Not collapsing the bottom hose as far as I can see.

The 230 is from the digital water temp gauge. In 90 degree f weather, it seems it would be unusual to run an engine for 5-7 minutes without reaching 180. At which point hot liquid should begin to flow into the upper radiator hose as long as the thermostat is working, which it is. I think that's why I'm not believing it's just a bad temperature reading.