[B Myers]

If it's in my shop I drain the system and run a scope down the radiator filler cap and look at the cores for blockage, it there is replace or recore the radiator. It needs a fan shroud with a good clutch, 195 degree tstat that is new, fill with proper mix coolant, run till its flowing and install the cap to pressurize. Using the digital thermometer you can scan the tstat housing for temp and it should run around 200. You can scan areas on the radiator for heat, it should be even, if it has cold spots then its plugged. That should get you fixed. If that's not it then it is not good, pulling water pump and looking for blockage in the block or heads assuming your thermometer is accurate. It is normal to have some coolant loss from the overflow hose due to fluid expansion by the way. If it gets hot and is not boiling over and just running in the 200 range its ok.