Rust clear ho ge tu Jo minor holes hyn wahan say leakage ka chance ho sakta. Because rust in holes ko block rakhra. Jab rust clear tu ye holes b clear. But if you replaced pipes and radiator tu might b holes na hun.
Coolant paison ka aata aur log muft ka Pani prefer karty.
Aur coolant green k ilawa b hota like red purple.
Radiator full fill karty.
Bottle per maximum ki line hoti usually. Bas wahan Tak fill karain.nae tu during running of engine when coolant get hot it may spit out of coolant bottle if filled till top.
And make sure that coolant bottle has cap too