Known overheat issues 4.7 RAM V8? EDIT FIXED

I had no heat in a car once. Darn coolant was about a gallon low! IDK where it went but I filled it up, heat came back and it never needed a top off again....weird. we had a dual zone Suburban that I believe had 2 heater cores. The one in the back didnt work well and I was told that you had to park it up a hill to fill the Dexron coolant or else it will have a large air pocket and will make interior sounds like the office water cooler......Glub glub glubbb. We traded it in soon after than on our first string of Chrysler minivans. Been pretty happy with them although this 2012 seems to eat front brake pads and have gone through 2 front window regulators: the cable comes off the plastic guides and drops the glass into the door. Im now wrestling with this oil pressure sensor, seems to keep tripping the CEL with its failed KOEO self test. I think its a defective sensor or a harness issue.