AdBlue in the coolant tank
AdBlue in the coolant tank is a corrosion problem, not a cooling one. Do not run the engine to temperature. Urea attacks aluminium, copper and brass — exactly what a radiator, heater matrix and head are made of. Call 01293 248666.
Coolant is an inhibited glycol mix, and the inhibitor package exists specifically to stop the aluminium head, the alloy pump housing, the copper-brass heater matrix and the radiator from corroding. Urea solution overwhelms that and it does so faster hot than cold. The cooling system is also the one system where a contaminated component — the heater matrix — is behind the dashboard and expensive to replace.
Call 01293 248666 From just £89 call-out fee
This is not a drain job, so it is not work we do. AdBlue in Fuel drains and flushes AdBlue contamination — AdBlue put into a fuel tank, or diesel, petrol, water, screenwash or oil put into the AdBlue tank. That is the whole service. AdBlue in the coolant tank is an SCR system fault, and it is fixed by a garage or a franchised dealer with the right diagnostic tooling, not by draining a tank at the roadside.
The page below is here because the question gets asked constantly and the answers online are poor. It is reference material, not a sales page. There is no call-out price quoted for it, because we would not be the ones attending. If you are not certain which of the two you are looking at, call 01293 248666 and describe it — if it is a drain we will quote it, and if it is not we will say so and you will not be charged for the conversation.
AdBlue in the coolant tank — the severity verdict
| Severity | Component risk Frequently needs SCR component work rather than a drain. Quoted before a technician travels. |
|---|---|
| What this is | AdBlue in the coolant tank — an SCR system fault, not a contaminated tank |
| Who fixes it | A garage or franchised dealer with SCR diagnostic tooling |
| Do we do it? | No. AdBlue in Fuel drains AdBlue contamination only |
| Typical cost | £240–£520 at a garage — a guide figure, not our quote |
| If you are unsure | 01293 248666 — we will tell you which of the two it is |
What to do right now
- Do not run the engine up to temperature. A short idle is less bad than a drive, but do neither if you can avoid it.
- Do not add coolant on top to dilute it.
- Call 01293 248666.
What a technician actually does
Full system drain including the block drain where one is fitted, repeat flushing with clean water until the discharge runs clear, refill with the correct specification coolant, bleed the system and pressure test.
Why this is not the same job as the other direction
This is contamination of the fuel side. The SCR system itself is untouched, which is why this direction is the recoverable one — provided the engine has not been run. Starting it is what turns a drain into pump and injector work.
Common questions
How urgent is this if the car is parked?
Less urgent cold than hot, but not indefinite. Urea attacks the alloy and the copper-brass whether or not the engine is running. Same week, not same month.
Will the heater matrix need replacing?
Usually not if it is flushed promptly. If it has been run hot for a long period it is a real possibility, and it is quoted separately — it is a dashboard-out job on many vehicles.
Is this the same as AdBlue in the diesel tank?
No, and the cost profile is different. The diesel-tank version is a drain and flush. This one carries a genuine component risk.
What customers say
4.8 out of 5 from 2,190 Trustpilot reviews. What reviewers mention most is that the technician stayed calm and professional with a driver who was embarrassed and stressed, and that somebody arrived when they said they would.
The most common criticism is price. People do not expect a wrong-fluid job to cost what it costs, and that is a fair complaint to publish rather than bury. The answer is the From just £89 call-out fee, a quote given on the phone before a technician travels, and being told when a job cannot be done at the roadside rather than after somebody has arrived and charged for the visit.
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Who you are dealing with
Work booked through AdBlue in Fuel is carried out by Fuel Fixer Ltd, company no 08520551, registered at Fairway House, Portland Road, East Grinstead, RH19 4ET, trading as Forecourt Assist and part of Fuel Fixer International, which is owned by Stockbridge Capital Holdings.
Reference: GOV.UK — MOT emissions rules.
Across the Fuel Fixer network
AdBlue in Fuel is a service by Forecourt Assist, a brand of Fuel Fixer International, owned by Stockbridge Capital Holdings. The full group directory is at forecourtassist.co.uk/network.