MiMi Auto Parts
EXPANSION TANK, Moca

EXPANSION TANK

Brand: Moca

SKU: 637003

Category: COOLING, WATER BOTTLE

R457,70 incl. 15% VAT

✓ In stock, ships nationwide via The Courier Guy

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

Product Description

This expansion tank from Moca is designed for the cooling system of select Opel vehicles. The expansion tank, also known as a cooling water bottle, acts as a reservoir for excess coolant, helping to maintain optimal pressure and temperature in your engine's cooling system. Its durable, translucent plastic construction allows for easy monitoring of coolant levels, and it features multiple hose connection points to integrate seamlessly with your Opel's cooling setup.

Fitment is specific to Opel Astra G models from 1998 to 2005, covering a range of engine sizes including 1.4, 1.6, 1.8, 2.0, 2.2 16V, and 2.0 OPC variants. Always confirm your vehicle's model, year, engine size, and engine code before ordering to ensure correct compatibility.

Common symptoms of a failing or cracked expansion tank include visible coolant leaks, frequent low coolant warnings, engine overheating, steam from under the bonnet, and a sweet smell from leaking coolant. You may also notice rapid coolant loss or air bubbles in the cooling system.

If you notice any of these signs, it is important to replace the expansion tank promptly to avoid engine overheating and potential damage. Replacement is usually straightforward, but always ensure the system is cool and depressurised before starting work.

MiMi Auto Parts offers this Moca expansion tank with nationwide delivery across South Africa. Shop with confidence and get the correct part for your Opel, backed by reliable service and expert support.

Common signs this part may need replacement

  • Coolant leaking near the tank
  • Frequent low coolant warnings
  • Engine overheating
  • Steam from under the bonnet
  • Sweet smell of coolant
  • Visible cracks or discolouration on the tank
  • Rapid coolant loss
  • Air bubbles in the cooling system
  • Coolant reservoir empty despite recent top-up

Typical replacement guidance

Replace the expansion tank if you notice leaks, cracks, or signs of deterioration, or if the tank is discoloured and brittle. Timely replacement helps prevent overheating and ensures your cooling system maintains the correct pressure and coolant levels.

Why timely replacement matters

A damaged or leaking expansion tank can lead to coolant loss and engine overheating, risking severe engine damage. Replacing this part promptly helps maintain engine reliability and prevents costly repairs.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

  • OPEL ASTRA CLASSIC G Saloon (T98) 1999 – 2006 1.6 16V (F69) (X 16 XEL|Z 16 XE) – 74 kW / 101 HP
  • OPEL ASTRA CLASSIC G Saloon (T98) 1999 – 2006 1.8 16V (F69) (X 18 XE1) – 85 kW / 116 HP
  • OPEL ASTRA CLASSIC G Saloon (T98) 1999 – 2006 1.8 16V (F69) (Z 18 XE) – 92 kW / 125 HP
  • OPEL ASTRA CLASSIC G Saloon (T98) 1999 – 2006 2.0 16V (F69) (X 20 XEV) – 100 kW / 136 HP
  • OPEL ASTRA CLASSIC G Saloon (T98) 1999 – 2006 2.2 16V (F69) (Z 22 SE) – 108 kW / 147 HP
  • OPEL ASTRA G Estate (T98) 1998 – 2009 1.8 16V (F35) (Z 18 XE) – 92 kW / 125 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 1.6 16V (F08, F48) (C 16 SEL|X 16 XEL|Z 16 XE) – 74 kW / 101 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 1.8 16V (F08, F48) (X 18 XE1) – 85 kW / 116 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 1.8 16V (F08, F48) (Z 18 XE) – 92 kW / 125 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 2.0 16V (F08, F48) (X 20 XEV) – 100 kW / 136 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 2.0 OPC (F08, F48) (Z 20 LET) – 147 kW / 200 HP
  • OPEL ASTRA G Hatchback (T98) 1998 – 2005 2.2 16V (F08, F48) (Z 22 SE) – 108 kW / 147 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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