Engine overtemp creep

[Mcgusto82]

Hi guys. Been a minute for me. 
 

I have 2012 DJ 3.6 AWD. @ 160k miles.   Had it since new.
 

about a month or so ago, after a trans issue I had fixed, I merged on the highway with 70 - 80% throttle, temp started to climb to about 230-232. I controlled it with feather throttle and heat on blast.   We got to where we were going and came back with feather throttle.  Ever since temp creeps into 232 when going over hills.  If the ac is on, temp climbs to 228-230 on flat surfaces.  I live half way up a hill. Every time by the time I arrive home temp climbs to 230 -232
 

so far, engine oil looks clean, coolant filled, tank + cap replaced, thermostat replaced, oil cooler gaskets replaced, and have bled coolant lines several times. 
note: I rebuilt the thermostat with advanced auto kit, problem got worse so I replaced the the whole thing. 
 

the current radiator is 2.5 years old, and the thermostat had been replaced then too. 
then it had a leak from the radiator.  I had used stop leak gunk prior to. 
center heater core replaced when radiator too. 

 

the fan is fine. It runs at slow and fast speeds. 

there is no oil in the coolant. 
 

the water pump seems to spin fine. No rattle, no leak.  There are no other coolant leaks.  
 

observed: when gauge reads 228-230,

With ir temp sensor, top radiator hose : 197 at the thermostat, lower hose: 142-150, random radiator position: 155. 
 

cabin heat very hot. 
 

At the tank, there is visual flow coming into the tank from small hose on top. 
top hose feels firm at hot, and releasing cap vents pressure at hot. 
 

copilot says inefficient radiator, Gemini says bad coolant flow from

thermostat. 
 

please help. 

 

[5rebel9]

Just as the PLASTIC T-Stat cover and stat are known to stick open, they can also do the reverse and only PARTIALLY open. I had this happen last summer with our '13 rt, and got the same situation as you have. I spent the $$ for the Aluminum stat housing and stat...NO problem since.