2001 mustang v6 3.8 L code p1285
 

Hello, not too long ago my battery cable was loose and car didnt start. Then i reconnected cable and about an hour later the car overheated code p1285. Coolant puking from radiator bottom near the drain plug, hoses are on the other side, car overheats but when I refill the temperature goes back to normal, but keep overheating as the water drains. I replaced thermostat but keeps doing the same.

-Fan works
-no leaking from hoses
-AC works
-120, xxx miles

Anybody could give me a little hint id appreciate it!! Thank you