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Message: <blockquote data-quote="Richard L" data-source="post: 1018779" data-attributes="member: 52972">Since you live in the far northeast, your ST should not be running warmer as the weather gets colder.  This may not be an emergency issue now, but may get worse with time.Things that could cause overheating are:Radiator (outside front) plugged up with bugs and leaves.Radiator (inside) starting to get plugged up with dirt and corrosion caused by using the wrong coolant, or interior deteriation of hoses.  (hoses deteriorate from the inside)The wrong thermostat installed, installed wrong, or the old one is starting to stick.All of these can be cured with a little TLC maintenance.   Flush the cooling systems, replace the thermostat, check upper and lower radiator hoses, and the heater hoses..replace as necessary...especially if you see black sooty residue the hoses.  Be sure the outside of your radiator core is clear of bugs, leaves, paper and other road debris....Rich</blockquote>