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Quick check if head gasket is failed, look at your oil dipstick and see if your oil has turned into a milkshake looking liquid. I agree with those guys above. Sounds like a thermostat issue. There is an airbleed valve on it that allows you to burb it (but do when it's cold though!!).

See my post I just recently did. If you replaced the thermostat, I would go after the engine coolant sensor. It was $30 and a piece of cake to replace. See this video I found to get to it without taking your fender completely off. This will be just one more thing that you can knock out as...

OK, been a few days since I've replaced the thermostat. Wanted to let everyone know that my fuel mileage just increased by about 20% improvement! Holy crap, I wish I would've done this sooner. I had resigned myself to poor gas mileage.

Nice ride! I did a bunch of troubleshooting. I never did get a code reported on the OBDII port. First, I replaced the engine coolant sensor. That didn't have any impact on the gauge reading high temps when downshifting up a hill. So then, I just straight up replaced the thermostat. Cost me...

I have a 2015 Jeep JK unlimited. I was worried, so I just had a radiator flush performed at the shop and I'm still experiencing the same issue. Under normal load/freeway driving, the temp gauge is rock steady at center. As I climb a grade on the freeway and it downshifts to higher RPM's, the...