Water boils at 212 degrees. Add a 50/50 mix of anti freeze and we get
223. Add 14-15 lbs of pressure and we get another 45 degrees before boil. Your trucks stock thermostat is 192 degrees. Yes there are lower temps, but you fuel system will never go into closed loop and your fuel mileage will drop like rock, sorta like driving with the choke on all the time. (yes I know there are times when fuel systems go open loop normally, like when you put your foot in it) 210 to 220 is not out of range for your vehicle So questions How fast does it jump to 210, and are we talking from stone cold? Has anything been changed just before this started happening? IE water pump, hose, etc. (thinking air pocket) Is the area between the radiator and ac condenser clean of debris? Is the fan shroud intact? How old is the fan clutch? How old is the water pump(seen impellers worn to nothing and no leak) and the last thing is get some test strips. NAPA p/n FIL4106 I think is the correct one and check for hydrocarbons. Or you can get a test done on a sample taken and sent in through NAPA If there is a truck stop in your area you can get test strips there as well.Whitelightning