MiMi Auto Parts
EXPANSION TANK WITH CAP, Cooltec

EXPANSION TANK WITH CAP

Brand: Cooltec

SKU: 409993

Category: COOLING, WATER BOTTLE

R779,70 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

The Cooltec Expansion Tank with Cap is a crucial component of your BMW's cooling system, designed to store excess coolant and maintain proper system pressure. This expansion tank is constructed from durable translucent plastic, allowing you to easily monitor coolant levels and detect leaks. It features an integrated cap and hose connection, ensuring a secure and leak-resistant seal.

This part is specifically suited for a range of BMW models, including E30, E36, E34, E39, and Z3 from 1982 to 2003, covering engines from 318i up to 528i. Always confirm your BMW's model, year, engine size, and engine code to ensure compatibility before ordering.

Common symptoms indicating a failing expansion tank include visible coolant leaks, low coolant warnings, overheating, fluctuating temperature gauge readings, and a sweet smell from the engine bay. Cracks or swelling in the tank, or frequent need to top up coolant, also suggest replacement is needed.

It is important to replace your expansion tank if you notice any signs of ageing, damage, or leaks. Over time, plastic tanks can become brittle and fail, risking engine overheating and costly repairs.

Order your Cooltec Expansion Tank with Cap from MiMi Auto Parts for reliable fitment and peace of mind. We offer nationwide delivery across South Africa and are always available to assist you in selecting the correct part for your vehicle.

Common signs this part may need replacement

  • Coolant leaks near the expansion tank
  • Frequent low coolant level warnings
  • Engine overheating
  • Fluctuating temperature gauge
  • Sweet smell from engine bay
  • Cracks or swelling in the tank
  • Steam from under the bonnet
  • Air bubbles in coolant reservoir
  • Coolant contamination or discolouration

Typical replacement guidance

Replace the expansion tank if you notice leaks, cracks, swelling, or persistent coolant loss. It is also advisable to replace it during major cooling system repairs or if the tank appears brittle with age.

Why timely replacement matters

A damaged or leaking expansion tank can lead to coolant loss and engine overheating, risking severe engine damage. Timely replacement ensures your BMW's cooling system maintains optimal pressure and performance.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

  • BMW 3 (E30) 1982 – 1992 318 i (M40 B18 (184E1)) – 83 kW / 113 HP
  • BMW 3 (E30) 1982 – 1992 318 i (M40 B18 (184E1)) – 85 kW / 115 HP
  • BMW 3 (E30) 1982 – 1992 318 is (M42 B18 (184S1)) – 100 kW / 136 HP
  • BMW 3 (E36) 1990 – 1998 316 i (M40 B16 (164E1)) – 73 kW / 100 HP
  • BMW 3 (E36) 1990 – 1998 318 i (M40 B18 (184E1)) – 83 kW / 113 HP
  • BMW 3 (E36) 1990 – 1998 318 i (M43 B18 (184E2)) – 85 kW / 115 HP
  • BMW 3 (E36) 1990 – 1998 318 is (M42 B18 (184S1)) – 103 kW / 140 HP
  • BMW 3 (E36) 1990 – 1998 318 is (M44 B19 (194S1)) – 103 kW / 140 HP
  • BMW 3 (E36) 1990 – 1998 320 i (M50 B20 (206S1)|M50 B20 (206S2)|M52 B20 (206S3)) – 110 kW / 150 HP
  • BMW 3 (E36) 1990 – 1998 323 i (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 3 (E36) 1990 – 1998 325 i (M50 B25 (256S1)|M50 B25 (256S2)) – 141 kW / 192 HP
  • BMW 3 (E36) 1990 – 1998 328 i (M52 B28 (286S1)) – 142 kW / 193 HP
  • BMW 3 Compact (E36) 1994 – 2000 316 g (M43 B16 (164E2)) – 75 kW / 102 HP
  • BMW 3 Compact (E36) 1994 – 2000 323 ti (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 3 Convertible (E30) 1982 – 1993 318 i (M40 B18 (184E1)) – 83 kW / 113 HP
  • BMW 3 Convertible (E30) 1982 – 1993 318 i (M42 B18 (184S1)) – 103 kW / 140 HP
  • BMW 3 Convertible (E36) 1993 – 1999 318 i (M43 B18 (184E2)) – 85 kW / 115 HP
  • BMW 3 Convertible (E36) 1993 – 1999 318 i (M44 B19 (194S1)) – 103 kW / 140 HP
  • BMW 3 Convertible (E36) 1993 – 1999 320 i (M50 B20 (206S2)|M52 B20 (206S3)) – 110 kW / 150 HP
  • BMW 3 Convertible (E36) 1993 – 1999 323 i (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 3 Convertible (E36) 1993 – 1999 325 i (M50 B25 (256S2)) – 141 kW / 192 HP
  • BMW 3 Convertible (E36) 1993 – 1999 328 i (M52 B28 (286S1)) – 142 kW / 193 HP
  • BMW 3 Coupe (E36) 1991 – 1999 318 is (M42 B18 (184S1)) – 103 kW / 140 HP
  • BMW 3 Coupe (E36) 1991 – 1999 320 i (M50 B20 (206S1)|M50 B20 (206S2)|M52 B20 (206S3)) – 110 kW / 150 HP
  • BMW 3 Coupe (E36) 1991 – 1999 323 i (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 3 Coupe (E36) 1991 – 1999 325 i (M50 B25 (256S1)|M50 B25 (256S2)) – 141 kW / 192 HP
  • BMW 3 Coupe (E36) 1991 – 1999 328 i (M52 B28 (286S1)) – 142 kW / 193 HP
  • BMW 3 Touring (E30) 1987 – 1994 316 i (M40 B16 (164E1)) – 73 kW / 100 HP
  • BMW 3 Touring (E30) 1987 – 1994 318 i (M40 B18 (184E1)) – 83 kW / 113 HP
  • BMW 3 Touring (E30) 1987 – 1994 318 i (M40 B18 (184E1)) – 85 kW / 115 HP
  • BMW 3 Touring (E36) 1995 – 1999 318 i (M43 B18 (184E2)) – 85 kW / 116 HP
  • BMW 3 Touring (E36) 1995 – 1999 320 i (M52 B20 (206S3)) – 110 kW / 150 HP
  • BMW 3 Touring (E36) 1995 – 1999 323 i (M52 B25 (256S3)) – 125 kW / 170 HP
  • BMW 3 Touring (E36) 1995 – 1999 328 i (M52 B28 (286S1)) – 142 kW / 193 HP
  • BMW 5 (E34) 1987 – 1995 518 i (M40 B18 (184E1)) – 83 kW / 113 HP
  • BMW 5 (E34) 1987 – 1995 518 i (M43 B18 (184E2)) – 85 kW / 115 HP
  • BMW 5 (E34) 1987 – 1995 520 i (M20 B20 (206KA)) – 95 kW / 129 HP
  • BMW 5 (E34) 1987 – 1995 520 i 24V (M50 B20 (206S1)|M50 B20 (206S2)) – 110 kW / 150 HP
  • BMW 5 (E34) 1987 – 1995 525 i (M20 B25 (256K1)) – 125 kW / 170 HP
  • BMW 5 (E34) 1987 – 1995 525 i 24V (M50 B25 (256S1)|M50 B25 (256S2)) – 141 kW / 192 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 (E34) 1991 – 1996 520 i (M50 B20 (206S1)|M50 B20 (206S2)) – 110 kW / 150 HP
  • BMW 5 Touring (E34) 1991 – 1996 525 i (M50 B25 (256S1)|M50 B25 (256S2)) – 141 kW / 192 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 Z3 Roadster (E36) 1995 – 2003 1.9 i (M44 B19 (194S1)) – 103 kW / 140 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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