CAP EXPANSION TANK 1.4 BAR

Name: CAP EXPANSION TANK 1.4 BAR
Brand: Arrowhead
SKU: 308474
Price: 108.1 ZAR
Availability: InStock

Brand: Arrowhead

SKU: 308474

Category: COOLING, PRESSURE CAP

R108,10 incl. 15% VAT

✓ In stock, ships nationwide via The Courier Guy

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Fitment: Fits selected Mercedes-Benz models. Confirm exact fitment before ordering.

Product Description

Ensure your Mercedes-Benz’s cooling system maintains optimal pressure with the Arrowhead CAP EXPANSION TANK 1.4 BAR. This cooling pressure cap is designed to regulate and maintain the correct pressure in your vehicle’s expansion tank, helping to prevent coolant loss and overheating. The robust plastic construction features a threaded base for secure fitment and a built-in pressure relief valve to release excess pressure safely.

This part is compatible with select Mercedes-Benz models, including popular variants like the Sprinter 906 and Vito W639. Always confirm your vehicle’s model, year, engine size, and engine code to guarantee correct fitment. Using the right pressure cap is essential for the proper functioning of your cooling system.

Common symptoms of a faulty expansion tank cap include coolant leaks around the cap, overheating, loss of coolant with no visible leaks, collapsed or swollen radiator hoses, and irregular coolant levels. You may also notice warning lights on your dashboard or steam escaping from the expansion tank area.

Replace your cooling pressure cap if you notice signs of wear, visible damage, or pressure loss. It is also recommended to change the cap during routine cooling system maintenance or when replacing the expansion tank.

Shop with confidence at MiMi Auto Parts. We offer nationwide delivery across South Africa and are committed to helping you find the right part for your Mercedes-Benz. Always double-check your vehicle details before ordering to ensure compatibility.

Common signs this part may need replacement

Coolant leaking around expansion tank cap
Engine overheating
Loss of coolant with no visible leaks
Radiator hoses collapsing or swelling
Coolant warning light on dashboard
Steam or hissing from expansion tank area
Difficulty maintaining correct coolant level
Visible cracks or damage on cap

Typical replacement guidance

Replace the expansion tank cap if you observe coolant leaks, pressure loss, or visible damage. It is also wise to replace it during cooling system maintenance or when changing the expansion tank.

Why timely replacement matters

A faulty cooling pressure cap can lead to overheating and engine damage due to loss of pressure or coolant. Timely replacement helps maintain safe operating temperatures and prevents costly repairs.

Vehicle Compatibility

This part is confirmed to fit the following vehicles:

MERCEDES-BENZ SPRINTER 3,5-t Bus (B906) 2006 – 2026 311 CDI (906.731, 906.733, 906.735) (OM 646.985) – 80 kW / 109 HP
MERCEDES-BENZ SPRINTER 3,5-t Bus (B906) 2006 – 2026 315 CDI (906.731, 906.733, 906.735) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Bus (B906) 2006 – 2026 315 CDI (906.733) (OM 651.955|OM 651.956|OM 651.957) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Bus (B906) 2006 – 2026 318 CDI (906.731, 906.733, 906.735) (OM 642.896|OM 642.986|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 3,5-t Bus (B906) 2006 – 2026 319 CDI / BlueTEC 4×4 (906.731, 906.733, 906.735) (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 309 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 646.984) – 65 kW / 88 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 311 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 646.985) – 80 kW / 109 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 311 CDI (906.133, 906.135) (OM 651.957) – 85 kW / 116 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 313 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 646.986) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 313 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 651.955|OM 651.956|OM 651.957) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 315 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 318 CDI (906.131, 906.133, 906.135, 906.231, 906.233,… (OM 642.896|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 319 CDI / BlueTEC (906.131, 906.133, 906.135, 906.231,… (OM 642.896|OM 642.898|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 3,5-t Platform/Chassis (B906) 2006 – 2018 319 CDI / BlueTEC 4×4 (906.131, 906.133, 906.135,… (OM 642.896|OM 642.898|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 309 CDI (906.631, 906.633, 906.635, 906.637) (OM 646.984) – 65 kW / 88 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 311 CDI (906.631, 906.633, 906.635, 906.637) (OM 646.985) – 80 kW / 109 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 313 CDI (906.631, 906.633, 906.635, 906.637) (OM 646.986) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 313 CDI (906.631, 906.633, 906.635, 906.637) (OM 651.940|OM 651.955|OM 651.956|OM 651.957) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 315 CDI (906.631, 906.633, 906.635, 906.637) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 315 CDI (906.633, 906.637) (OM 651.955|OM 651.956|OM 651.957) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 315 CDI 4×4 (906.631, 906.633, 906.635, 906.637) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 318 CDI (906.631, 906.633, 906.635, 906.637) (OM 642.896|OM 642.986|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 319 CDI / BlueTEC (906.631, 906.633, 906.635, 906.637) (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 3,5-t Van (B906) 2006 – 2020 319 CDI / BlueTEC 4×4 (906.631, 906.633, 906.635,… (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 3-t Platform/Chassis (B906) 2006 – 2016 213 CDI (906.111, 906.113, 906.211, 906.213) (OM 646.986) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3-t Platform/Chassis (B906) 2006 – 2016 213 CDI (906.111, 906.113, 906.211, 906.213) (OM 651.955|OM 651.956|OM 651.957) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 3-t Van (B906) 2006 – 2009 218 CDI (906.611, 906.613) (OM 642.896|OM 642.992) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 4,6-t Platform/Chassis (B906) 2006 – 2018 413 CDI (906.153, 906.155, 906.253, 906.255) (OM 651.955|OM 651.956|OM 651.957) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 4,6-t Platform/Chassis (B906) 2006 – 2018 415 CDI (906.153, 906.155, 906.253, 906.255) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 4,6-t Platform/Chassis (B906) 2006 – 2018 418 CDI (906.153, 906.155, 906.253, 906.255) (OM 642.896|OM 642.986|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 4,6-t Platform/Chassis (B906) 2006 – 2018 419 CDI (906.153, 906.155, 906.253, 906.255) (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 4,6-t Van (B906) 2009 – 2020 415 CDI (906.631, 906.633, 906.635, 906.655) (OM 651.955|OM 651.956|OM 651.957) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 4,6-t Van (B906) 2009 – 2020 415 CDI (906.653, 906.655, 906.657) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 4,6-t Van (B906) 2009 – 2020 418 CDI (906.653, 906.655, 906.657) (OM 642.896|OM 642.986|OM 642.992) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 4,6-t Van (B906) 2009 – 2020 419 CDI (906.653, 906.655, 906.657) (OM 642.896|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 509 CDI (906.153, 906.155, 906.253, 906.255) (OM 646.984) – 65 kW / 88 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 513 CDI (906.155, 906.253, 906.255) (OM 646.986) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 513 CDI (906.155, 906.253, 906.255, 906.153) (OM 651.955|OM 651.956|OM 651.957) – 95 kW / 129 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 515 CDI (906.153, 906.155, 906.253, 906.255) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 515 CDI 4×4 (906.153, 906.155, 906.253, 906.255) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 518 CDI (906.153, 906.155, 906.253, 906.255) (OM 642.896|OM 642.986|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 519 CDI / BlueTEC (906.153, 906.155, 906.253, 906.255) (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 5-t Platform/Chassis (B906) 2006 – 2018 519 CDI / BlueTEC 4×4 (906.153, 906.155, 906.253,… (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 509 CDI (906.653, 906.655, 906.657) (OM 646.984) – 65 kW / 88 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 515 CDI (906.653, 906.655, 906.657) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 515 CDI (906.655, 906.653, 906.957, 906.657) (OM 651.955|OM 651.956|OM 651.957) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 515 CDI 4×4 (906.653, 906.655, 906.657) (OM 646.986|OM 646.989|OM 646.990) – 110 kW / 150 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 516 CDI 4×4 (906.653, 906.655, 906.657) (OM 651.955|OM 651.956|OM 651.957) – 120 kW / 163 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 518 CDI (906.653, 906.655, 906.657) (OM 642.896|OM 642.986|OM 642.992|OM 642.993) – 135 kW / 184 HP
MERCEDES-BENZ SPRINTER 5-t Van (B906) 2006 – 2026 519 CDI / BlueTEC (906.653, 906.655, 906.657) (OM 642.896|OM 642.898|OM 642.986|OM 642.992) – 140 kW / 190 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.