6 C7 Coolant Pipe Hose Tube Line 06E121044L

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Audi A7 4G 4.0 TFSI Coolant Hose Engine Water Pipe Front Left N/S 079121083H

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Audi A4 B8 A5 8T 3.0 TDI Rear Coolant Water Breather Pipe Line Hose 8K0121081BG

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Audi Q7 4L 4.2 TDI Coolant Hose Pipe Hose Line 057121073C

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Audi A3 8P 2.0 TDI Water Hose Radiator Coolant Pipe Line 3C0122101EN

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Audi A4 S4 B8 Water Hose Radiator Coolant Pipe Line Tube 3.0 TFSI 06E121045BD

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Audi A6 C8 Water Hose Coolant Cooling Pipe Line 4K0122055T

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Audi A3 RS3 8V 8Y Water Coolant Hose Pipe Hose Line 2.5 TFSI 8V0121109

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Audi S3 8P 2.0 TFSI CDLA Coolant Flange Pipe Hose Line 06F121132G

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Audi A3 8P Water Hose Cooling Radiator Coolant Pipe Line 5N0121070M

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Part no. 8E0819376C

Audi RS4 B7 Engine Water Coolant Pipe Hose Line 4.2 V8 BNS 8E0819376C

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Part no. 8E0121055N

Audi A4 B7 1.9 TDI Water Pipe Engine Cooling Radiator Coolant Hose 8E0121055N

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Part no. 5Q0121070BR-2

Audi A3 8V 2.0 TFSI Water Hose Engine Coolant Cooling Pipe Line 5Q0121070BR

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Part no. 05L122157AS

Audi A4 B9 A5 F5 Water Cooling Coolant Pipe Hose Line 2.0 TDI 05L122157AS

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Audi A6 C7 A4 B8 A7 4G A8 D3 Coolant Hose Line Tube Pipe 06E121044M

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Part no. 06E121044L-2

Audi S5 8T A4 S4 B8 A6 C7 Water Coolant Pipe Hose Line 3.0 TFSI 06E121044L

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Part no. 05L122157CG

Audi A4 B9 A5 F5 Engine Cooling Coolant Pipe Line Hose 2.0 TDI 05L122157CG

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Part no. 8Y0121103

Audi RS3 8Y 2.5 TFSI Engine Water Cooling Pipe Hose Outer Left N/S 8Y0121103

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Part no. 8V0122157

Audi RS3 8Y 2.5 TFSI Engine Water Cooling Pipe Hose Line Tube Center 8V0122157

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Part no. 5N0122447BA

Audi Q3 8U Coolant Hose Tube Pipe Line 5N0122447BA

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Part no. 8E2819373

Audi A4 B7 1.9 TDI Water Pipe Engine Cooling Radiator Coolant Hose 8E2819373

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Part no. 059121399

Coolant Hose Audi A6 C6 A4 B7 Q7 4L Diesel Left N/S Pipe Line Tube 059121399

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Part no. 8W0145925P

Audi A4 B9 A5 F5 Water Coolant Pipe Hose 2.0 TDI 8W0145925P

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Part no. 06D121133A

Audi A4 B7 Water Coolant Engine Cooling Flange Pipe Hose Line 06D121133A

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Part no. 4G0145919AC

Water Pipe Audi A6 C7 A7 4G 2.0 TDI Hose Engine Cooling Coolant Line 4G0145919AC

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Part no. 1K0122157D

Audi A4 B7 2.0 TDI Diesel Water Hose Cooling Coolant Pipe Line 1K0122157D

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Part no. 8W0145920M

Audi A5 F5 Water Hose Cooling Radiator Coolant Pipe Line 2.0 TDI 8W0145920M

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Audi A3 8Y Quick Coupling Coolant Flange Air Intake Hose Line Petrol 06L133054

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Part no. 6R0121070L

Audi A1 8X 1.4 TSI Petrol Engine Water Hose Coolant Pipe Line 6R0121070L

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Audi S4 B8 S5 8T 3.0 TFSI CRE Supercharger Coolant Hose Pipe Line 06E121083M

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Part no. 04E122447M

Audi Q3 8U Coolant Hose Tube Line Pipe 04E122447M

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Part no. 4K0145910G

Audi A6 C8 Water Hose Coolant Cooling Pipe Line 4K0145910G

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Part no. 079121481P

Audi RS4 B8 RS5 8T Engine Cooling Pipe Line Hose 4.2 V8 Petrol 079121481P

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Part no. 059121507L

Audi Q7 4L Engine Coolant Cooling Hose Pipe Left N/S 3.0 TDI Diesel 059121507L

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Part no. 8K0819337A

Audi A4 B7 2.0 TDI BRE Diesel Water Coolant Pipe Hose Line Tube 8K0819337A

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Part no. 4G0122445L

Audi A6 C7 A7 4G Coolant Cooling Pipe Hose Line Petrol Engine 4G0122445L

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Part no. 5N0122051BG

Audi Q3 8U Coolant Hose Tube Pipe Line 5N0122051BG

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Part no. 80A819350AP

Audi Q5 FY Water Coolant Pipe Hose Line 2.0 TDI Diesel 80A819350AP

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Part no. 5N0122157BE

Audi Q3 8U Coolant Hose Tube Line Pipe Quick Release Coupling 5N0122157BE

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Part no. 4K0819334L

Audi A6 C8 Radiator Heating Line Tube Pipe Hose 4K0819334L

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Part no. 079121055AC

Audi RS4 B8 Engine Cooling Coolant Hose Pipe Line Front Left N/S 079121055AC

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Part no. 5N0122101AP

Audi Q3 8U Coolant Hose Tube Line Pipe 5N0122101AP

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Part no. 4F0121049E

Audi A4 B7 A6 C7 Engine Water Coolant Pipe Hose Line 2.0 TFSI 4F0121049E

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Part no. 079121065BR

Audi RS4 B8 RS5 8T Engine Cooling Pipe Water Coolant Hose 4.2 Petrol 079121065BR

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Audi Q3 8U Quick Release Coolant Hose Tube Line Pipe 5N0121049Q

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Audi Q7 4M Q8 Mk2 Water Coolant Hose Line Tube Pipe 3.0 Diesel 059121511CT

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Audi A6 C7 A7 4G Water Coolant Pipe Hose Line 1.8 2.0 TFSI 4G0122109AN

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Audi A3 8V Tank Crankcase Breather Vent Pipe Line 04E103474G

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Audi A5 S5 8T Oil Cooler Coolant Pipe Hose Tube Line 079121096T

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Audi TT 8N Water Coolant Hose Pipe Cooling Line 1.8T Petrol 06A121069C

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Audi RS4 B8 Engine Cooling Coolant Water Hose Pipe Line 079121036D

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Audi Q7 4L Water Coolant Pipe Hose 3.0 TDI V6 Diesel CRC 7L8121157D

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Audi A5 F5 Engine Coolant Water Pipe Hose Line 3.0 TDI Diesel Engine 059121051H

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VW Audi Seat Skoda 1.9 BXE TDI Diesel Water Hose Coolant Line 1K0121157AG

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Audi A4 B8 A5 8T A6 C7 Water Coolant Pipe Hose Line 1.8 2.0 TFSI 06L121075B

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Audi A3 8P Water Coolant Pipe Hose Tube 2.0 TDI CBAB 03L121065A

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Audi Q3 8U Water Hose Cooling Coolant Radiator Pipe Line 5N0122101T

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Audi A4 B7 Water Pipe Engine Cooling Radiator Coolant Hose 3.2 Petrol 8E0121109Q

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Audi A1 8X Water Pipe Hose Line Engine Cooling Coolant Unit Hose 03C121070M

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Audi R8 42 Engine Coolant Pipe Water Hose Cooling Line Tube 420121030A

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Audi A1 8X Water Pipe Hose Line Engine Cooling Coolant Unit Hose 03C103465AA

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Audi R8 42 Engine Coolant Pipe Water Hose Cooling Line Tube 420121082B

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Audi A4 B8 A5 8T A6 C6 Coolant Hose Line Tube Pipe 3.0 TDI 059121102C

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Audi A3 8P VW Passat 3C Touran 1T Coolant Hose Pipe Line Tube 3C0121447L

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Audi A1 8X A3 8P TT 8J VW Golf Mk5 Water Coolant Hose Pipe Line 06F121056C

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Seat Leon II VW Golf MK5 Audi A3 8P Water Hose Coolant Pipe Petrol 1K0122096J

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Audi RSQ3 F3 Engine Cooling Coolant Hose Line Tube Pipe 83A819371

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Audi A4 B8 A5 8T A5 S5 Radiator Coolant Hose Tube Line Pipe 8K0121036E

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Audi S7 4G8 Vacuum Solenoid Coolant Line Tube Hose Pipe 4.0 TFSI 079133240AH

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Audi RS4 RS5 B8 8T Engine Coolant Hose Pipe 4.2 V8 CFSA 079121036C

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Audi A6 C7 A7 4G Coolant Hose Pipe Line 3.0 TDI CVUA 4G0121448BN

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Audi A4 B8 A5 8T Q5 Radiator Coolant Hose Line Pipe Tube 8K0121056R

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Audi A6 C7 A7 4G Coolant Hose Pipe Line 3.0 TDI CVUA 4G0121448BN

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Audi A4 B9 35 TFSI DMSB Petrol Water Coolant Hose Line Tube Pipe 8W0122291AK

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Audi Q2 GA 2.0 TDI Water Hose Cooling Radiator Coolant Pipe Line 3Q0121070AG

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Audi A3 8P Water Hose Cooling Radiator Coolant Pipe Line 1.6 Petrol 06A103212A

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Audi A8 D4 Water Cooling Coolant Pipe Hose Line Tube 4.2 TDI Diesel 057121083S

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Audi A6 C6 Water Coolant Pipe Hose Line 2.0 TFSI 4F0121107AH

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Audi A3 8P Coolant Hose Water Pipe Cooling Line 1.6 Petrol 06A121065CB

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Audi A4 B9 Q7 4M Q8 Mk1 3.0 Diesel Coolant Control Regulating Valve 059121737AP

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Audi S3 TT 8N 1.8T Water Pipe Coolant Supply Metal Hose 06A121065BQ

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Audi A6 C7 A7 4G Water Radiator Coolant Pipe Hose Tube Line 3.0 TFSI 4G0121049Q

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