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Unread 08-28-2001, 11:09 PM   #1
Turtle
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Over-heating on the highway....

Hi! I have a 88yj 6cyl,absolutly love it though this is quite a disappointing matter to me . I have been experiencing overheating on the highway and am unable to get out of town! I have had everything done from replacing the thermostat to replacing the head gasket. I am perplexed as everyone in town that has worked on my jeep! Is there something here I am missing? I would appreciate all the ideas anyone has to offer.
Thanks so much in advance!!!
EB

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Unread 08-28-2001, 11:23 PM   #2
RickCJ7
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How do you know it's overheating? Stock gauge, differant gauge, water blowing out? What is the temp?? Do you have a big winch or anything on the front blocking the air flow? Give me some more details so I can help.
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Unread 08-29-2001, 11:01 AM   #3
Turtle
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Well, I know it is over-heating due to my guage going in the red,( not like that always is truth)so, I pull over, fluid is coming out of my resovoir, or rad.cap. I have also had the tempertures tested against one another(guage and actual temp. inside rad.) My whole unit(hoses,cap,rad.) can be extremely hot within a 1/2 mile to the touch.
The person who works on my car said it is probably 10 degrees of at most. Which I am told this is pretty close to being acurate?The problem here is that this only happens when I have been drivng on the highway.(sadly for only 10 miles at most) I have had the thermostat, thermostat housing,rad. flushed and checked, hoses replaced, waterpump and fan replaced twice! my last hope was the head gasket being replaced!Sadly, That did not work either! Oh, I also put in a new sender yesterday,(suggestion from forum) although to trace the wires to the guage I am not sure of?- waiting for some help. Someone had told me to check the timing? hopefully, that will be checked today! The real big problem here is that no one that works on my car knows where to go from here and frankly,is probably tired of seeing my me and my Jeep! ( that's just my reading)But I am not going to give up on her! I am willing to learn all that I can to fix her myself!!( Shoud be interesting!) I have gotten mannuals, so any suggesions are welcomed with open arms! Thank you! Eb
Oh, I forgot my temperture stays at 200-230, moves quite quickly into the red. Once, it brought itself up a few degrees, nothing to write home about...Appreciate the time and effort involved!
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Unread 09-03-2001, 08:49 AM   #4
ga_mudder
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Quote:
Originally posted by Turtle:
<STRONG>I have had the thermostat, thermostat housing,rad. flushed and checked, hoses replaced, waterpump and fan replaced twice! my last hope was the head gasket being replaced!Sadly, That did not work either! </STRONG>
If you are losing water out of the cap and resevoir, the water has no other place to go. Sounds to me like you have a stopped up heater core. BEFORE REPLACING THE HEAD GASKET, HERE IS AN EASY TEST: 1)When the engine is COLD, crank it. 2)Immediately remove the radiator cap. If water shoots straight up from the radiator when the thermostat opens, the head gasket is shot. If it doesn't, the head gasket is fine.

GOOD LUCK!
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Unread 09-03-2001, 05:44 PM   #5
Pantera
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I had almost the same problem several years ago with a Chevy Caprice... I changed out about everything and nothing helped... As it turned out, my radiator was clogged up... I ended up getting a new rediator and the problem was cured...
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Unread 09-05-2001, 01:54 PM   #6
NaeKid
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I agree with checking the radiator and the heater core .. remove both of them and have a good radiator shop check for leaks and to rod them out.

They might find something wrong, but if not, you know your flow would be fine.

They might also recommend another route to check as they usually are the cooling experts.
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Unread 09-06-2001, 08:31 AM   #7
Turtle
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Thanks Ga-mudder,Pantera and NaeKid for the suggestions, problem is I have had all of that done!! Radiator is in pefect condition from what I am told. I took it in to a cooling specialist, he simply shook his head with dis-belief it was overheating. The entire unit was taken out and tested for a blockage of some sort, nothing found. His suggestion, even though the pressure test came out negative was to replace the head gasket, which I did with hesitation. To my disappointment, this was not the solution either.My heater core was checked last winter, I still have heat, not as much as I would like but who does that owns a Jeep? Everyone as I am, is perplexed with this problem, The people in my area don't know where to go from here. The dealership to my surprise frankly does not want to look at it extensively because I am told they don't have a manual fo my year 88YJ.Is that a crock or what? never heard of such a thing. I told them I could bring in my mannuals if that helped at all. I have had so much help from these forums, how fortunate we are to share ideas with one another.
I have learned so much information from all of you, Thanks again to all of you that have contributed your ideas and time! Eb
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Unread 09-06-2001, 12:15 PM   #8
JeeperJay
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Are you running big tires with the stock gears? If so, maybe the motor is just working too hard to keep everything moving. Just a thought.
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Unread 09-07-2001, 10:20 PM   #9
NaeKid
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I talked to my buddy who owns the best Rad-shop in town (he is also a hardcore wheeler). He told me a couple of things to check .. and if failing that, he said come on up here, and he will fix it for you.

When you changed your head gasket, did you get the head magnafluxed? If not, you might have a cracked head, verify that right away.

What kind of radiator are you using? Stock? If so, find a 3 or 4 core heavy duty rad (or custom build one) and test that.

You changed your fan, but did you change the fan clutch? If the fan clutch has gone bad, it would not be able to pull the air properly.

Have you considered an electric fan?

Again, if you tried all that, let me know the details, and my buddy might be able to come up with another solution, or ask that you bring him your Jeep ..
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Hello, my name is Vance and I am a Jeepaholic.
Its better to be naked with your friends, than to be clothed with your enemies
  • From street to trail, '88 YJ on 38" tires does it all well
  • Silver 2006 TJ Unlimited, zombie ready as the daily-driver
  • a Kawasaki KLR650 DualSport bike

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Unread 09-10-2001, 04:50 PM   #10
Cinderella
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hi folks,

all this discussion and no definite "technical" / "mechanical" failure identifiable does remind me of a similar problem i encountered some years ago: Being a rookie ;-(( , driving through some (read : MOST) of the muddy WET passages on a trail and being HAPPY to arrive at the camp-place with a "cool" looking jeep ( color= mud-brown all-over although normally it schould be yellow with a black top)

BY CLEANING IT UP, I RUINED ONE RADIATOR because of putting high water pressure directly unto it. IT got cleaned allright but the heating-ducts were all bend and proved to be useless afterwards ( no problem with water-flow, no problem with the thermostat , no problem with whatever INSIDE the system, the cooling "little pieces of metal" =OUTSIDE (excuse my english) were simply gone. SO: The system was working but couldn't release the heat. well: once you realize that: swapping in another (not damaged!) radiator body simply put all to normal. Lesson learned: Clean but don't overdue ( overpressure?) it

Just a thought, if your radiator suffered some severe cleaning you can "see it"

just wondering .-)
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Unread 09-18-2001, 11:35 AM   #11
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I just wanted to thank all of you for your input and suggestions. I appreciate all the time and effort involved. The problem has been fixed!!!! I put a larger radiator in my jeep, thanks to Naekid's friends suggesion. Please do thank him for me.This forum as well as others in its genre have helped immensely!!!!
Never give up...Eb
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