MiMi Auto Parts
EXPANSION TANK WITH LOWER PIPE, Moca

EXPANSION TANK WITH LOWER PIPE

Brand: Moca

SKU: 403559

Category: COOLING, WATER BOTTLE

R1 090,20 incl. 15% VAT

✓ In stock, ships nationwide via The Courier Guy

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Fitment: Fits selected BMW models. Confirm exact fitment before ordering.

Product Description

This Moca expansion tank with lower pipe is a crucial component in your BMW's cooling system, designed to store excess coolant and help regulate engine temperature. The integrated lower pipe ensures efficient coolant flow between the tank and the rest of the cooling system, supporting optimal engine performance. This part is specifically intended for BMW models that require a separate expansion tank with a lower pipe attachment, commonly found in certain E46, E83, and E53 series vehicles.

Fitment is for select BMW vehicles, but it is essential to confirm your exact model, year, engine size, and engine code before ordering to ensure correct compatibility. If your BMW's original expansion tank is cracked, leaking, or showing signs of wear, this replacement unit restores your cooling system's reliability.

Common symptoms of a failing expansion tank include coolant leaks under the car, low coolant warnings, overheating, visible cracks in the tank, or unexplained coolant loss. You may also notice steam from the engine bay or persistent coolant odours, both of which indicate cooling system issues.

Replacing a damaged or leaking expansion tank is vital to prevent engine overheating and potential costly repairs. Ensure all hose connections and the lower pipe are secure during installation, and always top up with the correct coolant after replacement.

Order with confidence from MiMi Auto Parts. We offer nationwide delivery across South Africa and are committed to supplying the right cooling water bottle parts for your BMW. Always verify fitment details before purchasing to avoid returns or installation issues.

Common signs this part may need replacement

  • Coolant leaking beneath the vehicle
  • Low coolant warning light
  • Engine overheating
  • Visible cracks or swelling on the tank
  • Unexplained coolant loss
  • Steam or vapour from engine bay
  • Coolant odour around the engine
  • Frequent need to top up coolant
  • Pressure build-up in the cooling system
  • Coolant stains around the expansion tank area

Typical replacement guidance

Replace the expansion tank if you notice leaks, cracks, or coolant loss, as these can quickly lead to overheating and engine damage. It is recommended to inspect the tank and lower pipe during routine maintenance, especially if your BMW is experiencing cooling system issues.

Why timely replacement matters

Timely replacement of a faulty expansion tank prevents engine overheating and potential head gasket failure. It also helps maintain correct coolant levels and system pressure for reliable engine operation.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

  • BMW 3 (E46) 1997 – 2005 318 i (N42 B20 A|N46 B20 A|N46 B20 C) – 105 kW / 143 HP
  • BMW 3 (E46) 1997 – 2005 320 d (M47 D20 (204D1)) – 100 kW / 136 HP
  • BMW 3 (E46) 1997 – 2005 320 i (M52 B20 (206S4)) – 110 kW / 150 HP
  • BMW 3 (E46) 1997 – 2005 320 i (M54 B22 (226S1)) – 125 kW / 170 HP
  • BMW 3 (E46) 1997 – 2005 323 i (M52 B25 (256S4)) – 125 kW / 170 HP
  • BMW 3 (E46) 1997 – 2005 325 i (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW 3 (E46) 1997 – 2005 328 i (M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW 3 (E46) 1997 – 2005 330 i (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW 3 Compact (E46) 2001 – 2004 318 ti (N42 B20 A|N46 B20 A) – 105 kW / 143 HP
  • BMW 3 Compact (E46) 2001 – 2004 325 ti (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW 3 Convertible (E46) 2000 – 2007 318 Ci (N42 B20 A|N46 B20 A) – 105 kW / 143 HP
  • BMW 3 Convertible (E46) 2000 – 2007 323 Ci (M52 B25 (256S4)) – 125 kW / 170 HP
  • BMW 3 Convertible (E46) 2000 – 2007 325 Ci (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW 3 Convertible (E46) 2000 – 2007 330 Ci (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW 3 Coupe (E46) 1998 – 2006 318 Ci (N42 B20 A) – 105 kW / 143 HP
  • BMW 3 Coupe (E46) 1998 – 2006 323 Ci (M52 B25 (256S4)) – 125 kW / 170 HP
  • BMW 3 Coupe (E46) 1998 – 2006 325 Ci (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW 3 Coupe (E46) 1998 – 2006 328 Ci (M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW 3 Coupe (E46) 1998 – 2006 330 Ci (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW 3 Touring (E46) 1999 – 2005 318 i (N42 B20 A|N46 B20 A|N46 B20 C) – 105 kW / 143 HP
  • BMW 3 Touring (E46) 1999 – 2005 320 d (M47 D20 (204D1)) – 100 kW / 136 HP
  • BMW 3 Touring (E46) 1999 – 2005 320 i (M52 B20 (206S4)) – 110 kW / 150 HP
  • BMW 3 Touring (E46) 1999 – 2005 320 i (M54 B22 (226S1)) – 125 kW / 170 HP
  • BMW 3 Touring (E46) 1999 – 2005 325 i (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW 3 Touring (E46) 1999 – 2005 328 i (M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW 3 Touring (E46) 1999 – 2005 330 i (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW X3 (E83) 2003 – 2011 2.5 i (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW X3 (E83) 2003 – 2011 2.5 si (N52 B25 A|N52 B25 AF|N52 B25 BF) – 160 kW / 218 HP
  • BMW X3 (E83) 2003 – 2011 3.0 i xDrive (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW X3 (E83) 2003 – 2011 3.0 si (N52 B30 A|N52 B30 BF) – 200 kW / 272 HP
  • BMW X5 (E53) 2000 – 2006 3.0 i (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW Z4 Coupe (E86) 2006 – 2008 3.0 si (N52 B30 A|N52 B30 BF) – 195 kW / 265 HP
  • BMW Z4 Roadster (E85) 2002 – 2009 2.0 i (N46 B20 B) – 110 kW / 150 HP
  • BMW Z4 Roadster (E85) 2002 – 2009 2.5 i (M54 B25 (256S5)) – 141 kW / 192 HP
  • BMW Z4 Roadster (E85) 2002 – 2009 2.5 si (N52 B25 A) – 160 kW / 218 HP
  • BMW Z4 Roadster (E85) 2002 – 2009 3.0 i (M54 B30 (306S3)) – 170 kW / 231 HP
  • BMW Z4 Roadster (E85) 2002 – 2009 3.0 si (N52 B30 A|N52 B30 BF) – 195 kW / 265 HP

Fitment support

Not sure if this part fits your vehicle? Contact MiMi Auto Parts with your vehicle make, model, year, and engine code before ordering and we will help confirm fitment.

Installation note

Cooling system work involves draining and refilling coolant and may require specialised tools. Professional installation is recommended to ensure correct coolant mixture, bleeding of air from the system, and leak-free connections.

Frequently Asked Questions

What are the signs of a failing water pump?

Common signs may include coolant leaks near the front of the engine, engine overheating, a whining or grinding noise from the water pump area, or coolant loss without visible external leaks. Diagnosis should be confirmed before replacement.

Can I drive with a coolant leak?

Driving with a coolant leak is not recommended. Loss of coolant can lead to engine overheating and potentially serious engine damage. The vehicle should be inspected and the leak repaired before further driving.

Does this part fit my vehicle?

Please check the vehicle compatibility section on this page and confirm your vehicle make, model, year, engine size, and engine code before ordering. If you are unsure, contact MiMi Auto Parts before checkout.

Is the price VAT-inclusive?

Yes, product prices on MiMi Auto Parts are shown inclusive of VAT where applicable.

Do you deliver across South Africa?

Yes, MiMi Auto Parts delivers nationwide in South Africa. Delivery cost and estimated timing are calculated during checkout based on your location.

Is professional installation recommended?

Professional installation is recommended for safety-critical and technical parts such as airbag, clock spring, brakes, suspension, steering, clutch, cooling, engine, and electrical components. For guidance specific to this part, see the installation note on this page.

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