That caused me to go to wikipedia, which calls freeze protection a myth.=20 Now that I think of it, I had and heard of cases where coolant blockage=20 from freezing causes overheating, but never that someone needed to=20 replace the plugs because they did their job. Rusted out, but not=20 popped due to freezing. Joe W On 11/22/2014 3:51 AM, Justin Richards wrote: > Thanks rich, > > I can imagine from your explaination that there's many stories of people > driving of without unplugging first. > > And wrt the plugs I take it from the description it is what I know as a > welch or core plug that are used to plug the holes that the moulding sand > is poured out of. > > Cheers Justin > >> There is another type that is inserted in to the engine block in >> place of what we Americans call a freeze plug. I believe you folks call >> it a soft plug. Again you plug it in at night and it will keep the >> coolant at about freezing in 30 or 40 degree f below zero temperatures. >> --=20 Joe Wronski jwronski@stillwatereng.net www.stillwatereng.net --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .