Car runs hot but when turn on heat it cools down --has antifreeze?

What is your question?

When you drive the car especially over 55 mph--or near there--it starts to overheat--the temp gauge starts to go up--then when you turn on the heater on high it cools it back down--this is 2013 dodge avenger

What makes this problem better or worse?

Running heat on high will cool it down

How long has your 2013 Dodge Avenger had this problem?

few days