Similar concern for the 3.8 V-6...or the 4.6 V-8...the least costly problem is usually a worn out..(stuck open) thermostat. I assume no water leaks? Most costly can be the heater core, due to extensive labor time...Be sure to use OE rated thermostat that opens at 195 degrees...for performance not heat, a 160 degree thermostat is available...but not good for heat build up...not a big job on your Mustang...Hope this helps.
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