Truck is running cold around 169-170 degrees

What is your question?

I have a 2002 Ram 1500 3.7L that is running cold, about 169-170 degrees. thought the thermostat might be stuck open but it was actually stuck closed. I replaced it and still cannot get normal temp. everything has been flushed out so there is no blockage. Fan clutch is new, radiator is new and now the thermostat is new also. Pressure is good and water pump is not leaking. I have not tried the temp sensor but don't know if that would help. Any other ideas would be helpful. Thanks

How long has your 2002 Dodge Ram 1500 had this problem?

few months