Jeep Wrangler only overheats on highway...what's going on? (not what I expected)
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- Опубліковано 22 бер 2023
- Troubleshooting process on Jeep Wrangler with the Chrysler 3.6L Pentastar engine that is overheating on the highway only. We go through the process of bleeding air out of the system and move toward thermostat and water pump replacement. You might be surprised what it actually was.
Links to items showcased in video:
cooling system funnel kit: amzn.to/3K4P41k
vacuum refilling kit: amzn.to/40x6A3O
launch diagun: amzn.to/40dZ8L0
thermostat: amzn.to/40u8LFk
water pump: amzn.to/42FBn0i
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My 2018 Jeep Wrangler JK Unlimited Sport 3.6 had the "exact, to the tee, same issue. I wanted to thank you for putting the time in to do the diagnostic and testing.. And for posting your findings on UA-cam. Thabk you so much. 🙏
Same thing happened to me and this helped me a lot. I kept thinking I had an air problem as well, because the thermostat in this case was just replaced (by me) two weeks ago. Thanks!!!
I have the same issue and that same POS THERMOSTAT!!!!!! My Mopar replacement will be here Friday. Thanks for this video, great job…
My 2015 JKU (64,ooo miles) just started doing this. Exactly the same mannerisms as well (only at highway speeds) or if I get on the throttle to pass traffic.
As soon as you said the lower rad hose was cold and spongey i knew it was thermostat 😂 i literally kept yelling thermostat every few mins. Its 2 bolts and you're done! The worst part of a thermostat job on the 3.6 is refilling and burping the system
Thanks for the video. It was kinda obvious with the lack of flow and the warm n cold hoses, but you went through the steps n helped troubleshoot the problem and resolution. Most people who don't work on their own rigs should appreciate learning something. The video was good overall. Keep up the good work. Your time is appreciated.
I thought right away, thermostat, when your bottom hose was cold, but I very much enjoyed your troubleshooting process. I have a 2017 that went through 4 autozone thermostats while waiting for an OEM to arrive. I am going to buy that vacuum refill system because of you, lol. My recommendation is, unless you cant get your hands on an OEM thermostat right away, do not use the Duralast brand, they do not work. Thank you for the video, I always enjoy learning new things.
This has to be one of the best and most informative videos on testing the cooling system. Thanks. Dealer here in Bellingham Jeep sabotage my Jeep a couple of weeks ago. Been fixing everything and been keeping a eye on my cooling system ever since which until then didn't have problems. They installed a exhaust system and sabotaged that too. Including the parking cable which was burnt.
There's a purge valve on the thermostat housing to get the air out of the system
My 2015 JKU Sahara is doing the same exact thing right now. I have to drive no more than 40 to 45 miles per hour to avoid the temperature gauge from peaking out. I had a new thermostat installed last summer because there was an engine code for a faulty thermostat sensor. The new thermostat fixed the engine code. And now 9 months later the thermostat is obviously trash again. I'm 100% certain after watching your video that I'll be changing the thermostat, this weekend.
Besides the hoses, the thermostat would have been the next thing, 99% of the time it’s the thermostat. I change my own, most times Jeeps prefer Mopar engine parts. I trust only certain mechanics to work on my cars, stopped using dealer’s years ago because of over pricing on parts. I’ve never seen or heard of the toy you used to get the bubbles, not even in the military. You can use your body to nudge the car back and let rock forward, it’s what I do to top off the radiator… real old school.
I love your video,lm having the same problem with mine,now l know what needs to be fix exactly, thanks for sharing,
Excellent video! Exactly what's going on with a friend's Wrangler that has a recent replacement thermostat purchased from O'Riellys. I'm now really suspicious that this relatively new thermostat is junk. Waiting for a supposedly genuine MAHLE TI 236 95 to arrive from Amazon.
Explorer. I owned a 89 ranger and it was a monumental improvements over the previous gen
Just had a similar problem on my 2013 JK, threw a new Mopar thermostat at it, and we're all good.
I have an 07 jk. Last time I took a 4x4 trip my jeep was running warmer then usual on the highway. Once I got there everything was fine. On the trip back everything was fine. Not to long after I got a code that basically said it was running cool. Now the therm was only a few months old so I changed the sensor and cleared the code. About 2 weeks go by and the code came up again. Took out the therm and sure enough, it was stuck open.
this helped. i just replaced my thermostat a few months ago so i didnt think it was that. thought i put air in the system when i accidently put washer fluid in the coolant reservoir. 2 yellow lids the same size with black writing haha, thankfully it was only the reservoir and dumped it back in the jug. so i watch this video and look up my receipt for the thermostat and what do ya know...MOTORAD. guess thats what i get for spending $20 for the part.
My 15 JKUR first needed a thermostat after overheating on highway too. Then my fan stopped working and I had to replace the fan, shroud and electrical, then it was normal again. Now I have an aluminum radiator and a DVS vented hood. Good to go
Great video buddy! The spring on that thermostat was indeed upside down! But that might not be the only problem for all these aftermarket parts going bad. I have a 2012 Ruby and it has the exact same issue. I have replaced mine with an aftermarket and the problem came back in about three weeks. I have done further research and I feel the problem may be two-fold! Number one: We are all replacing our OEM with plastic housed aftermarket units because Mopar has been on Gallactic backorder for about a year! Number two: Ninety-nine% of the aftermarket are plastic. There are some companies that are making aluminum housed units. I think in addition to some being assembled with the spring upside down, the plastic used in the aftermarket is not able to withstand the temp dynamics for very long. This may cause the housing to distort and cause binding due to the spring plate stilts being out of alignment. I have just purchased an aluminum unit from a company thru Amazon called MILIPARTS. I'll be swapping it soon! I'll update with my initial results!
Great video… I highly recommend watching it.