Hello and welcome to Just Answer!
When does the engine overheat, when idling or on the highway?
Has the temp gauge been fluctuating lots lately, example does the temp gauge go over to hot and then come down quickly?
When the gauge goes over to hot are the rad fans running?
Have you checked the cores inside the rad to see if they are stopped up?
I assume you have checked the a/c condenser in front of the rad for a restricted air flow, from bugs, dirt and bent over fins, is that correct?
Have you tried to spray cold water onto the rad with a garden hose when it starts to overheat, to see if the temp drops?
I have never seen a torque converter or transmission filter cause an engine to overheat.
It will cause the transmission to overheat, but not the engine is the cooling system is functioning properly.
The a/c condenser is in front of the radiator and you can't really see the radiator unless you pull the a/c condenser ahead. Are you sure there is nothing between the two?
When the vehicle is being driven faster, it does need extra cooling because the engine is under more load. Have you checked inside the radiator to make sure the cores aren't getting stopped up? The small cores that the coolant flows through will plug up over time with scale and reduce the flow through the cores. The rad has to be inspected inside to see if they are getting plugged.
Let me know!
It still is possible that the thermostat you installed is sticking! I would get them to double check that and for the time it takes, replace it if they can't find anything wrong.
I would get them to check the lower rad hose for collapsing, pressure check the new rad cap to make sure it is holding pressure.
I can't see this problem being caused by a torque converter or water pump. Water pump rarely wear out.
Let me know, what they find!
That is great, I am glad they were able to find the problem. You can just insert your photos in this window. There is an insert icon beside the you tube icon and looks like a tree. I would like to see the pictures! I don't recall seeing that on these rads, I have seen the cores plug with scale inside.