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Old 10-30-2013, 04:50 PM   #1
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07 with 35's Overheating on HWY

I just bought a used 07 JKU with 61000miles. It's a 6spd with 35's and has a lift HD bumper's and run's hot on Hwy at 65-80 mph. I got the Temp light last night and went and picked up a new 195*thermostat, Rad cap and I powerwashed rad out to remove alot of gunk and mud from fin's from previous owner. So after that I check coolant and it tested two strong so I watered it down some did install of new parts and now it's just shy of the overheat point (one line above half) on temp guage?

I'm new to this Jeep game is the tire's the cause of the overheat or should I look else where?

I cruz at half way point on gauge around town , once I hit Hwy speed for longer then 5min's it get's hot and outside temps are cool say 40-55* on dash reading..

Cooling fan work's fine and I saw steam from rad when new thermostat opened..

anyone??

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Old 10-30-2013, 11:44 PM   #2
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Bump drained Rad again tested strenght and adjusted it was to strong. I added a bottle of water wetter. Noticed it never went past half way mark idle in driveway even with fan running on slow speed. After 15min's idle it went to Hi fan speed .I will drive it some tomorrow and see what it does?

No one here have an issue's running big 35"meat's and getting hot?

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Old 10-31-2013, 02:12 AM   #3
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Dont think your tires size has anything to do with your overheating problems.Would take a good look at water pump and rest of cooling system .
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Old 10-31-2013, 04:23 AM   #4
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Quote:
Originally Posted by RTChas View Post
I'm new to this Jeep game is the tire's the cause of the overheat or should I look else where?

I cruz at half way point on gauge around town , once I hit Hwy speed for longer then 5min's it get's hot and outside temps are cool say 40-55* on dash reading..

Cooling fan work's fine and I saw steam from rad when new thermostat opened..

anyone??
Clogged radiator... install a new one and the problem should disappear.

If you go aftermarket, don't be fooled with claims of increased number of rows, etc. It's not the number of rows but the ability to dissipate heat and that means the size diameter of the tubes X number of rows.

You can only get a radiator in there that fits between the radiator support and the fan - including the shroud. Many companies either decrease the diameter of the tubes and increase the number rows or reduce the number of rows and increase the diameter of the tubes.

Most OE's are made with plastic tanks and aluminum tubes and fins... Maybe the JK is different - I haven't looked at mine since it only has 4,000 miles.

You want to spend money? Install a Griffin... but remember the tube diameter X number of rows scenario.

After all my research on aftermarket radiators, I stayed with OE.

Good luck.

.
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Old 11-01-2013, 12:41 AM   #5
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Originally Posted by ohioviper View Post
Dont think your tires size has anything to do with your overheating problems.Would take a good look at water pump and rest of cooling system .
Ok never had 35's on anything and it's alot of mass for this v6..lol

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Clogged radiator... install a new one and the problem should disappear.


.
I was thinking it might be the case.

Thank's for the reply's Guy's
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Old 11-01-2013, 01:08 AM   #6
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I was thinking it might be the case.
My 1991 did the same exact thing... but it didn't start that until I reached 120K miles. However the coolant got flushed every 30K.

I can't recall the OE that made radiators for Jeep in the '90's... I talked to one of their engineers and learned more than I'll ever need to know about radiators and the fallacies.

However, number rows and tube diameter from the HD radiator that came on my Jeep was the reason I installed an OE. Big thread about this on NAXJA.

Good luck.

.
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Old 11-01-2013, 01:47 AM   #7
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This was and probably still is the OE for Jeep...

Modine..

Modine - Home

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Old 11-02-2013, 11:21 AM   #8
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Originally Posted by m998dna View Post
This was and probably still is the OE for Jeep...

Modine..

Modine - Home

.

I was leaning toward clogged rad, however the heater core would be clogged some too. NO? I get killer heat all the time and right away in the morning.I've been told Jeep heaters are Great by friend's who own. I can leave it idle for long time and it stay's in the middle of the gauge once I drive it around it hoover's around the line above the middle and again yesterday after leaving traffic and heading down a rual road it went up and temp light flashed on! I quickly turned on heat full blast and within two miles it was back down just above half mark. Outside temp said 71* at that moment and I was doing 45mph.
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Old 11-02-2013, 11:42 AM   #9
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I know it's a different animal so not sure if helpful but my Mustang overheated - not sure if it was cause or effect but Ford told me my thermostat housing blew up.
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Old 11-02-2013, 12:11 PM   #10
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If you do not know the condition of your water pump it would be worth your time to pull it and replace it.Ive seen some that the impeller was half gone have symptoms like your having.It not a bad job on the 3.8. I just put one in my Daughters Nitro few weeks back .Her 3.8 had 47k miles and had similar issues but before I could take a look at the pump it let go.
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Old 11-02-2013, 12:19 PM   #11
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Quote:
Originally Posted by RTChas View Post
I was leaning toward clogged rad, however the heater core would be clogged some too. NO? I get killer heat all the time and right away in the morning.I've been told Jeep heaters are Great by friend's who own. I can leave it idle for long time and it stay's in the middle of the gauge once I drive it around it hoover's around the line above the middle and again yesterday after leaving traffic and heading down a rual road it went up and temp light flashed on! I quickly turned on heat full blast and within two miles it was back down just above half mark. Outside temp said 71* at that moment and I was doing 45mph.
I don't know... I imagine it can. I guess turning on the heater allows trapped heat to dissipate into the cab.

I kinda look at it like this.. you already installed a new thermostat. If it was your water pump you would know it - obviously the cooling comes from liquid being circulated through the radiator. Maybe fine at idle, but as soon as you increase flow it backs up like a clogged drain.

If its clogged like a pipe it will back up and overheat because it can't flow.

That was my experience.. Idle it was fine, as soon as I jumped on the freeway the temp rose way beyond normal - and I still have my original heater core with 180K miles.

.
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Old 11-02-2013, 12:23 PM   #12
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Originally Posted by ohioviper View Post
If you do not know the condition of your water pump it would be worth your time to pull it and replace it.Ive seen some that the impeller was half gone have symptoms like your having.It not a bad job on the 3.8. I just put one in my Daughters Nitro few weeks back .Her 3.8 had 47k miles and had similar issues but before I could take a look at the pump it let go.
Yeah... Didn't think of that, impeller could be chewed up. Normally the bearing goes first and makes a bunch of noise.

Although if the impeller disintegrated in small particles it went somewhere.

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Old 11-03-2013, 11:26 AM   #13
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I got it!

Soooo I feel stupid!

First night driving I went and looked at rad as best I could in the dark with cell for light. I saw some crap caked on the fin's behind the cooling fan, I went home sprayed it out as best I could from the front. Well I missed a little! OK I MISSED ALOT of mud and crap smashed in to every inch of the rad!! I removed the fan yesterday then unbolted the rad and here is what I found!



Noob mistake! Thank's Guys for the help! I was really getting bummed having just bought this thing and needing repair so soon. My guess the previous owner could not solve the over temp issue and traded it in because of it. Looking down into the engine bay with the fan intact you'll never see all of this clogged mess.

Now I drove 1hr last night on back road's in 6th gear and traffic and NEVER went past half way mark!! I'm so glad I got it licked now I can trail it and not worry about overheating.
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Old 11-03-2013, 11:39 AM   #14
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Really glad to see you were able to solve this problem with a little elbow grease and some process of elimination. Enjoy.
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Old 11-04-2013, 09:44 PM   #15
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Really glad to see you were able to solve this problem with a little elbow grease and some process of elimination. Enjoy.
That makes two of us, I was starting to thimk I bought a Lemon...

Now I'm enjoying it to the fullest!!! Drove around for 2hr's yesterday and found a good pile of dirt to "test" it in



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