Radiator leaking

you should have it pressure tested..so - it could be a tank or the core...how bad? ive use a little bottle of alum seal...some people dont like it but ive never had a problem...add a little vile to your rad. water ....

You can see some rust water by the reservoir but all lines are dry and when you turn off you only see a drip along the bottom of radiator only the bottom not wet anywhere else

put 1 small tube of alum seal in your warm rad water with it rumming and the leak will stop in 3-15 min...cost is 2-3 $

looks like this ..there are other branda also