2005 T&C Overheating

Hey all, noob to the forum and noob to this car.

I have a 2005 Chrysler T&C that is overheating. Last week I was leaking cooland. I found
a leak in the exhaust flange and replaced it, the hose and the thermostat. We drove about
300 miles and all was well. Now she is overheating. I removed thermostat, no change.
Replaced Thermostat, no change.

The coolant no longer leaks. Reservoir is still full. Heat inside not working properly either.
It's kinda "warm" but just barely. I reset the heating system. Both radiator fans are still
working. I checked the return hose and tried to remove the radiator car, but it does not
remove completely, only twists up to depressurize.

Where do I look for a clog in the radiator? I bought a new water pump but havent installed
yet. What are the other things I should be looking for?

Thanks! Jason