Reply to "New motor, coolant temp creeps up between 195 & gets close to 230"

So after work I jacked up the rear of the car, opened the bleeder wing nuts on top of the radiator and some air did come out of the passenger side. I removed the radiator cap from both tanks and opened the heater valve. I started the car and watched air bubbles escape from the main tank for 15 or 20 minutes. The temp guage eventually got up to about 200 - 210 on my 230 temp guage. I swapped in a 260 temp guage I had from years ago and it read about 220 so I left that one in with the in line resistor as the display looks more accurate. I believe my ground cable may not have been tight enough on my new battery so that may have contributed to my erratic guage readings? Hope to take her out next weekend to see how the temp looks. Thanks to everyone for the help.