Doesn't really matter but I'd do it afterwards due to the fact you will lose a lil fluid from disconnecting lines and also you won't run fresh expensive fluid through possibly rusty radiator. Don't forget to connect some spare hose to in/out nipples of bottom of radiator in case bottom it ever gives out so you won't lose radiator fluid. Also i would get replacement front grill lock clips before the project because they always seem to break. Line the hole you put the hose through with spare hose to prevent rubbing and possible cutting.
Doesn't really matter but I'd do it afterwards due to the fact you will lose a lil fluid from disconnecting lines and also you won't run fresh expensive fluid through possibly rusty radiator. Don't forget to connect some spare hose to in/out nipples of bottom of radiator in case bottom it ever gives out so you won't lose radiator fluid. Also i would get replacement front grill lock clips before the project because they always seem to break. Line the hole you put the hose through with spare hose to prevent rubbing and possible cutting.
Line the hole you put the hose through with spare hose to prevent rubbing and possible cutting.