My car starting overheating this year. After 35 minutes of highway driving, at 65 degrees ,then while going 40mph through town I noticed the temp gauge run up just shy of red line. Took it out of gear gliding downhill the temp decreased to the 3/4 mark on the gauge. After a stop for 30 min. I ran on the highway again and the temp gauge was running over the halfway point then the temp ran up again after slowing down to 30-40 mph. New thermostat last year plus new radiator 5 years ago. Antifreeze looks good. What else should I be looking for ?
Thanks
Thanks