2001 Honda Civic mileage: 140,000. My wife's car is overheating and losing coolant. However, there is no water in the oil and no oil in the coolant. I continue to add coolant, as it gets low. What could be the problem?

 

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(in chronological order)
https://honda-tech.com/forums/honda-civic-2001-2005-78/i-didnt-bother-search-overheating-2682411/
https://honda-tech.com/forums/honda-civic-2001-2005-78/honda-civic04-overheating-problem-2557193/
https://honda-tech.com/forums/honda-civic-2001-2005-78/2005-honda-civic-overheating-saga-2509394/
https://honda-tech.com/forums/honda-civic-2001-2005-78/04-lx-coupe-overheating-just-replaced-t-stat-2620734/
https://honda-tech.com/forums/honda-civic-2001-2005-78/overheating-problem-2613617/
https://honda-tech.com/forums/honda-civic-2001-2005-78/overheating-problems-es1-2603472/
https://honda-tech.com/forums/honda-civic-2001-2005-78/01-overheating-again-i-drive-living-need-help-2586490/
https://honda-tech.com/forums/honda-civic-2001-2005-78/2002-sedan-overheating-picts-2579924/
https://honda-tech.com/forums/honda-civic-2001-2005-78/2005-hond-civic-ex-overheating-2555660/
https://honda-tech.com/forums/honda-civic-2001-2005-78/01-civic-intermittent-overheating-2339016/
https://honda-tech.com/forums/honda-civic-2001-2005-78/2001-honda-civic-overheating-2519383/
https://honda-tech.com/forums/honda-civic-2001-2005-78/car-overheating-2231053/

There are many, many more.

 

i dont understand why the word leak doesnt come to mind