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Old 06-11-2019, 05:01 PM   #6
doron
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Location: Sunnyvale, CA
What I Drive: Focus 2012 Hatchback

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Quote:
Originally Posted by Pokerrun388 View Post
Hard to say, it happens. It happened to me on my 13 MK3. I could smell coolant but see no visible leaks. Reserve tank kept loosing coolant over time. The car was still under the 3/36 so I took it into Ford & it was a faulty water pump.
Got it. In my case the leak is extremely visible (and audible...) but happens only and exactly when I turn the engine off. I can drive for hours with the tank remaining topped without losing a drop. Then engine off - wait 5 sec - turbulence, tons of pressure into the tank and tons of fluid runs out, practically emptying the res tank.
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