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Jeep Wrangler JK
JK General Discussion
Overheating at highway speeds
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<blockquote data-quote="Link311" data-source="post: 459416" data-attributes="member: 25249"><p>I had the same issue. I've been battling overheating issues for over a year with my 2012 jku rubicon. Especially in summer in Phoenix and going uphill it was running 240+ and i couldn't drive faster than 60 mph. First i replaced the radiator. Then the thermostat was replaced. No change so i kept going. Replaced the waterpump and even the transmission oil cooler. Took the winch off. Nothing helped. Since it was only happening at higher speeds and it was fine at lower speeds i didn't suspect the thermostat. Especially since it was replaced. </p><p>I had the engine and cooling system tested and the mechanics said everything was fine. So as a last resort i decided to remove the internal part of the thermostat. It's really simple to do and you'll be able to see if the thermostat is the issue. After this the car was running normal Temps. Apparently the new thermostat that was installed was faulty out of the box. I just threw a new duralast (motorad) thermostat in there since i couldn't get my hands on a mopar one. And voila. Problem solved. </p><p>These thermostats are crap and usually the problem. Suggest taking it out and testing it that way. </p><p>I hope this helps you and other people.</p></blockquote><p></p>
[QUOTE="Link311, post: 459416, member: 25249"] I had the same issue. I've been battling overheating issues for over a year with my 2012 jku rubicon. Especially in summer in Phoenix and going uphill it was running 240+ and i couldn't drive faster than 60 mph. First i replaced the radiator. Then the thermostat was replaced. No change so i kept going. Replaced the waterpump and even the transmission oil cooler. Took the winch off. Nothing helped. Since it was only happening at higher speeds and it was fine at lower speeds i didn't suspect the thermostat. Especially since it was replaced. I had the engine and cooling system tested and the mechanics said everything was fine. So as a last resort i decided to remove the internal part of the thermostat. It's really simple to do and you'll be able to see if the thermostat is the issue. After this the car was running normal Temps. Apparently the new thermostat that was installed was faulty out of the box. I just threw a new duralast (motorad) thermostat in there since i couldn't get my hands on a mopar one. And voila. Problem solved. These thermostats are crap and usually the problem. Suggest taking it out and testing it that way. I hope this helps you and other people. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Overheating at highway speeds
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