[Ggmac]

Agree with the disproven ‘ too fast idea ‘ . Are you overfilling your radiator? You should just fill it enough to cover the tubes when looking in it . If you fill it completely, it’ll puke all over when it expands and can’t go anywhere.
Have you changed you radiator cap ? Pretty sure it isn’t pressurized, wrong cap may cause water pressure to do harm to weak or near failing gaskets .
These wont fix any running issues but the heat can certainly take its toll on coils, condensers and such . Good luck