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Topic Review (Newest First)
08-01-2013 09:21 AM
ninjaturtle0
Quote:
Originally Posted by Jerry Bransford View Post
You can't get the radiator cap out of the opening? And open the hood before you kill the engine so you can listen for what is hissing when a helper shuts the engine off. My guess is the hissing is from the radiator cap leaking... if so, it needs to be replaced with a new 18 lb. cap.
I had to get to work I ran out of time but thew my Jeep in the garage and took the truck today. I'll check when I get off regarding the hissing.
08-01-2013 09:17 AM
Jerry Bransford You can't get the radiator cap out of the opening? And open the hood before you kill the engine so you can listen for what is hissing when a helper shuts the engine off. My guess is the hissing is from the radiator cap leaking... if so, it needs to be replaced with a new 18 lb. cap.
08-01-2013 09:11 AM
ninjaturtle0
  • Quote:
    Originally Posted by Jerry Bransford View Post
    Sounds like maybe the radiator cap is leaking pressure. Is it screwed all the way down? If it is and it's leaking pressure prematurely, replace it with a new cap with the correct 18 lb. pressure rating.
checked this morning and it was screwed all the way down and when I unscrewed it I couldn't pull it off

another thing I notice is after I turn my Jeep off there is a hissing sound coming from the engine when I'm outside the Jeep like the its releasing pressure, it lasts for a few seconds and then its gone.
07-31-2013 10:30 PM
ninjaturtle0
Quote:
Originally Posted by Jerry Bransford View Post
Sounds like maybe the radiator cap is leaking pressure. Is it screwed all the way down? If it is and it's leaking pressure prematurely, replace it with a new cap with the correct 18 lb. pressure rating.
Thanks Jerry I will check it in the morning and maybe replace it
07-31-2013 09:24 PM
Jerry Bransford Sounds like maybe the radiator cap is leaking pressure. Is it screwed all the way down? If it is and it's leaking pressure prematurely, replace it with a new cap with the correct 18 lb. pressure rating.
07-31-2013 09:17 PM
ninjaturtle0 Recently my Jeep has been running slightly over 210 and today I punched hard on the highway to gain speed and my rpm was over 3k and I watched the temp go up and it almost hit that white dot that measures 3/4 mark before the red area. And when I shut my jeep off and walk to the front of the hood I can hear a hard boiling sound :/

Last summer my Jeep didnt do this. And I had someone tell me that's normal in tx... I had my coolant flushed about 9 months ago

Any suggestions?
07-29-2013 01:20 AM
jeepwayoflife
Quote:
Originally Posted by Kewrock View Post
It's the oposite. High octane burns hot and fast and leaves less deposits. High octane in yard equipment burns hot enough to melt small aluminum pistons. It's the higher alcohol content. High octane does not store as long as regular before separating and turning to "varnish", and breaks down 2-stroke oil. So don't use it in your chainsaws and weed eaters.
I don't know about burning "hot and fast", but I do know higher octane fuel is harder to ignite or withstands more pressure before combustion.

This article helps describe the roll heptane and octane play in gas: HowStuffWorks "What does octane mean?"

The higher the number, the more octane is in the gas and the more pressure the gas is able to withstand without combusting.


If your engine is unable to burn all the fuel because you are putting in gas that cannot be fully ignited with the compression your engine creates, it will leave behind deposits.

07-29-2013 01:18 AM
Majnoon
Quote:
Originally Posted by Kewrock View Post

It's the oposite. High octane burns hot and fast and leaves less deposits. High octane in yard equipment burns hot enough to melt small aluminum pistons. It's the higher alcohol content. High octane does not store as long as regular before separating and turning to "varnish", and breaks down 2-stroke oil. So don't use it in your chainsaws and weed eaters.
It's not the opposite. It's what Jerry said. High octane burns slower. Which is why it is used in high compression engines. You really think a more explosive gas would REDUCE pinging I'm a high compression engine that calls for high octane? I used to buy that crap when I was young and dumb for my Jeep. We only run it in the hemi ram that calls for it. Use the cheap high explosive stuff in my 4.0.
07-29-2013 12:03 AM
Kewrock
Quote:
Originally Posted by Jerry Bransford View Post
X3 on 210 being where your engine should be operating at, keep the factory specified 195 degree thermostat in place. And the same goes with staying with 87 octane as your engine was designed for. Not only is a higher octane a waste of $$$, a higher octane can actually make your engine run worse. The higher the octane, the harder it is to ignite, the slower it burns, and the more likely it is likely to leave deposits behind since a high octane fuel is harder/slower to ignite when compared to 87 octane.
It's the oposite. High octane burns hot and fast and leaves less deposits. High octane in yard equipment burns hot enough to melt small aluminum pistons. It's the higher alcohol content. High octane does not store as long as regular before separating and turning to "varnish", and breaks down 2-stroke oil. So don't use it in your chainsaws and weed eaters.
07-28-2013 07:04 AM
GreenTJ4JC
Quote:
Originally Posted by 1jeeplvr View Post
Id keep it,it is a Jeep
Like Bransford says, if this thing had been properly maintained I'm sure the first one would never have gone bad. I'm just pleased that I pressed on to find the 'root cause' rather than accepting that warm is OK as long as it's not in the red. Eventually it probably would've gotten to that point.
07-27-2013 04:09 PM
Jerry Bransford
Quote:
Originally Posted by 1jeeplvr View Post
Id keep it,it is a Jeep
In the five Jeeps I have owned since 1988, I have replaced a total of one radiator. Several of those Jeeps had high mileages, one had 192k miles on it. Properly cared for, the OE radiator will last longer than most people keep their Jeeps.
07-27-2013 04:04 PM
1jeeplvr
Quote:
Originally Posted by capsfan2013 View Post
I read your entire thread yesterday! That is damn impressive you figured it out how you did. Congrats man. Job well done. The two radiator thing is kinda hilarious, but now you have one to sell for sure!
Id keep it,it is a Jeep
07-27-2013 07:09 AM
capsfan2013
Quote:
Originally Posted by GreenTJ4JC View Post
I wound up with two new radiators. One's in the TJ. The other's posted on the 'for sale' thread.
I read your entire thread yesterday! That is damn impressive you figured it out how you did. Congrats man. Job well done. The two radiator thing is kinda hilarious, but now you have one to sell for sure!
07-27-2013 07:07 AM
capsfan2013
Quote:
Originally Posted by KaiserJeep View Post
I cringe when people say they destroyed a vehicle by overheating. There are so many clues. The temperature gauge, the way it smells, the steam, etc.

When an engine overheats, don't keep driving. Pull over as soon as you can, and fix it. Meaning: stop the leak, tape the busted hose,refill with coolant - or plain water in a pinch - and DO NOT let the engine overheat. You will blow a gasket or hose at least, you might crack a block or do other serious damage.

If you cannot fix it, have it towed. Just don't drive it.
Did not mean for it to happen obviously. I had no signs. The tranny was bad and I did not even know it at the time. I was driving down to VA Beach and the transmission went out. Saw the white smoke and it happened.

Trust me. I now know what the signs are. And you are definitely right, it is a crime to see it happen. I miss my 5.2L V8 Grand Cherokee.
07-27-2013 12:23 AM
SurfKaster 210 TJ Ok
07-26-2013 05:21 PM
1979WagoneerLTD iPhone typos, gas, has, etc.
07-26-2013 05:20 PM
1979WagoneerLTD
Quote:
Originally Posted by KaiserJeep View Post
I cringe when people say they destroyed a vehicle by overheating. There are so many clues. The temperature gauge, the way it smells, the steam, etc.

When an engine overheats, don't keep driving. Pull over as soon as you can, and fix it. Meaning: stop the leak, tape the busted hose,refill with coolant - or plain water in a pinch - and DO NOT let the engine overheat. You will blow a gasket or hose at least, you might crack a block or do other serious damage.

If you cannot fix it, have it towed. Just don't drive it.
This is an anxiety that had concerned many a TJ'er. While there has been documented issued with cracking cylinder heads et al, chances are you're fine per some of the previous posts. If in doubt, use an infrared thermometer to verify, even beyond the coolant temp sensor feedback to the PCM, that you're temp is not spiking. If you want to be totally sure, buy a coolant test kit from Strap on (or Marco /Mac) and verify you have combustion has present on the coolant.
07-26-2013 04:17 PM
KaiserJeep I cringe when people say they destroyed a vehicle by overheating. There are so many clues. The temperature gauge, the way it smells, the steam, etc.

When an engine overheats, don't keep driving. Pull over as soon as you can, and fix it. Meaning: stop the leak, tape the busted hose,refill with coolant - or plain water in a pinch - and DO NOT let the engine overheat. You will blow a gasket or hose at least, you might crack a block or do other serious damage.

If you cannot fix it, have it towed. Just don't drive it.
07-26-2013 01:18 PM
GreenTJ4JC I wound up with two new radiators. One's in the TJ. The other's posted on the 'for sale' thread.
07-20-2013 08:24 PM
capsfan2013 210 is absolutely normal. It is 95 degrees here in Maryland and 105 with heat index and might run a fraction over 210 for a few minutes if pushing the engine hard, otherwise, 210 is absolutely normal. Not to worry!

Had a 94 Grand Cherokee that overheated and destroyed my transmission, 2000 dollars later and had that replaced. In general, just keep an eye on your temp gauge, but you should be fine. You are right where you are supposed to be.
07-20-2013 07:13 PM
kawzak Wow, this one is still going. For one thing the coolant along increses boiling point. Now I don't remember the formula-but- for every pound of pressure (rad cap) The water/coolant obtains an even HIGHER boiling point. The water at 240f is still not boiling. Someone look in a psyhics book for me. Maybe we can help others feel OK about higher temps. FWIW many factory cars have or did have 210 thermostats.So just because water in a pot boils at 212f-your radiator is not. (Maybe if you ran straight water and no radiator cap). Never tried it-no point. My 98 4.0L runs at or above 210f when hot and A/C on at times. No big deal.
07-20-2013 05:43 PM
GreenTJ4JC
Quote:
Originally Posted by UnlimitedLJ04 View Post
I just replaced the water pump, radiator, fan clutch and hoses. Thermostat, cap and thermo housing have all been replaced previously. There was no corrosion, no clogs, great flow and actually nothing needed replaced....100k miles on the clock. Overheating issues had been present since basically new (when running A/C only), and the dealership couldn't figure it out.

I only run the A/C intermittently and watch the temps from the Scangauge to keep things in check. As long as I watch things while using the A/C, I don't come anywhere close to overheating.
You've certainly done it all. wow! Hey, do you have a link to the scangauage? Does it just plug into the plug at the bottom of the dash?
07-20-2013 12:37 PM
UnlimitedLJ04
Quote:
Originally Posted by GreenTJ4JC View Post
Based on my recent experience, you may wanna take a peek in the top of your radiator core. If you see the "sandpaper" corrosion I had in mine, might be worth while to swap out radiators and see if anything changes. Just a thought...
I just replaced the water pump, radiator, fan clutch and hoses. Thermostat, cap and thermo housing have all been replaced previously. There was no corrosion, no clogs, great flow and actually nothing needed replaced....100k miles on the clock. Overheating issues had been present since basically new (when running A/C only), and the dealership couldn't figure it out.

I only run the A/C intermittently and watch the temps from the Scangauge to keep things in check. As long as I watch things while using the A/C, I don't come anywhere close to overheating.
07-20-2013 11:50 AM
GreenTJ4JC
Quote:
Originally Posted by UnlimitedLJ04 View Post
x2...
my experience has been the dash gauge shows "about 210°", but the actual real time temps via the Scangauge may be anywhere between 185-235°. That's a 50° temp variance you can't see on the dash. After the temps climb to ~240°, the dash guage starts moving but by that time the motor is overheating out of control and the gauge quickly pegs over at 260°F. By the time it's too late to do anything about it.
Based on my recent experience, you may wanna take a peek in the top of your radiator core. If you see the "sandpaper" corrosion I had in mine, might be worth while to swap out radiators and see if anything changes. Just a thought...
07-20-2013 10:43 AM
UnlimitedLJ04
Quote:
Originally Posted by OhSixTJ View Post
I've been saying this for a while. Any temperature from 210-230 has the needle sitting between the 1 and the 0 in 210.
x2...
my experience has been the dash gauge shows "about 210°", but the actual real time temps via the Scangauge may be anywhere between 185-235°. That's a 50° temp variance you can't see on the dash. After the temps climb to ~240°, the dash guage starts moving but by that time the motor is overheating out of control and the gauge quickly pegs over at 260°F. By the time it's too late to do anything about it.
07-20-2013 10:11 AM
KBR97 My gauge always reads right around 200.
07-19-2013 07:33 PM
TJZ My TJ lives at 210. Never goes above that and it's 110 degrees out now. It was 118 a couple weeks ago and it never went above 210. Oh, I'm in AZ. Or Hell as we like to call it.
07-19-2013 06:45 PM
GreenTJ4JC
Quote:
Originally Posted by OhSixTJ View Post
How about you post the link here?
show me how, obie-whan kenobe! That'd be the better way, to be sure!

Hey, maybe I got it!

http://www.wranglerforum.com/f5/tj-r...rm-239881.html
07-19-2013 06:44 PM
GreenTJ4JC I can't tell if this posted up or not. If it did, sorry for the duplicity -
Anyhow, I finally got the TJ running like its old self. Please see my full update in my thread "TJ Running Warm."
07-19-2013 06:43 PM
OhSixTJ
Quote:
Originally Posted by GreenTJ4JC View Post
I've found the problem. The TJ is back to its old self! For full explanation please see my update on my thread "TJ running warm."
How about you post the link here?
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