This is now a bit of a moot point for me now, as I take delivery of my Mondeo tomorrow.

However, my current car a Focus Estate 2012 1.6 Ecoboost 180 (34,000 miles on the clock) which I have had since early 2014 has always suffered from a persistent but slow coolant reduction. What I mean by this is that there appears to be no leakage, but I have to top up the reservoir relatively frequently say every 2-3 months but I now only cover 4,000 miles a year in it. The day I took delivery of it with 5,900 miles on the clock I drove it home 230 miles, from the dealership (having had all the checks prior to me taking it) and when I got home the coolant level was on the minimum line. The dealers apologised for not checking it. After I noticed it happened regularly it went into the local dealers under warranty and was pressure tested 3 times. No problems were found and no signs of leakage were found on the engine etc. 

I did mention to the dealership that I had read that some people had problems with the seals on the water pump, but they said there was no problem with mine.

After three and a half years it still loses coolant.

My wife has the 2015  1.0 125 Focus, I have had to top that up between services and that has only covered 10,500 in two years.

Does anyone else have an idea as to why? Is this common? Other cars I have had required no coolant maintenance, C-Max x2 and Escort Estates x3.

 

did you get any answers to this as my c-max is also losing coolant and no sign of leaking

Wow this is a really common problem with the Ford Focus, I repaired one just yesterday.  

If your not seeing coolant on the driveway or collecting in the undertray then you want to be checking inside the car under the carpets on the drivers side only.

If you find it's wet then you need to read the following.

These cars have a crap design in the coolant pipe work that goes to the heater matrix inside the dashboard, where the alu pipes that come through the bulkhead from engine into the dash board those pipes then connect to more alu pipes that go into the heater matrix.

Now at the pipe join one pipe slides into the other (male/female design) and a crappy rubber o ring is used to seal the joint. These fail all the time and are a common problem that ford know all to well about. 

These pipes and their connection is just behind the dashboard plastic panel that is directly to the left of the clutch pedal. Look around there for wet/fluid. If you take the little plastic door off that dash panel and remove the plastic tab you can then pull the panel back a bit and see the pipes, may want a torch. If you see pink coolant or any wet fluid on around these pipes then your just the next focus owner to suffer this issue.

Go check this and get back to me, if it is this then I can talk you through an easy repair which is cheap. Don't go to ford or garages as they will tell you that you need to change the whole heater matrix and its piping at a cost of £238 including vat from ford just for the parts. The actually issue is a 20p rubber o ring that you can buy from bnq.

rossco

Thanuttiscostman, I have the same issue in my Ford focus ecoboost and being having nightmare to find out what the real issue is. Really need help  with this if no one mind. 

Search the thermostat, it is very possible there.

But it could be leaking anywhere.