TJ Overheated... - Page 2 - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-23-2013, 03:55 PM   #31
Jeeper
 
Join Date: Dec 2010
Location: So Cal 805
Posts: 915
It must be a White Jeep thing. My daughter took my Jeep this morning to go cross country running and she rolled into the driveway yelling " Dad!! There is smoke coming out of the hood!!" I ran out, smelt the coolant so slowly opened the hood. Thought it was my radiator, brass unit I am getting ready to replace as it has been taken out, rodded and resolderd but still has a pinhole leak. It turned out the heater hose split at the hose clamp on the water pump. Cut off 1" of hose and put it back on until my radiator gets orderded and new hoses go on. I replaced the other hoses last summer and these two were scheduled to go on this summer, so good timing.
A trick I use when filling my Jeep cooling system is to elevate the front end, fill through top radiator hose, attach hose when topped off, then run it while adding coolant to radiator if needed.

Xjman1 is offline   Quote Quick Reply
Old 06-23-2013, 05:57 PM   #32
Jeeper
 
jherrington's Avatar
 
Join Date: Jan 2012
Location: Baton Rouge
Posts: 1,838
just take the top off of your radiator, and let it idle. the level of coolant should slowly drop, continue adding until this stops. do NOT, hit the gas. it will cause coolant to go everywhere.

__________________
98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
jherrington is offline   Quote Quick Reply
Old 06-24-2013, 08:51 AM   #33
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
I've done that. I still have an external leak somewhere when the radiator cap is on.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 06-24-2013, 09:57 AM   #34
Jeeper
 
Evpjr's Avatar
 
Join Date: May 2012
Location: Bakersfield
Posts: 202
Images: 1
How often do you have to add coolant? Does it blow coolant out of the overflow while at highway speeds? These are good indicators of a blown head gasket, or a malfunctioning thermostat. The water pump will leak or make noise, or the shaft have lateral movement. can you wiggle the water pump shaft? If you can then it is bad.
Evpjr is offline   Quote Quick Reply
Old 06-24-2013, 10:01 AM   #35
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
No noise and I haven't made it much past 2 miles before coolant goes everywhere. I'm going to look at it again tonight, had no power last night due to storms.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 06-24-2013, 10:10 AM   #36
Jeeper
 
Evpjr's Avatar
 
Join Date: May 2012
Location: Bakersfield
Posts: 202
Images: 1
How often do you have to add coolant to the radiator? If it's not the t-stat and the water pump is good, then it is a good bet it is a blown head gasket between cylinders. Hope not so do a compression test first, and see if you have pressure loss between cylinders.
Evpjr is offline   Quote Quick Reply
Old 06-24-2013, 10:20 AM   #37
President, ThumbJeeps

WF Supporting Member
 
sevenservices's Avatar
 
Join Date: Sep 2009
Location: Mid-Michigan/Thumb
Posts: 3,937
Aside from all the suggestions, I would switch from a 210 thermostat to a 185. My I6 likes it a lot better at 185 then it did my couple years at 210 until my water pump died. Could be your water pump as well... Disconnect the belt from it, spin it by hand. Make sure it spins feely and easily without grinding at all.

My telltale sign was antifreeze slowly dripping out the bearing on the front of the water pump where the fan hooks up.
__________________
-Chris
President, ThumbJeeps
CB Callsign "AirForce One"


1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 4" RC (33x12.5) (15x8) 3:54 Gears
sevenservices is offline   Quote Quick Reply
Old 06-24-2013, 11:55 AM   #38
Jeeper
 
jherrington's Avatar
 
Join Date: Jan 2012
Location: Baton Rouge
Posts: 1,838
Quote:
Originally Posted by sevenservices View Post
Aside from all the suggestions, I would switch from a 210 thermostat to a 185. My I6 likes it a lot better at 185 then it did my couple years at 210 until my water pump died. Could be your water pump as well... Disconnect the belt from it, spin it by hand. Make sure it spins feely and easily without grinding at all.

My telltale sign was antifreeze slowly dripping out the bearing on the front of the water pump where the fan hooks up.
It should be a 195 thermostat..
__________________
98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
jherrington is offline   Quote Quick Reply
Old 06-24-2013, 09:08 PM   #39
Jeeper
 
Join Date: Dec 2010
Location: So Cal 805
Posts: 915
Remove the oil fill cap, what color is it on the inside of it? Black normal, cream color and you have a head gasket issue. Also, check dip stick for water in oil pan. You would also see same cream color under radiator cap.

When it overheats, it looks as if steam is under the hood, where is this steam coming from? Mine looked like it was spewing out of radiator in shroud but after rinsing it down with a very fine mist of water, i found it to be a rip in the heater hose at the thermostat housing. I lost almost a full gallon out of the cooling system in very short time as daughter said it started steaming when she hit driveway.

Also, PM'd you my number to try and help as it may be easier than all the typing. lol
Xjman1 is offline   Quote Quick Reply
Old 06-24-2013, 10:29 PM   #40
Newb
 
Join Date: Apr 2013
Posts: 5
The temp gauge spiking makes me think there is air in the system. There seems to still be another issue. But if the temperature is ok for a little and then all of a sudden it spikes. That makes me think your temp. sensor hit a air pocket. I am having a similar issue, not as severe. It has always run warmer than I am comfortable, around 220. Has a 195 degree thermostat. The only two times it hit red was in a strong crosswind. But not head wind? Mine would leak around the cap, so I have replaced it and burped the system and changed the thermostat just to be safe.
cue2671 is offline   Quote Quick Reply
Old 07-13-2013, 05:36 PM   #41
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
I was so stumped, I ended up taking it to Auto Tire here in town. The radiator cap wasn't sealing correctly, so they replaced that. They thought maybe the thermostat was stuck closed, but actually it was working just fine. I had them flush the cooling system. It behaved for them, but I got 2 miles out and it pegged the gauge again. Brought it back to them and they put a laser tach on it. It's not over heating, so in the morning I'm going to replace the temp sensor and see if that fixes it.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-14-2013, 04:28 PM   #42
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
I replaced the temp sensor and same issue. I then back flushed the heater core and a bunch of junk came out if it. Buttoned it all back together, burped the radiator, drove it down the street and it pegs the needle again.

What am I missing?

Another thought, my heater doesn't work due to the switch plug being a little melted. How can I get my heater to turn on so I can completely burp my system?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-14-2013, 06:31 PM   #43
Jeeper
 
jherrington's Avatar
 
Join Date: Jan 2012
Location: Baton Rouge
Posts: 1,838
Your heater doesn't adjust the flow of coolant.
__________________
98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
jherrington is offline   Quote Quick Reply
Old 07-14-2013, 06:59 PM   #44
Jeeper
 
Join Date: Jun 2013
Posts: 219
You still need to verify coolnt is flowing good VIA water pump. However many times lots of bubbles in the radiator indicate that exhaust is pushing into the coolant system. Shops have a chemical tester that fits in place of the cap to suck air out of the radiator while running. if it turns the blue fluid to green-exhaust gas in in the cooling system. If you pull the head-it can be hard to find where the problem is happening at. Some times a crack in an exhaust valve pocket instead of the gasket. Be sure to have the head checked with a straight edge, and have the head magna-fluxed for cracks, you have to remove all valves for this check. Some times you can get lucky and after pulling each spark plug the you might fine a really clean one where the coolant is leaking back into the cylinder after you turn engine off. At least you know which cylinder the problem is at. Is you oil "milky" or is it milky inside your oil filler cap? Another indication coolant is leaking past a head gasket.
kawzak is offline   Quote Quick Reply
Old 07-15-2013, 08:23 AM   #45
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
The oil looks fine, as well as the coolant. Per a laser thermometer, the jeep is running where it should be, but the gauge will jump from 212║ to 240║ then to 260║ just like flipping a switch... not gradually.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 08:48 AM   #46
Jeeper
 
Join Date: Feb 2012
Location: NW Connecticut
Posts: 31
If you're adding any coolant then it's going somewhere? External leak or into the cylinders? One of the other imo........... So you replaced the cap that was a problem and the IR gun is showing operating temps ok? If you are 100% sure the engine is operating within specs it can't be anything else but the sensor or gage? At least neither is expensive or a difficult replacement.

I would urge you to just be "SURE" it's really "FOR SURE" running within "normal operating temps".... If you cook the engine you're looking at more then just some head work......... more like a nice jeep anchor!

The instant temp spikes would make me believe it's a sensor or gage problem. Even without ANY coolant you wouldn't see "instant" temp spikes imo. I have a super charged vette. Coolant and even unhood air temps are very critical to avoid nasty things happening very fast. Timing is predicated (advanced or retarded) on those parameters! I have special gages to monitor and "enunciate" should those temps exceed my preset parameters. I do all my own programing for the engine and that's one thing you had better not screw up!

If you're 100% sure the engine is NOT over heating, boiling over, coolant is clean, oil is not contaminated then it's most likely faulty gage/sensor causing the problem.
__________________
NW Connecticut
cthusker is offline   Quote Quick Reply
Old 07-15-2013, 09:11 AM   #47
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
I haven't added any coolant since the cap was replaced. It's also not boiling over into the overflow tank. Will the computer see the correct temp if the gauge is faulty? I installed a new temp sensor and it's reading the same "jump" in temp. The gauge is part of the cluster, I assume I'd have to replace the whole cluster?

Top of Radiator 130║
Water Jacket 238║
Water Neck 212║
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 10:35 AM   #48
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
Those temps were while the gauge was pegged out at 260║.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 11:29 AM   #49
Jeeper
 
Join Date: Feb 2012
Location: NW Connecticut
Posts: 31
Quote:
Originally Posted by WingingIt74 View Post
Those temps were while the gauge was pegged out at 260║.
I think you're right on replacing the entire cluster! I think mileage is kept in the cluster so if you get another used one it's going to read whatever it had when it was taken out?

Sounds like a loose wire or a short.. since the gauge jumps around with temp readings! Can't see how it could be anything but gauge/sending unit/sensor issue since you've proven the actual temps are operating ok!

There are several places on ebay that sell used clusters but I have no idea as the pricing....
__________________
NW Connecticut
cthusker is offline   Quote Quick Reply
Old 07-15-2013, 12:04 PM   #50
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
Yes and no... It jumps from 212 to 240 then jump to 260, or just 212 to 260 but it's slow to come back when the engine is off. It acts like it's reading correctly, except for the quick jump. Turning the engine off, it will cool down... come to think of it, when it cools down it has nearly the same jump. I wonder if it isn't the gauge? Could it be a short in the gauge?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 12:12 PM   #51
Jeeper
 
Join Date: Feb 2012
Location: NW Connecticut
Posts: 31
Quote:
Originally Posted by WingingIt74 View Post
Yes and no... It jumps from 212 to 240 then jump to 260, or just 212 to 260 but it's slow to come back when the engine is off. It acts like it's reading correctly, except for the quick jump. Turning the engine off, it will cool down... come to think of it, when it cools down it has nearly the same jump. I wonder if it isn't the gauge? Could it be a short in the gauge?
Was wondering the same! Anyway to get your hands on another gauge just to check? I think it's only a 2 pin type which shouldn't be hard to find. Even if the calibration isn't the same at least you could see if another "jumps" or reacts like the one in the cluster............
__________________
NW Connecticut
cthusker is offline   Quote Quick Reply
Old 07-15-2013, 12:22 PM   #52
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
HOLY COW!!!! A new gauge cluster is $1225!

Now that I had that shock... what are my options?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 01:37 PM   #53
Supporting Member

WF Supporting Member
 
Verf's Avatar
 
Join Date: May 2013
Location: Western Massachusetts
Posts: 381
Check wiring from sending unit to gauge?
Verf is offline   Quote Quick Reply
Old 07-15-2013, 01:42 PM   #54
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
I don't think that's it, just for the fact it will cool down on the gauge also. I could see if it's pegged all the time.

Can I use an aftermarket gauge? Does the computer need the temp from the sending unit?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 02:01 PM   #55
Jeeper
 
jherrington's Avatar
 
Join Date: Jan 2012
Location: Baton Rouge
Posts: 1,838
Quote:
Originally Posted by WingingIt74 View Post
I don't think that's it, just for the fact it will cool down on the gauge also. I could see if it's pegged all the time.

Can I use an aftermarket gauge? Does the computer need the temp from the sending unit?
The gauges aren't your problem. And you don't buy bran new gauges. Duah. You pull one from a junk yard with similar miles.

But still, gauges aren't your problem.
__________________
98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
jherrington is offline   Quote Quick Reply
Old 07-15-2013, 02:04 PM   #56
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
Quote:
Originally Posted by jherrington View Post
But still, gauges aren't your problem.
Ok.... so what is my problem?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-15-2013, 02:11 PM   #57
Jeeper
 
jherrington's Avatar
 
Join Date: Jan 2012
Location: Baton Rouge
Posts: 1,838
My dads 00 shot up from 200 to redline(240?) then to 260 maybe three seconds later. A few times while driving. Them finally one day the top of the radiator busted open.



Click image for larger version

Name:	image-4150953281.jpg
Views:	52
Size:	173.5 KB
ID:	273123



I highly doubt it's the gauges if mine moved up just like yours do.
__________________
98 TJ sport 4.0L I6 356,000 miles.
No Engine, axle, tranny, or t-case rebuilds.
Check out my 5.3 swap in progress here!
jherrington is offline   Quote Quick Reply
Old 07-15-2013, 05:19 PM   #58
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
My original radiator split kind of like that, which was why I went with the Mishimoto.
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-16-2013, 02:47 PM   #59
Jeeper
 
WingingIt74's Avatar
 
Join Date: Mar 2012
Posts: 321
Anyone have any thoughts on what to check or what could be causing my problems?
__________________
-Travis
2001 Jeep TJ 4.0L/5spd
WingingIt74 is offline   Quote Quick Reply
Old 07-16-2013, 09:12 PM   #60
Newb
 
Join Date: Jul 2013
Location: Taiwan
Posts: 13
You've changed the temperature sensor and assume the sensor is OK.
Try to get some kind of Diagnostic/Scanner tool with ODB2 connector.
This tool are NOT expensive and, it can monitoring vital infos of the your jeep.
e.g. RPM, MPH, Oil presure, Coolant temp......

You can connect the ODB2 scanner to your jeep,
If the temperature reading from the scanner is different from the temp gauge,
maybe the temp gauge is the problem.

The ODB2 Diagnostic/Scanner tool is a very useful tool to monitor/check status of your vehicle. if the temperature reading from the scanner is abnormal, you still have find out the root cause of cooling system.

__________________

WHAT'S YOUR BREAKOVER ANGLE?
It's a Jeep thing. You wouldn't understand.
Kevin-jeep is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 04:04 AM.



Jeep«, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC