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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BMW 3 Series F30 LCI 330e B48X Coolant Expansion Tank Bottle 8617048

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Mercedes W124 E280 Petrol M103.940 Expansion Coolant Tank A1245000849

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Expansion Tank Citroen Relay Peugeot Boxer Coolant Fluid Bottle 1323KJ

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

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BMW F70 F74 F78 Coolant Expansion Tank Reservoir 5A5CA09

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Expansion Tank BMW i3 I01 Hybrid Electric Radiator Bottle Petrol 9327150

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Audi Q7 4L Radiator Expansion Overflow Reservoir Tank Bottle 7L0121407F

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BMW G20 G21 Radiator Coolant Expansion Overflow Tank Reservoir Bottle 8610652

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Mercedes W245 Coolant Expansion Tank Bottle A0005840807

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Expansion Tank Mercedes W164 Coolant Reservoir Cap Bottle A1645000049

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Land Rover Freelander L314 Water Coolant Expansion Tank Reservoir 3H52-8A436-AA

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BMW 3 Series E46 M54 M3 S54 Petrol Fuel Inlet Expansion Tank 2283280

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BMW F20 F21 LCI B48 B58 Coolant Expansion Tank Water Reservoir 8617045

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Volkswagen Crafter MK1 2E Power Steering Oil Tank Reservoir 2E0422371

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Mercedes W205 Radiator Expansion Overflow Reservoir Tank Bottle A2055000549

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Volkswagen Touareg 2.5 TDI Expansion Coolant Tank Bootle Reservoir 7L0121407

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

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Ford Transit Custom MK8 Coolant Expansion Overflow Tank Fluid Bottle BK218K218AG

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Hyundai H-1 Expansion Tank Coolant Reservoir Bottle 254304H000

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Mercedes-Benz A-Class W168 ABS Tank Bottle Reservoir A1682500023

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BMW F10 F12 F13 Petrol N63 Water Intercooler Coolant Expansion Tank 7647281

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Coolant Tank BMW E39 E38 Petrol M52 Expansion Coolant Reservoir Cap 1436381

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Ford Fiesta Mk7 Coolant Cooling Water Expansion Tank Bottle 8V21-8K218-BB

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AudVolkswagen Seat Skoda Expansion Tank Coolant Reservoir Bottle 5Q0121407F

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AudVolkswagen Seat Skoda Expansion Tank Coolant Reservoir Bottle 5Q0121407F

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Part no. 8687503-1

Expansion Tank BMW X1 F48 F45 Mini F55 F56 F60 Coolant Reservoir Bottle 8687503

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Part no. 7639021

BMW E60 E61 F10 F80 M3 F82 M4 Radiator Expansion Tank Cap 7639021

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Part no. 4G0121403AC

Expansion Tank Audi A6 C7 Overflow Coolant Fluid Reservoir Bottle 4G0121403G

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Citroen Berlingo Servo Brake Fluid Expansion Tank Bottle Reservoir 4635C3

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Peugeot 207 Coolant Expansion Overflow Tank Cooling Fluid Bottle 9652621280

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BMW F30 LCI 330e B48X Coolant Expansion Tank Bottle 8617047

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Part no. 8677649-1

BMW F20 F21 F30 F31 LCI Coolant Expansion Tank Petrol 8677649

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Mercedes W212 M271 Dashpot Shock Absorber Container Expansion Bottle A2124700216

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Audi A5 S5 8T Expansion Tank Header Coolant Reservoir Bottle 8K0121405N

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Part no. 7700312900

Expansion Tank Renault Trafic Opel Vivaro Coolant Reservoir Bottle 7700312900

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BMW E87 E90 E91 E92 Coolant Expansion Tank Bottle Petrol 7640514

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Mini R50 R52 R53 Brake Fluid Oil Expansion Tank Bottle 6756235

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Mercedes W176 W246 Coolant Expansion Tank Reservoir Bottle A2465000049

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Mercedes W176 W246 Coolant Expansion Tank Reservoir Bottle A2465000049

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

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Mercedes W166 Expansion Overflow Reservoir Tank Bottle A1665000049

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Mercedes W639 Coolant Expansion Tank Reservoir Bottle A6395010503

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

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BMW F01 F10 F11 F12 Coolant Tank Bottle Radiator Expansion 7601949

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BMW F30 Holder Coolant Expansion Tank Top Bracket Reservoir Mount 8619460

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Mercedes W205 W213 C238 Coolant Reservoir Expansion Tank A2055000049

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Audi A6 C7 Expansion Tank Header Coolant Reservoir Bottle 4G0121403D

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Expansion Tank Plate BMW E46 Z4 E85 E86 Radiator Bracket Mounting Trim 2248408

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Audi A4 B8 A5 8T Expansion Tank Header Coolant Reservoir Bottle 8K0121403AC

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Audi A5 8T Expansion Tank Header Coolant Reservoir Bottle 8K0121405M

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Volkswagen Transporter T5 Power Steering Fluid Expansion Tank 7H0422371A

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Mercedes W177 W247 Coolant Overflow Expansion Tank Bottle A2475000049

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Mercedes SLK R171 Coolant Expansion Overflow Tank Fluid Bottle A1715000049

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Vespa GT200 Coolant Expansion Tank Reservoir Bottle Tank 577402

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Porsche Cayman 987 Coolant Expansion Tank Reservoir Cap Screw 98710604702

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Audi Q5 FY Expansion Tank Header Coolant Reservoir Bottle 80A121405T

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Mercedes W176 W246 Coolant Hose Overflow Expansion Tank Pipe A2465010325

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Expansion Tank BMW X5 F15 E70 X6 F16 Water Coolant Overflow Reservoir 7647290

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Door Lock Renault Trafic Siliding Loading Mechanism Cable Linkage 8200904016

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Expansion Tank Renault Trafic 3 Vivaro B Coolant Reservoir Bottle 217101893R

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Expansion Tank BMW G30 G31 G11 G15 Diesel Coolant Reservoir Fluid Bottle 8610654

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Audi A4 B9 A5 F5 Expansion Tank Water Coolant Bottle Reservoir 8W0121405E

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BMW X3 E83 Radiator Expansion Tank Petrol Engine Cooling Unit E46 X5 E53 7573781

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Mini One D R50 W17 Coolant Cooling Water Expansion Tank Bottle 7788761

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Ford Transit Coolant Expansion Tank Cooling Fluid Bottle Reservoir 1383314

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Expansion Tank Mercedes W211 CLS C219 Coolant Overflow Bottle A2115000049

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Ford Transit Courier Water Coolant Expansion Tank Reservoir ET76-8K218-B

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Expansion Tank BMW E36 E38 E39 M50 M52 Petrol Cooling Water Coolant Tank 1723520

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Porsche Cayman 987C Coolant Expansion Tank Reservoir Bottle Overflow 98710604702

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Ford Kuga C394 Mk1 Water Coolant Expansion Reservoir Bottle Tank 8V61-8K218-DE

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Audi A3 8V Expansion Header Overflow Coolant Bottle Tank Reservoir 5Q0121407M

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BMW E46 X3 E83 X5 E53 Automatic Expansion Tank Radiator Header 7573781

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BMW X5 Series E53 Expansion Tank Diesel Fuel Supply 16116752034 6752034

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

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Ford Mondeo Mk4 Galaxy Mk2 Radiator Expansion Tank Overflow Bottle 6G91-8K218-AD

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Mercedes W251 Air Suspension Tank Reservoir A2513200015

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Mini R50 Coolant Expansion Tank One D W17 Water Expansion Tank Bottle 7796548

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BMW X5 E53 3.0d M57 M57N Coolant Expansion Tank Radiator 7573780

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BMW F10 M5 Expansion Tank Engine Coolant Fluid Bottle Reservoir F12 M6 2284281

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Mercedes W124 Expansion Tank Coolant Reservoir Bottle A1245001349

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Ford Fiesta Mk5 Steering Pump Oil Bottle Expansion Reservoir Tank 5S6Y-3R700-AD

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