What is the design and purpose of expansion tanks?

Expansion tanks are cooling system components mounted in the engine bay, connected to the coolant circuit. A typical element consists of a plastic body, connection ports, a pressure cap, and sometimes a level sensor. Their purpose is to take in excess fluid during temperature rises and maintain proper operating conditions for the entire system.

What are expansion tanks used for?

Expansion tanks are used to stabilize the level and volume of coolant during engine heating and cooling. Thanks to them, the cooling system can operate under the correct pressure, and the driver has easy access to check the fluid level. Damage to this element can lead to leaks, air in the circuit, and problems with maintaining engine operating temperature.

What role does the expansion tank pressure cap play?

The pressure cap is the part that closes the tank and controls the pressure in the cooling system. It serves to maintain the correct fluid operating parameters and to safely discharge excess pressure when the system temperature rises. Its design includes a seal and a valve, so when selecting, it is worth checking compatibility with the specific OEM number and tank neck type.

How to choose an expansion tank for a specific car?

The safest way is to compare the OEM part number, port layout, mounting points, and additional equipment, such as the presence of a level sensor. The engine version, fuel type, and mounting location in the engine bay are also important. For used parts, it is also worth verifying the condition of the cap thread and the tightness of the body.

What symptoms indicate a problem with the expansion tank?

The most common symptoms are a drop in coolant level, visible signs of leakage, cracks in the housing, and fogging or traces of sediment around the cap and ports. In some cars, a message related to the fluid level or unstable engine operating temperature also appears. These symptoms should be evaluated together with the condition of the hoses, cap, and adjacent connections.

What to pay attention to when installing an expansion tank?

Before installation, check the cleanliness of the hoses, the condition of the clamps, and the correct seating of the tank in the brackets. It is important to properly connect all ports and use the correct cap, as even a small leak affects the system pressure. After installation, it is worth checking the fluid level and observing the system operation after reaching operating temperature.

Expansion & Overflow Tanks

At the Global Parts automotive store, we offer a wide selection of original used car parts, including expansion tanks for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen and others. The expansion tanks we offer undergo quality control so that you can be sure that you are receiving a top-class product.

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Ford Mondeo Mk3 Coolant Tank With Sensor 2.0 TDCI 6G91-8K218-D2L4A

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. DS78-8C045-AE

Ford Mondeo Mk5 Coolant Overflow Radiator Tank Reservoir Bottle DS78-8C045-AE

€42.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8K0121405F

Audi A4 S4 8K A5 S5 8F 8T Radiator Expansion Tank Coolant Reservoir 8K0121405F

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4H0121403G

Audi A8L 4H 3.0 TDI CDTA Coolant Overflow Reservoir Expansion Tank 4H0121403G

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7H0121407

VW Volkswagen Transporter T5 Coolant Expansion Overflow Tank Bottle 7H0121407C

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 3Q0121407A

Volkswagen Tiguan AD1 Coolant Expansion Tank Bottle Reservoir 2.0 TDI 3Q0121407A

€32.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1104120

Ford Transit Connect Mk1 Coolant Expansion Tank Reservoir Bottle 98AB-8K218-AK

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. T2H19682

Jaguar Xf X260 F-Pace Header Expansion Overflow Coolant Tank GX73-8A080-AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4G0121214AF

Audi A6 C7 Radiator Coolant Reservoir Bracket Mount Lower Front 4G0121214AF

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4G0121214AE

Audi A6 C7 Radiator Coolant Reservoir Bracket Mount Upper Front 4G0121214AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7810592-3

BMW E81 E87 E90 E91 E92 Coolant Expansion Tank Reservoir Diesel 7810592

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A2742000385

Mercedes W205 W213 M274 Coolant Reservoir Expansion Tank Petrol A2742000385

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1717053

Ford Focus Mk3 Radiator Expansion Overflow Reservoir Tank Bottle 8V61-8K218-AE

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 3M5H-8K218-AJ

Ford Kuga Mk1 Focus Mk2 Coolant Expansion Tank Overflow Bottle 3M5H-8K218-AJ

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A2602001300

Mercedes W177 Coolant Overflow Expansion Tank Bottle Petrol A2602001300

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A1405001749

Mercedes C140 Coolant Expansion Tank Reservoir A1405001749

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. EB3G-8K218-AC

Ford Ranger Mk3 Expansion Header Overflow Bottle Tank Reservoir EB3G-8K218-AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 5Q0121407A

Audi A3 8V Engine Coolant Water Expansion Tank Bottle 5Q0121407A

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8W0121405F

Audi A5 F5 Expansion Coolant Tank Bottle 8W0121405F

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1J0121403B

Audi TT 8N Coolant Expansion Header Tank Bottle Reservoir Cap 1J0121403B

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7647283-1

BMW F01 F10 F11 F12 Coolant Tank Bottle Radiator Expansion 7601949

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8V61-8K218-AE

Ford Focus Mk3 Radiator Expansion Overflow Reservoir Tank Bottle 8V61-8K218-AE

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8K0121403G

Audi A4 B8 A5 8T Q5 2.0TDI Coolant Reservoir Expansion Tank Bottle 8K0121403G

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4K2121214E

Audi A6 C8 Radiator Expansion Tank Reservoir Retainer Bracket Support 4K2121214E

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. GX73-8A080-AC

Range Rover Velar L560 Coolant Expansion Tank Reservoir Bottle GX73-8A080-AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. PCJ500030

Range Rover Evoque L551 Expansion Overflow Coolant Tank Level Sensor PCJ500030

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7P0121407

Porsche Cayenne 92A Coolant Liquid Overflow Tank Reservoir 7P0121407

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 99657392901

Porsche Cayman 987 Carrera 996 Air Conditioning Expansion Valve 99657392901

€32.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4G0121403AH

Audi A6 C7 A7 4G Water Coolant Expansion Tank Reservoir 3.0 TDI 4G0121403AH

€42.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 2248409

BMW E46 X3 E83 Z4 E85 Cooling Water Connector Pipe Radiator 2248409

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A2515000049

Mercedes W251 Engine Coolant Water Expansion Tank Bottle A2515000049

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 6G91-8K218-FA

Ford Mondeo Mk4 Coolant Expansion Tank Reservoir 2.2 TDCi 6G91-8K218-FA

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 6C118K218AC

Ford Transit MK7 Coolant Expansion Overflow Tank Fluid Bottle 6C118K218AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7578663

BMW F01 F02 F03 Expansion Tank Filler Neck Tube 7578663

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8T168K218AB

Expansion Tank Ford Transit Connect Coolant Reservoir Bottle 8T168K218AB

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7553919-2

BMW E60 X5 E70 X3 E83 E87 E90 E91 F10 Coolant Tank Level Switch Sensor 7546548

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 6C0121407

Audi A1 8X 1.6 TDI Expansion Tank Water Coolant Bottle Reservoir 6C0121407

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1301104

Ford Transit Mk7 Radiator Water Coolant Expansion Cap Trim Tank 1301104

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 2Q0121407B

Audi A1 GB VW Polo Taigo Coolant Expansion Tank Bottle Reservoir 2Q0121407B

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4548391

Ford Transit MK6 Coolant Expansion Tank Bottle Reservoir YC15-8A080-AE

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 2Q0121407

Audi A1 GB Coolant Header Expansion Tank Reservoir Bottle 2Q0121407

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4K0121405N

Audi A6 C8 Coolant Expansion Reservoir D Cooling Agent Tank Radiator 4K0121403

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7T16-3A530-A

Ford Transit Connect Mk1 Coolant Tank Bracket Carrier Mount Holder 7T16-3A530-A

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7430854

BMW G32 GT Expansion Tank Water Coolant Bottle Reservoir Wash Container 7430854

€56.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7E0121407D

VW Transporter T6 Coolant Liquid Overflow Tank Reservoir 2.0 Diesel 7E0121407D

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8K0121405H

Audi A4 S4 B8 A5 8T Coolant Expansion Tank Overflow Reservoir 8K0121405H

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7542986

BMW E60 E61 E63 E64 LCI Cooling Water Expansion Tank Petrol 7521189

€32.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. BK21-8K218-AG

Ford Transit Custom Expansion Tank Coolant Header Tank 2.2 TDCI BK21-8K218-AG

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 982121133D

Porsche 718 Boxster Cayman 982 Coolant Expansion Tank Filler Neck 982121133D

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8V618K218DE

Ford Transit Connect Water Coolant Reservoir Bottle Cap Tank 8V61-8K218-DE

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 5031507

Ford Ranger Mk4 Coolant Header Expansion Tank Reservoir 5031507 XM34-8A080-AE

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. K8D2-8K218-AB

Range Rover Evoque L551 Expansion Tank Bottle Reservoir 2.0 Diesel K8D2-8K218-AB

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7788293

BMW E60 E61 E64 LCI Cooling Water Expansion Tank Mount Bracket Support 7788293

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 2248409-1

Cooling Water Connector BMW X3 Z4 E46 E83 E85 Pipe Radiator 2248409

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1722875

Ford Ranger Mk6 Coolant Expansion Header Tank Radiator Bottle AB39-8K218-AA

€28.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1K012107A

Skoda Octavia Mk2 Vrs Estate Coolant Reservoir Expansion Tank Bottle 1K0121407A

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7607482-1

BMW X1 E84 E81 E87 E90 Coolant Expansion Tank Bottle Reservoir Petrol 7607482

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 4R83-8A080-AC

Jaguar XF X250 Coolant Expansion Tank Reservoir Bottle 2.7 Diesel 4R83-8A080-AC

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7H0121407C

VW Transporter T5 Coolant Cooling Water Expansion Tank Bottle 7H0121407C

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A1332000285

Mercedes C117 W176 Water Coolant Expansion Tank Reservoir M133 A1332000285

€32.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 9327150-1

BMW i3 I01 Hybrid Electric Expansion Coolant Tank Radiator Fluid Bottle 9327150

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 217100015R

Expansion Tank Renault Trafic Opel Vivaro Coolant Reservoir Bottle 217100015R

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 6851332

BMW E46 X5 E53 X3 E83 E60 E61 E65 E81 E87 E90 E91 Expansion Tank Power Steering Cap

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 9684527680

Citroen DS5 Coolant Overflow Expansion Reservoir Bottle Tank 9684527680

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 3M5H-8100-AD

Ford Transit Mk7 Cooling Fluid Bottle Reservoir Cap 8V218K218

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. AH22-8A080-AB

Range Rover Sport L320 Radiator Coolant Overflow Tank Reservoir AH22-8A080-AB

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 1K0121407A

Audi A3 8P Expansion Tank Header Coolant Reservoir Bottle 1K0121407A

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 5A1BD89

Mini F55 F56 F60 Radiator Expansion Tank Coolant Bottle Cap Cover Screw 5A1BD89

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 6C0121407-1

Audi A1 8X VW Polo Mk5 Expansion Tank Water Coolant Bottle Reservoir 6C0121407

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. GN11-8A080-AA

Ford Fiesta Mk8 Puma Mk2 Coolant Expansion Tank Header GN11-8A080-AA

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7529274

BMW Mini Cooper S R52 R53 Coolant Cooling Water Expansion Tank Bottle 7529274

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. PZ31-8A080-AB

Ford Transit Custom Mk2 Coolant Expansion Tank Bottle 2.0 EcoBlue PZ31-8A080-AB

€37.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. FK72-8K012-AA

Land Rover Discovery Sport L550 Overflow Reservoir Hose Pipe Line FK72-8K012-AA

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. GN11-8A080-CB

Ford Fiesta Mk8 Puma Mk2 Coolant Expansion Tank Header GN11-8A080-CB

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. HK62-8A080-AB

Range Rover Sport L494 Coolant Reservoir Expansion Tank HK62-8A080-AB

€37.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 5Q0121407D-1

Audi A3 8V Expansion Tank Header Coolant Reservoir Bottle 5Q0121407D

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A1715000049

Mercedes SLK R171 Coolant Expansion Overflow Tank Fluid Bottle A1715000049

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7639024-1

Mini Cooper One R55 R56 R57 R59 R60 R61 F55 F56 Cover Lid Expansion Tank

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. HPLA-5B709-AA

Range Rover Sport L494 Air Suspension Tank Reservoir Air Tube HPLA-5B709-AA

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 7806038

BMW F10 F11 F12 F13 LCI Expansion Tank Coolant Radiator Bottle Diesel 7806038

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. A4535010100

Smart 453 Fortwo Radiator Coolant Expansion Tank Reservoir A4535000149

€32.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8605551

BMW F40 X1 F48 X2 F39 Coolant Mount Radiator Centering Pin Set M6X13,6 8605551

€23.95

Free delivery: Nov 12 – 13

If paid before 14:00

Part no. 8570079

BMW E81 E87 E90 E92 Expansion Tank Bottle Coolant Radiator Tank Diesel 8570079

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Part no. 7823544

Radiator Expansion Tank BMW X3 F25 X4 F26 Overflow Tank Bottle 7823544

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Part no. A6395010503

Expansion Tank Mercedes W639 Coolant Reservoir Bottle A6395010503

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BMW E46 X5 E53 X3 E83 Coolant Expansion Tank Radiator Header Reservoir 7573781

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Part no. 8K0121403Q

Audi A4 B8 8K A5 8T Water Coolant Expansion Reservoir Tank 8K0121403Q

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Expansion Tank BMW F20 F21 F30 F32 Radiator Coolant Bottle Petrol 7642158

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Part no. A2465000049

Mercedes W176 W246 Coolant Expansion Tank Reservoir Bottle A2465000049

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BMW F20 F21 F30 F32 Radiator Expansion Overflow Reservoir Tank Bottle 7642160

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Part no. A2475000049

Mercedes W177 W247 Coolant Overflow Expansion Tank Bottle A2475000049

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Part no. A9105010400

Expansion Tank Mercedes W907 W910 Coolant Overflow Fluid Bottle A9105010400

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Part no. 1438819

BMW X5 Series E53 Coolant Expansion Water Tank Mounting Fits Radiator 1438819

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Part no. A6395011420

Mercedes-Benz Vito W639 Coolant Expansion Tank Holder Bracket A6395011420

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Mercedes W205 W213 C238 Coolant Reservoir Expansion Tank A2055000049

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Part no. 7L0121407E

Volkswagen Touareg 7L Expansion Tank Header Coolant Reservoir Bottle 7L0121407E

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Radiator Expansion Tank BMW F20 F21 F30 F32 3 Bottle Petrol 7642158

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BMW 3 Z4 Series E46 E85 E86 Connection Pipe Radiator Bracket Mounting Plate

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Volkswagen VW Caddy 2K Power Steering Fluid Expansion Tank Reservoir 2K0422371A

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