I have a 2010 avenger with 292 thousand miles. It’s been overheating recently When I get stuck in traffic or sometimes when I’m just driving on the fwy at a steady speed of 75. Sometimes turning the heater on full blast brings it back down but not all the time.
ive checked my engine oil numerous times for sludge and there is none. Also there are no noticeable leaks coming from the car. Both of my fans are coming on when the cars warmed up. Could it be the two thermostats or the water pump?