This is snowmobile coolant
Get some emery cloth or sand paper and clean off the old solderthen you'll be able to slip the pieces together. Make sure there is no moisture at all in any of the pipes near the point you are sweating the pieces together.otherwise the steam will force out the solder and you will have a leak. Flux will help the solder flow onto pipe.
clean pipe end and fitting socket , (sand paper,wire brush or scotchbrite work well ) should be new penny shiny. apply a thin layer of flux immediately after cleaning, fit pipe into fitting . heat female fitting at bottom of socket , do not apply heat at seam or pipe. heat until solder starts to flow then remove heat ,solder will be sucked into joint . allow to cool before moving . if water is present in system it will create steam pressure and not allow the solder be sucked into the joint. the same will happen on small pieces that have no vent for hot air to escape, valves and other fittings require special care to protect them from heat damage
Learning to solder/weld is a craft, it has a unique touch and feel to it. Knowing when the metal is hot enough to allow the solder to bond and not just melt is a combination of heat, prep, solder and technique. You need to prep the copper 1st, get it clean by sanding it smooth and shiny, no oil or water. Paint the flux where you need it to bond, the solder will bond nicely to copper as long as it’s clean and un-oxidized. I always use oxygen when the copper half inch or greater. The trick is to heat the metal joint area quickly so that the flux does not evaporate. If you camp out on the copper with low heat, by the time you get it hot enough the flux is gone and the copper has oxidized and nothing will stick. You are not trying to melt the copper, just trying to get the copper to melt the solder BEFORE the flux burns off. The flux is your friend, without it, it's gonna oxidize. Practice. Get some copper and some old fitting and practice.
there is something available in the market.
40 Below worked great in our '47 Ford on the Great Race a few years back. We ran in 90+ degree temps in competition conditions for a week with no problems. Heck, we ran without problems the second week as well, but the temp had dropped and we had to weather a hurricane, but that's another story. ;)
