DIY Aluminum Radiator Repair

If you try those HF rods, use a new SS brush to clean the aluminum you are planning to solder. I have a dedicated SS brush that I use with those solder rods, and they work pretty good. I've used them on several aluminum projects. I wouldn't trust them on anything too important though. I'd also be afraid to go near an aluminum radiator with a mapp gas torch though - with how thin the tubes/cooling fins are.