1998 b2500 was over heating and looses coolant. I changed radiator and battery now cranks but wont starr

You'll need to check on the root cause of the stall. It's probably preventing the start up. If the vehicle overheated that bad for long, there could be other damage. Spark plugs could be damaged or fouled. Hands on testing is needed, can't say much more than that. www.repairpal.com/repair-shops