Hi everyone! I have a Ford Focus MK3, 2.0 Duratec engine, 49k miles, for which I wanted to change the whole coolant/water mix for maintenance purposes.

The manual says the whole capacity is 6.5L, 50% should be concentrated coolant and 50% distilled water.

So I bought 4L of Total coolant (organic, red color); 3L to use for sure and 1L just in case it needs a bit more, aiming to save what’s left.

I brought the 4L to a mechanic who did the whole job. Sadly I wasn’t clear enough and just trusted that he would know but… he actually put all of the 4L of coolant and completed it with distilled water.

So now I guess the car has a mix with approximately 65/35 coolant/water which is not what the manual suggests, but the mechanic told me it is “better” that way.

What do you suggest?

  • Do I move on and just keep an eye on the temperature indicator? (I read that coolant’s heat transfer capacity is not as good as water’s).
  • Do I, somehow, “adjust” the mix by getting some out of the deposit and filling with water? I don’t know how to “get some out”, but I read some people use turkey basters for removing excess.
  • Do I replace everything again? The bad part is all of the cash I spent on the 4L of coolant and the mechanic’s work.

Thank you in advance!

  • dmaxprinOPBEnglish
    1·
    10 months ago

    Thank you all very much for your responses! I understand that the mix is not ideal but it likely won’t be a problem.

    However some of you mentioned that in a hot climate a 50/50 mix is more important; in my country, summer will start soon and days of 35°C are quite common (not more that 40 though), so I’ll watch the engine temperature closely and if necessary adjust the mix in the way you suggested. My bad that I didn’t include this fact initially in the post.