Coolant Expansion Header Tank 1826442 for Ford Transit Custom & Transit Mk8

Check part compatibility by using our vehicle filter options below. If you find your car, this part is compatible.

Keep your Ford Transit Custom / Transit MK8’s cooling system in top condition with this durable coolant expansion (header) tank – part 1826442. Engineered to meet OEM-quality standards, this aftermarket tank provides a reliable reservoir for excess coolant, helping to maintain proper pressure, minimize overflow, and reduce the risk of engine overheating. It's a direct-fit replacement for the original unit, making it ideal if your current tank has cracked, warped, or developed leaks over time.

OEM Number : 1224233, 1301104, 1770183, 3M5H8100AC, 3M5H-8100-AC, BK218K218AE, BK218K218AF, BK21-8K218-AF, BK218K218AH 

Compatible Models: Ford Transit MK8 (2013–present) and Transit Custom (2012–present)

Placement on Vehicle : Front Axle, Upper

Width : 260mm

Length : 310 mm

Quantity : 1

Condition: New, aftermarket parts meeting OEM standards

Fitment: Direct replacement for the original part

Our SKU : TFO1826442_313

All our COOLANT EXPANSION HEADER TANK 1826442 FORD TRANSIT CUSTOM & TRANSIT MK8 are OEM quality and reliable after market car parts. This COOLANT EXPANSION HEADER TANK 1826442 FORD TRANSIT CUSTOM & TRANSIT MK8 is specifically compatible with Ford: Tourneo Custom, Transit, Transit Custom, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

❓ FAQs — Coolant Expansion Header Tank 1826442

1. What vehicles is this expansion tank compatible with?
This tank is compatible with Ford Transit MK8 and Transit Custom models. It fits a variety of engines, including the 2.0 EcoBlue variants. 

2. What does the expansion tank do?
The expansion (header) tank holds excess coolant when the engine heats up and coolant expands. When the engine cools, the coolant is drawn back into the system, helping to balance pressure and avoid air pockets.

3. What are common signs that this tank needs replacing?

• Visible cracks, discoloration, or deformation in the tank.

• Coolant leaking under the van or around the tank area.

• Consistent low coolant warning / needing to top up more often.

• Pressure problems or bubbling in the cooling system.

4. Is this tank a genuine Ford part?
No — this version from D2P AutoParts is an aftermarket tank, built to OEM-equivalent quality. It’s designed to be a reliable, cost-effective replacement.

5. How difficult is it to replace the expansion tank?

• Drain the cooling system or lower coolant level to avoid spills.

• Remove the old tank (unclip / unbolt it and disconnect hoses).

• Fit the new tank in the same orientation, reconnect hoses, and secure it.

• Refill coolant and bleed the system to remove any trapped air.

6. Do I need to use specific coolant with this tank?
You should use the coolant recommended by Ford for your Transit Custom / MK8 engine. Using the correct type helps prevent corrosion and maintains proper cooling system performance.

7. Will replacing the tank fix coolant loss issues?
If your coolant loss is due to a cracked or leaking expansion tank, then yes, replacing it should resolve the issue. If the leak is elsewhere (e.g. hoses or radiator), additional checks may be needed.

8. Does the tank come with a warranty?
All products are protected by a upto 10 year worry-free warranty depending on Part 

9. Is it safe to drive if my expansion tank is damaged?
Driving with a cracked or leaking tank is risky: you may lose coolant, which can lead to overheating, air locks, or cooling system failure. It’s best to replace it as soon as possible.

10. Why should I buy this part from D2P AutoParts?

• OEM‑equivalent quality at a lower cost than Ford‑branded parts

• Reliable construction to meet or exceed original specifications

• Compatible with key Transit Custom and Transit MK8 models

• Good stock availability and UK-focused service

1. Standard Shipping (Free) - Please allow 1-3 days for your order to be delivered 
2. DPD Next Day (£4.99) - Please place orders between Monday - Thursday before 4 PM UK time. This service applies to UK Mainland orders only.
3. Royal Mail Special Special Saturday Delivery (£19) - Please place orders between Monday - Friday before 3 PM UK time. 
4. International - Rates vary based on product size. Please enquire for further details. 

We do not provide any guarantees on shipping times, as we are reliant on 3rd parties. However, we strive to ensure that our customers are always satisfied.

All products are protected by a upto 10 year worry-free warranty depending on Part 

Warranty Coverage: Eligibility: To be eligible for 10-year warranty coverage, the car part must be fitted by a certified professional mechanic. Proof of fitment, including the mechanic's certification, must be submitted to Amesplan LTD within 30 days of the part's purchase date. Please send supporting documentation to us via email.In case a purchased product becomes faulty during its warranty period, for reasons unrelated to your acts, omissions or misuse of the goods, you must promptly notify us and fill out a warranty claim form. 

Warranty Non-Coverage: We do not have any liability for any defect arising from normal wear & tear, wilful damage, negligence, tampering of the goods, incorrect fitting of the goods by you and/or a third party. We are also not liable for any abnormal working conditions, alteration or repair of the goods or a failure to follow goods manufacturers' instructions (whether oral or in writing) 

We have a 180-day return policy, which means you have 180 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unused, and in its original packaging. You will also need the receipt or proof of purchase. 

For All Return buyers pay Return Postage.Returns will only be processed after we receive the approved part and a member of our team fully inspects the returned item & successfully matches the returned part to the return reason. 

For All UK orders, we offer free return. We do not offer any reimbursement of shipping costs for Any orders on original sale like Next Day Postage. 

For All Outside UK order  We do not offer any reimbursement of shipping costs for Any orders on either the original sale or the return. 

Please direct all questions to sales@d2pautoparts.com. 

Damages and issues 
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exchanges 

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds 
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund.