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Old 06-04-2016, 07:35 PM   #1
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Engine temp gauge runs at 3/4 on freeways

I have a 2007 wrangler unlimited and lately the engine coolant temp gauge has been rising to 3/4 when I drive freeway speed ~65mph, and the A/C will only spit out hot air when it does. Coolant is brand new and the level is fine. And today when I turned the car off I heard a sort of bubbling noise coming from what sounded like around the coolant container. Anyone have any ideas what is going on here or is this just normal due to the 118 degree weather here in Arizona?
Thanks
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Old 06-05-2016, 08:54 AM   #2
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I have had the same issues with my '09 Wrangler in Socal. Make sure your thermostat is good to go, there's no leak from your water pump, and your coolant is Mopar/Zerex HOAT, not off brand. I've noticed if I turn up the the heater to pull the heat out of the engine for 5-10 minutes the temp will go down and the A/C will start blowing cold again.

I've got a water pump leak I know can't be helping, but all of the above has helped keep it lower. The HOAT is a big one because if it's not the proper coolant it'll clot up. Make sure your radiator fins are clear of mud/dirt/etc.

Hope that helps!

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Old 06-05-2016, 09:40 AM   #3
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3/4 is hot but not excessive. I'd verify real temp with an IR gun. Is the rad fan locking up at these temps? I would start with making sure the rad fins are nice and clean. Then I would take a good look at the rad hoses, if the lower hose is getting weak it could be partially collapsing at higher speed of the water pump. I now see coolant is new, was a flush performed?
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Old 06-05-2016, 10:00 AM   #4
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If the coolant is new then pull the cap and make sure the system is burped. Could just be air.
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Old 06-05-2016, 06:13 PM   #5
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Quote:
Originally Posted by Blue Baby Sound View Post
If the coolant is new then pull the cap and make sure the system is burped. Could just be air.
This, just be sure not to pull it off when its hot and dont look straight into the tank. best time to check it is in the mornings when the motor is cold.
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Did you unplug it and plug it back in?
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Old 06-05-2016, 07:08 PM   #6
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Have same type of issue with a 2012 JKUR. 70 mph, slight hills, oat of about 85 to 90 got temp gauge up to 3/4 and my trail dash went up to about 244. Have replaced the radiator, had a coolant flush, replaced the thermostat due to running hot but after all that still runs hot on hills. Have 4.10 with 315x70rx17. Still trying to get a handle on it. Any ideas ?
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Old 06-05-2016, 10:09 PM   #7
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Is the fan coming on, I saw a SB about that.
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Old 06-05-2016, 10:22 PM   #8
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How many rpms are you running when you see those temps?

If I'm going uphill against a strong wind at 70mph and downshift I'll be running 3k or almost 4k rpms and hit those temps for a minute.
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Old 06-06-2016, 10:36 AM   #9
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The replaced the fan motor and controler last year. No help. On some of the steeper hills it will downshift to 3. Normally will run in 5 then go to 4 on inclines. Even on the flat sections, with a head wind will run 230 to 235. Flat, no wind I can tell when the fan kicks in cause the temp will drop from about 230 back down to 220 or so. On downhill sections temp will drop further into the mid to upper teens.
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Old 06-06-2016, 02:52 PM   #10
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Hi every body,

The temperature in our part of the world, gets up to 122 degrees during the long summer months, and the best solution to the JK heating up problem is installing a fan with a thermal clutch on the water pump.
No matter what the temperature is, an engine fitted with a thermal cooling fan, with good coolant, thermostat and radiator would not exceed 180 degrees.

It works here, so it should work for Arizona... I think

this an example of a thermal clutch
http://www.amazon.com/Hayden-Automot..._dp_o_pC_S_ttl

Hope this helps
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Old 06-06-2016, 04:42 PM   #11
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Quote:
Originally Posted by Nayef View Post
Hi every body, The temperature in our part of the world, gets up to 122 degrees during the long summer months, and the best solution to the JK heating up problem is installing a fan with a thermal clutch on the water pump. No matter what the temperature is, an engine fitted with a thermal cooling fan, with good coolant, thermostat and radiator would not exceed 180 degrees. It works here, so it should work for Arizona... I think this an example of a thermal clutch http://www.amazon.com/Hayden-Automot..._dp_o_pC_S_ttl Hope this helps
just checked. This does not work with the electric fans in the wrangler. Don't know if a secondary electric fan would help. Years ago there were some cars, not jeeps, with electric fans that were wired backwards. They tried to blow the air from the engine compartment out the front. Did not work good at highway speeds. And yes, I've checked mine to make sure it's going in the proper direction.
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Old 06-07-2016, 07:13 AM   #12
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want in on a little known gem in the 3.8l JK/JKU world ?
As well all know, heat is the sole killer of powerplants and trannys. I am utterly OCD about my rig staying cool - I installed a plate B&M aux tranny cooler the 2nd day I had my '11 new - and to maintain highly effective cooling, I run 14" Synergy Mfg hood louvers as well as this bad boy:
2007-2011 Jeep Wrangler JK Spal Fan Upgrade - Universal Parts Inc. | High Performance Automotive Cooling | Humboldt, IA

I monitor my engine coolant temps and they never exceed 195 to 198 degrees <edit: even in hottest of SE USA summer while crawling 6 hrs then driving home a few hours>with that monster Spal fan moving 4 times the air that the OEM fan and shroud does.
A great upgrade.

For the interim, have you verified that no years worth of mud or debris has your radiator fins clogged-up? After wheeling in dirty areas or mud, I blow it from the engine bay outward till she runs clean.

Other than that, you may have a water pump issue BUT ( lastly) the first troubleshooting step is the verify the little 16psi rad cap isn't shot. The gasket on those wears out and you will hear bubbling and the coolant evaporates and makes noises as you describe.

good luck & hope that helps

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Old 06-08-2016, 10:10 AM   #13
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It would fit

Quote:
Originally Posted by Kraxler View Post
just checked. This does not work with the electric fans in the wrangler. Don't know if a secondary electric fan would help. Years ago there were some cars, not jeeps, with electric fans that were wired backwards. They tried to blow the air from the engine compartment out the front. Did not work good at highway speeds. And yes, I've checked mine to make sure it's going in the proper direction.
The Fan with thermal clutch is screwed on the water pump end and assists the electric fan in cooling the engine. My 2008 Unlimited Wrangler Sahara is fitted with one, and my gauge never crosses the middle !!
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Old 07-13-2016, 09:25 AM   #14
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Still have the problem with my 2012 JKUR. Driving from Albuquerque to Silverton on 550 going up to coal pass with the air temp about 75 temp on gauge went up to the 3/4 mark and the temp on the Traildash up to 248. Way too high. At that temp the exam throttles back to keep things from self destruction. Over the past year have put on a new Mishimoto radiator, system flushed, new cooling fan with controler. Also replaced the thermostat. Just before the trip installed a new Rock Hard front bumper that lowered the Warm winch out of the airflow. Also have washed the various radiators out front with lots of water.

Don't know what the problem could be. Just ordered some smallish fans to mount in front of the radiators to help push air through. Could there be a problem with the water pump"

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Old 07-13-2016, 09:27 AM   #15
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Old 07-13-2016, 11:25 PM   #16
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You seem to have done all could be done to control the engine temp. If you don't see/hear the water boiling in the Water Container, it then could be a faulty Temp Sensor.
The signal received by the gauge as well as by the Tridash comes via the same Temp Sensor... I don't see another reason otherwise.
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Old 07-13-2016, 11:49 PM   #17
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not normal i run at less then half to half on temp gauge and im in az. even slow trail rides in 4x4 it doesnt go over half. if you hear bubbling its overheating. u may have a stuck thermostat or your fan is not kicking on.
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Old 07-14-2016, 02:11 PM   #18
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Fan and controler as well as the thermostat are new. Fan is kicking on.

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Old 07-14-2016, 02:37 PM   #19
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Quote:
Originally Posted by Kraxler View Post
just checked. This does not work with the electric fans in the wrangler. Don't know if a secondary electric fan would help. Years ago there were some cars, not jeeps, with electric fans that were wired backwards. They tried to blow the air from the engine compartment out the front. Did not work good at highway speeds. And yes, I've checked mine to make sure it's going in the proper direction.
Corvettes use two fans, a push fan in front of the radiator and the pull fan on the back of the radiator. I'd do a little research. The aftermarket push fan can be programmed to come on before the stock fan, at lets say 205F. It's certainly worth looking into. Be sure your radiator is good, burped, the OE fan is working properly, and your thermostat is good. If you replaced the thermostat hopefully you used an OE thermostat, aftermarket thermostats can be hit or miss at best.
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Old 07-14-2016, 04:19 PM   #20
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It's an OEM thermostat. Radiator is a new Mishimoto one that's .5 in deeper than stock. System flushed and burped. Just ordered some aux fans that I'll install as pushers. Plan is to mount them directly to the AC condenser to blow through the condenser and radiator. The transmission stays nice and cool. Max I've seen is 175. Will also have to check into replacing the temp sensor. So frustrating.


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Old 07-15-2016, 01:05 AM   #21
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maybe the sensor is bad and reading wrong? could need a water pump too.
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Old 07-16-2016, 04:36 AM   #22
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Quote:
Originally Posted by Kraxler View Post
It's an OEM thermostat. Radiator is a new Mishimoto one that's .5 in deeper than stock. System flushed and burped. Just ordered some aux fans that I'll install as pushers. Plan is to mount them directly to the AC condenser to blow through the condenser and radiator. The transmission stays nice and cool. Max I've seen is 175. Will also have to check into replacing the temp sensor. So frustrating.


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I've mentioned it a few times and like the push fan idea a lot. Let us know how that works out for you.
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Old 12-06-2016, 09:52 AM   #23
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Ok, a slightly different tack. Oil cooler? I know there is an oil cooler built in with the oil filter but what about an external oil cooler? I was talking to a college yesterday and on a non jeep vehicle he lowered the cooling temperature by 15 or so degrees just by installing an oil cooler. Anyone know of an aftermarket solution? Would this help? Thoughts?
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Old 12-30-2016, 08:19 AM   #24
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Got it back from dealer. Had them install the OEM radiator after the 2day old replacement radiator (warranty) from Mishimoto started to leak from one of the unused nipples on the back side. So disappointed with Mishimoto. Also it seems that the Traildash 2is inter fearing with the fan controller. With it installed the cooling fan came on at 157 and off at 175 but not at the higher temp when it should. When set back to stock and removed the fan comes on when it should at 220. I don't think any of this will address my high temp issue but we will see. Now to contact Mishimoto and Superchip. Urgggg.
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Old 01-11-2017, 12:18 PM   #25
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Quote:
Originally Posted by Kraxler View Post
Got it back from dealer. Had them install the OEM radiator after the 2day old replacement radiator (warranty) from Mishimoto started to leak from one of the unused nipples on the back side. So disappointed with Mishimoto. Also it seems that the Traildash 2is inter fearing with the fan controller. With it installed the cooling fan came on at 157 and off at 175 but not at the higher temp when it should. When set back to stock and removed the fan comes on when it should at 220. I don't think any of this will address my high temp issue but we will see. Now to contact Mishimoto and Superchip. Urgggg.
Hey Kraxler,

THank you for the post.

We sincerely apologize for what has happened. We hope that you have contacted us so we can resolve any issues you may be having. If not, please contact us at Support@Mishimoto.com so we can work to correct any issues.

Best Regards,
Mishimoto
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Old 01-11-2017, 02:27 PM   #26
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those of you that have the 3.6 pentastar with heat problems, try removing the engine cover. I have read posts of some saying the cover keeps the heat in the engine.
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Old 01-11-2017, 08:49 PM   #27
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Quote:
Originally Posted by Mishimoto View Post
Hey Kraxler, THank you for the post. We sincerely apologize for what has happened. We hope that you have contacted us so we can resolve any issues you may be having. If not, please contact us at Support@Mishimoto.com so we can work to correct any issues. Best Regards, Mishimoto
I have been in contact. The second replacement radiator is now in the mail. Hope this one does not leak.

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