2002 Jeep Grand Cherokee Cranks but won't start after overheating

Jeep dead in my driveway,  one day while driving to work, i noticed my heater wasn't
blowing hot air, next thing I know it was reading 260 and then it just shut off. I pulled
over and noticed it was that the radiator was not hot though. Unlike my other jeep that
normally boils water when it overheats. Anyways, after about 10 minutes it started up,
then 20 mins later died again then had to get towed home.  

Now it just cranks over but wont start. I tested the starter, flushed out the Radiator,
heater core, hoses and engine, replaced the water pump and thermostat. Checked the
oil, low but regular oil color. And cleaned battery terminals and connectors. Also
Checked all fuses under dash.

No check engine light and no codes found per my reader....