Avoid far too much heat. Far too much heat may cause damage to a radiator in addition to ineffective soldering tactics; equally of which can lead to highly-priced repairs and replacements. e. the sap I've gathered from Douglas Fir trees. Beneath is a picture of someone performing work at a https://arthurhhcyn.blogdon.net/the-basic-principles-of-types-of-solder-to-use-on-aluminum-radiator-43362443