Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Coolant cap slightly hissing and loss of coolant
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Old 01-18-2013, 12:40 PM   #4
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Join Date: Feb 2006
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Location: Chicago, IL
What I Drive: 2002 charcoal XZ3

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I once let a shop flush my antifreeze (i know, i know). Next day, coolant hissed and seeped out of the reservoir cap, as if it was overheating. I bought a new cap; did the same thing. I called the dealer back and the tech said that sometimes happens when the reservoir cap is over-torqued - the plastic threads aren't strong enough. I backed-off the cap about an 1/8 of a turn and it was fine...for about a year, when another tech removed & retightened it during the free "courtesy check" that tire shops like to do (because they're not making enuf money off you already??). After that, I used a sharpie to make an alignment mark on the cap & resevoir.
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