I replace my radiator hose and my 1996 mazda millenia is still overheating.
I'd start thinking about a coolant flush...new thermostat and a new radiator~
try to take out the thermostat, then test again , if same , change cylinder head gasket.
with a spot thermometer could find the "hot spots" on your current radiator~
Not sure Mr. joart, where a head gasket will affect the temperature of the engine...unless it's choked with rust...which we'd see in the coolant stream...if it was there~
Looking for a Used Millenia in your area?
CarGurus has 102 nationwide Millenia listings and the tools to find you a great deal.
Search Mazda Millenia Questions
Mazda Millenia Experts