my engine isn't running as warm as it use to

I have a 1996 Dodge Grand Caravan SE, 3.3 engine. It ran hot a few months ago and I replaced a radiator, thermostat fan assembly, fan relay and fixed the hoses where they go to the core. The thermostat for the engine temp is falling to the cold corner and the range. The engine seems to run too cool. The engine temp needle falls down to the C mark on the temp gauge. The inside heater runs cool temp wise.