My 2000 Concorde LXi with 155,000 miles has been well maintained. I just spent #1400 to remove a dent to my rear fender that I was responsible for (backed into my new boat trailer guide rail), and about $1200 to stop leaks that were recommended for repair by three separate mechanics (trusting soul that I am). The leaks involved a replacement of the steering fluid tubes (expensive puppies), a water pump replacement, and while the were at it, another timing belt. Steering fluid leak stopped dead in its tracks. However, it has taken three months and two other needless replacements to stop the antifreeze I find on my garage floor each morning; about two tablespoons full at most. Sometimes... (but rarely) none at all. Well Mr. Hammer Mechanic (HM) now tells me he is SURE he's found the source of my leak; just above the water pump housing on the driver's side along the edge of the head gasket. That's right... THE HEAD GASKET. How I left that garage without committing murder escapes me. But all is not lost, according to HM; there's a product called K&W FiberLock that pours into the radiator that finds these little nooks and crannies where air enters and fills then up. Failing to believe ANYTHING at this point, I jotted down the products name and ran a search on YouTube. First thing I found was about a minute and a half video from a lady adising "Don't Buy FiberLock"... or something to that affect. She point out a few of the things that I immediately thought of as I read the label of that little green bottle while listening to Mr. HM with my smokin' ear lobes. Possible area that could plug and create worse problems... heater core, radiator, T-stat. When I mentioned heater core to Mr. HM, he replied by showing me two large clamps he'd use to pinch the hoses. He said nothing about flushing the system and replacing the coolant after the procedure so I don't know what the hell good those clamps would do. When I got home and read the instructions further, the FiberLock is supposed to REMAIN in the cooling system. So...????? A guy on YouTube who seemed to know what he was doing, but using something that sounds like "liquid steel" (not FiberLock), said he removed the Tstat and ran his stuff through the system without it. That made sense! I love my car! I made the decision to keep it and put these extra bucks into it. NO ONE told me I had a leaking head gasket. Had I known that, I probably would not had invested more and would be driving something else today. I'd still like to salvage this mess somehow. As I see it - assuming I DO have a head gasket issue (and I probably do. Hell! There's nuthin' ta replace!) I can gamble with the liquid repair. Which brings me to my question: What's the probability of that stuff solving my problem give the above as being true?