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Coolant runs thru the heater core constantly. The heat does not have to be on. If your Jeep is over heating you have a clog in your heater core. If it is not, the heat door under the dash isn’t opening. I don’t know how to fix it but this should be your diagnosis. I can’t help you with the...

You probably won’t believe this but I have a 2015 was doing the same thing. Finally the new mechanic pulled the new thermostat that he installed and found that it was not opening all the way causing a flow issue. He put a new one in after testing it and BOOM! No more overheating on hwy or in...

I had the EXACT same issue. Replaced engine with a Jasper, two new radiators, two new water pumps, flushed heater core and got a little bit of stuff out of it, and countless thermostats. Finally the mechanic tested the most recent thermostat and voila! It wasn’t opening all the way. This causes...

Had all 4 cam phasers replaced and no more code. However, after head replacement the coolant temp goes higher than ever. It went to 249 going to the campground at Windrock. It also did that a couple times on the highway. The mechanic won’t do anything else since I told him his work was shit so...

I’m having the same problem in 2015 JKU AT. Driver side sensor and pigtail replaced. Happens on the interstate only at highway speeds. Just had heads replaced and it started. Oil cooler and water pump also replaced. Oil cooler had been leaking. Have not had the problem at 65 MPH.