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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Mercedes W245 Coolant Expansion Tank Bottle A0005840807

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Part no. A6395010503-1

Mercedes W639 Coolant Expansion Tank Reservoir Bottle A6395010503

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Ford Fiesta MK7 Expansion Tank Cooling Fluid Bottle Reservoir 8V218K218

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

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Part no. 4G0121403D

Audi A6 C7 Expansion Tank Header Coolant Reservoir Bottle 4G0121403D

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Part no. 7L0121407E

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

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Part no. 8K0121405M

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

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Part no. 8K0121405N

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

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Part no. 4E0121403H

Audi S8 D3 Coolant Expansion Tank Reservoir Bottle Fluid Tank 4E0121403H

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Mercedes W205 Radiator Expansion Overflow Reservoir Tank Bottle A2055000549

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Hyundai H-1 Expansion Tank Coolant Reservoir Bottle 254304H000

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Audi Q5 FY Expansion Tank Header Coolant Reservoir Bottle 80A121405T

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Mercedes SLK R171 Coolant Expansion Overflow Tank Fluid Bottle A1715000049

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Part no. 7529273-1

Mini R52 R53 Coolant Cooling Water Expansion Tank Bottle 7529273 MAHLE

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Audi A3 8V Coolant Expansion Tank Water Header Bottle Reservoir 8V0121407A

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Part no. 8V0121407A

Audi A3 8V Coolant Expansion Tank Water Header Bottle Reservoir 8V0121407A

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Part no. PCF500015

Land Rover Discovery 3 L319 Coolant Overflow Reservoir Tank Bottle PCF500015

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Part no. 7823544-2

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

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Mercedes-Benz M-Class ML W163 Coolant Expansion Tank Bottle A1635000349

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BMW 1 3 Series E87 E90 E91 E92 Coolant Expansion Tank Bottle Petrol 7640514

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Part no. 7542986-1

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

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Part no. A1645000049-1

Expansion Tank Mercedes W164 Coolant Reservoir Cap Bottle A1645000049

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Volkswagen VW Crafter Coolant Expansion Tank Balancing Tank A9065010103

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Mercedes W124 E280 Petrol M103.940 Expansion Coolant Tank A1245000849

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

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Part no. 5WA121407F

Volkswagen Golf VI Coolant Expansion Tank Reservoir Bottle Fluid Tank 5WA121407F

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Part no. 8V0121407

Audi RS4 B8 Header Coolant Expansion Overflow Reservoir Tank Bottle 8V0121407

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Part no. 7642158

BMW 1 3 4 Series F20 F21 F30 F32 Radiator Expansion Tank Bottle Petrol 7642158

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Part no. a1245001349

Mercedes W124 Expansion Tank Coolant Reservoir Bottle A1245001349

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Part no. 2D0121403K

Volkswagen LT 35 Coolant Expansion Tank Coolant Overflow Reservoir 2D0121403K

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Part no. A2513200015

Mercedes W251 Air Suspension Tank Reservoir A2513200015

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Part no. A2115000049-1

Expansion Tank Mercedes W211 CLS C219 Coolant Overflow Bottle A2115000049

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Part no. 8089488

BMW F87 LCI M2 Competition Expansion Tank Reservoir Bottle 8089488

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Part no. 7647283-1

BMW F01 F10 F11 F12 Coolant Tank Bottle Radiator Expansion 7601949

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

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Part no. 7L0121407F

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

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Vespa GT200 Coolant Expansion Tank Reservoir Bottle Tank 577402

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

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Expansion Tank BMW i3 I01 Hybrid Electric Radiator Bottle Petrol 9327150

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Expansion Tank BMW i3 I01 Hybrid Electric Radiator Bottle Petrol 9327150

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Part no. 7787039

Coolant Reservoir BMW E46 X5 E53 X3 E83 Cooling Water Expansion Tank Bottle

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Mercedes W639 Coolant Expansion Tank Reservoir Bottle A6395010203

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Mini R52 R53 Coolant Cooling Water Expansion Tank Bottle 7529273

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BMW G30 Coolant Expansion Bootle Tank Water 9846642

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

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Expansion Tank BMW G11 G12 G30 G31 G32 Coolant Overflow Reservoir Bottle 8610655

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Mercedes W212 M271 Dashpot Shock Absorber Container Expansion Bottle A2124700216

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Part no. A1685000249-1

Mercedes W168 Coolant Expansion Tank Cooling Fluid Bottle Tank A1685000249

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

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Part no. 1352905

Ford Transit Connect Servo Brake Fluid Expansion Tank Bottle Reservoir 1352905

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Citroen Berlingo Servo Brake Fluid Expansion Tank Bottle Reservoir 4635C3

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Porsche Cayman 987 Coolant Expansion Tank Reservoir Cap Screw 98710604702

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Expansion Tank Renault Trafic Opel Vivaro Coolant Reservoir Bottle 7700312900

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Peugeot 207 Coolant Expansion Overflow Tank Cooling Fluid Bottle 9652621280

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Mercedes-Benz W202 W208 Coolant Expansion Tank Reservoir Bottle A2025000649

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BMW G20 G21 Radiator Coolant Expansion Overflow Tank Reservoir Bottle 8610652

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Part no. CANTONSTANTR53

Mini R53 Canton Coolant Expansion Header Tank Alloy Water Bottle Cooper S W11

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Citroen Berlingo B9 Coolant Expansion Tank Cooling Fluid Bottle 9671568380

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

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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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Volkswagen VW Transporter T5 Power Steering Fluid Expansion Tank Bottle

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Peugeot 307 Coolant Expansion Tank Cooling Fluid Bottle Reservoir 9646903180

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Porsche Cayman 987C Coolant Expansion Tank Reservoir Bottle Overflow 98710604702

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Mercedes W221 Coolant Expansion Tank Reservoir Bottle Fluid Tank A2215000349

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