Mysterious coolant leak?

2016 FORD FOCUS
130,000 MILES • 1.0L • 3 CYL • TURBO • 2WD • AUTOMATIC
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WALLY AB
  • MEMBER
  • 97 POSTS
Replaced the coolant tank twice. Car drives with no leaks for a few days then starts leaking suddenly. Very frustrating. Shop couldn't find anything pressure testing it.
May 31, 2024 at 7:39 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
That engine has a lot of plastic parts in the cooling system that are failure prone. The main water outlet and the electric coolant pump being common leaks. Probably the easiest way to find it would be to use some plain water to clean any of the current leaked coolant away. Then add some UV dye to the coolant and wait for it to leak and look for the area with the most dye. It may take both heat and pressure for it to leak.
May 31, 2024 at 8:47 AM
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