durango overheating

we own a 1999 dodge durango V8 5.2 liter engine...have been having issues with it overheating....at first it seemed to be the water pump, replaced that and ran fine for a while. then the thermostat went replaced that and ran fine, now it started overheating again...everything lead towards it being the thermostat again so replaced it again. ran fine for a few days and is getting too hot again...it never actually "overheats" but gets pretty close. we checked fluids while car was hot and cold and it is always full...cant fit anymore antifreeze in it. also, it doesnt get hot if i just take it to the store and back it only gets near overheating after driving continuously for about 15 minutes. any suggestions would be greatly appreciated!!

Is the radiator the original one?
Sounds like it may be partially clogged or reduce flow!
Does yours have the mechanical fan?
It could also be the fan clutch!

we own a 1999 dodge durango V8 5.2 liter engine...have been having issues with it overheating....at first it seemed to be the water pump, replaced that and ran fine for a while. then the thermostat went replaced that and ran fine, now it started overheating again...everything lead towards it being the thermostat again so replaced it again. ran fine for a few days and is getting too hot again...it never actually "overheats" but gets pretty close. we checked fluids while car was hot and cold and it is always full...cant fit anymore antifreeze in it. also, it doesnt get hot if i just take it to the store and back it only gets near overheating after driving continuously for about 15 minutes. any suggestions would be greatly appreciated!!

I had the same problem on my rango I changed the fan clutch and the electric fan problem solved I'm down in south Texas hot as he'll... I hope this helps