MiMi Auto Parts
EXPANSION TANK, Moca

EXPANSION TANK

Brand: Moca

SKU: 468997

Category: COOLING, WATER BOTTLE

R752,10 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 is designed for the cooling system of select BMW models, serving as the reservoir for engine coolant. The expansion tank, also referred to as a cooling water bottle, helps manage the thermal expansion of coolant, maintaining optimal engine temperature and preventing overheating. It features an opaque plastic body, a secure threaded cap, and dual hose ports for efficient fluid management within your BMW's cooling circuit.

This part is compatible with various BMW models, including E36, E39, and Z3 variants with engines such as 2.8, 320, 323, 325, 328, 523, and 528. Always confirm your vehicle's model, year, engine size, and engine code to ensure correct fitment before ordering.

Common symptoms of a failing expansion tank include coolant leaks, low coolant warnings, overheating, visible cracks or swelling in the tank, coolant odours, and steam from under the bonnet. You may also notice fluctuating temperature readings or the need to top up coolant more frequently.

If your BMW is experiencing any of these issues, it is important to inspect and replace the expansion tank as needed. Timely replacement helps prevent engine overheating and potential damage to other cooling system components.

Order your expansion tank from MiMi Auto Parts for reliable fitment and peace of mind. We offer nationwide delivery across South Africa, making it easy to get the parts you need to keep your BMW running smoothly.

Common signs this part may need replacement

  • Coolant leaks near the expansion tank
  • Frequent low coolant level warnings
  • Overheating engine
  • Visible cracks or swelling on the tank
  • Coolant odour in the engine bay
  • Steam escaping from under the bonnet
  • Fluctuating temperature gauge readings
  • Coolant pooling beneath the vehicle
  • Air bubbles in the coolant reservoir

Typical replacement guidance

Replace the expansion tank if you notice any signs of leaks, cracks, or coolant loss. Over time, plastic tanks can become brittle and fail, especially under heat and pressure. Timely replacement helps maintain the integrity of your BMW's cooling system.

Why timely replacement matters

A faulty expansion tank can lead to coolant loss and engine overheating, risking severe engine damage. Replacing it promptly ensures consistent cooling and protects your vehicle’s engine.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

  • BMW 3 Touring (E36) 1995 – 1999 323 i (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 5 (E39) 1995 – 2003 523 i (M52 B25 (256S3)|M52 B25 (256S4)) – 125 kW / 170 HP
  • BMW 5 (E39) 1995 – 2003 528 i (M52 B28 (286S1)|M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW 5 Touring (E39) 1996 – 2004 523 i (M52 B25 (256S3)|M52 B25 (256S4)) – 125 kW / 170 HP
  • BMW 5 Touring (E39) 1996 – 2004 528 i (M52 B28 (286S1)|M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW 7 (E38) 1994 – 2001 728 i, iL (M52 B28 (286S1)|M52 B28 (286S2)) – 142 kW / 193 HP
  • BMW Z3 Roadster (E36) 1995 – 2003 2.8 i (M52 B28 (286S1)|M52 B28 (286S2)) – 142 kW / 193 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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