[Jack21]

An added note to this on stop n go traffic, something DC has plenty of. 180 deg thermostat seems to be OK for year round use. Temp needle stays between 175 and 185 cruising. The fan sender turns the fan on at 205, and off at 185, so the fan rarely comes on when cruising, even in the summer.

Put a fan override switch on the dash so you can leave the fan on when you get stuck in traffic, particularly in hot weather to keep airflow through the radiator and your temp in the 175 - 185 range. The fan will cycle without your help, but you have an extra margin of safety from overheating controling the fan yourself.