Remedy: Implementing excessive heat to the radiator can cause damage to the radiator and should induce the solder to not adhere properly. When Element "B" is added,, Element "A" is not disturbed, since the temp with the soldering the second part is reduced than that of the 1st. Solders can https://ricardolzinz.blogminds.com/getting-my-types-of-solder-to-use-on-aluminum-radiator-to-work-25092323