If I let it- up into the red...it runs a bit over the 210 for the first 30 miles or so, then jumps quickly up to 230-35 before I turn off air and turn on heat - just had mechanic check water pump, fuel pump, head gasket, etc. etc. - the only thing he found was that the radiator was 20 degrees difference between top and bottom - we're planning on taking it out (again) to have it flushed (again), at a radiator shop tonight - maybe that will work...?