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Try bleeding the air out of the system and watch for when your thermostat opens up. The top radiator hose will get hot when it does. It should open at 203 degrees. If it doesn’t and opens up at a higher temp or doesn’t open at all then you’ll know the thermostat needs to be replaced. I went...

Lol… I’ll be watching it from here on out.

Yes. Had it on a set of blocks.

I had the same issue. Dropped a new radiator and new engine after it failed a block test. Two thermostats went on the old engine with no relief. Overheating continued with new engine and took it back to the mechanic in which he scratched his head and said he didn’t know what could be causing...

Well I think I fixed it. So I purchased a new 203 degree thermostat last night and installed it this morning. Replaced the lost coolant from the install and bled the system. While bleeding it the temp got to 203 and the thermostat fully opened and cooled the engine down to 195 degrees. Took...

So, I burped the system tonight. Very little air was present but I did notice that the thermostat didn’t open up until the engine hit 220 degrees. It’s a 203 thermostat. Looks like I’ll be changing that out tomorrow. I test drove it after burping it and it still ran at 240 with no A/C and...

Thanks for the advice. I’ll update once it’s been done.

Fan kicks on at 226. Overflow is good and no leaks.

I haven’t yet. Mechanic claims there is no air in system but I’ll be doing that in the morning.

I have a 2015 JKU that the engine temp constantly runs 245+ At highway speeds. Before this the Jeep had a bad thermostat that has been replaced twice now. The increase in coolant temp started after the replacement. I have also had the radiator replaced with an OEM replacement and a new engine...