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i have a 82 CJ-7 with a 258 in it....everytime i have wheeled it i watched the gauges and they seemed to be fine. The temp gauge prolly only went about 1/4" past the 'C'. The motor never really felt that hot. Maybe cause the only times i had wheeled it before was when it was cold outside. Anyway, about a month ago i went wheeling at the Slabs in the Llano river just outside of Austin, TX. The gauge was reading the same as it always had but the hood was untouchable. I opened it up and the motor was also putting off alot of heat. The radiator was not boiling over to bad when i popped off the cap. I was wondering if anyone has had these same problems with their 258? And if so how did they fix them?

Also i do not have a fan shroud...the jeep didnt have one when i got it. Would a shroud really make that much difference? Is there anyone who has made one because i hear that they are very expensive peices?

any information would be greatly appreciated
 

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Before anyone slams you saying this is a JU question, I'll do it. <IMG SRC="smilies/wink.gif" border="0">

I'll answer your question with questions.

What condition is the motor in?
Mileage?
Timing set properly?
Radiator in good condition?
Try running a cooler thermostat?
Proper mix of water/coolant?

One thing I did was get an actual guage with actual #'s on it, it is far more useful than the stock one.
Mine (stock)BTW would randomly shoot all over the place, nothing to do with actual motor temps.Wiring/guage were fawked.

My 258 runs at around 190 or so on the highway, and a few degrees higher, when wheeling FYI.
The hood gets hot, and the motor gets hot.
No fan shroud here either.
Change your thermostat to a cooler one.
MJ

[ 10-11-2001: Message edited by: Maine Jeepah ]
 

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NO! Do NOT change your thermostat to a cooler one. If it's running hot, putting a cooler thermostat in is going to have no effect. It is the same as putting your air conditioner in your house on 58* instead of 68* when it's only cooling down to 75*. A cooler thermostat can in many cases actually cause more problems than it will solve.

If there is a cooling problem (which it appears there is) you have to fix the problem. I'd start with a good flush and if you only have a 2 core radiator upgrade to a 3 core. This will also resolve any radiator clogging issues you may have.

You might also have a bad fan clutch. If it's never engaging it'll run hot. I will say on a 258 I suggest you stay away from flex fans. One good water crossing will flex the fan right into the radiator. I speak from experience on this one <IMG SRC="smilies/frown.gif" border="0">
 

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What TornadoTJ say says excellent advice.

Fis the problem, DO NOT throw band aids at it.
 

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Also how are the upper, and lower hoses.

They tend to get soft and I think it is the lower one that closes up.

Yeah the fan clutch is another thing I thought of at work today.

If everything is working properly switching to a cooler thermostat just allows it to open earlier, and cool earlier.
And thus run cooler.

If you have a clogged rad./bad fan etc...you will only be pushing hot coolant through the system faster, and this really does nothing.
Sorry should've qualified that.
If you want it to run hotter lets say in winter, you put in a hotter one.
This allows the motor to run warmer.

Granted both ways these ar only small increments....

SO tornado, what problems does running a cooler thermostat cause? Please straighten me out on this.
Thanks.

MJ
 

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First off, your engine is designed to run at a certain temperature. If you alter this temperature, you change the gaps and the tolerances are all off. This would affect any model of Jeep.

On newer computer controlled Jeeps, if you get the temperature too low, I believe the cutoff is around 170, the engine will think it's running cool and run too rich, like having the choke on all the time.

It's best to keep the temperature where the manufacturer intended. That's the great thing about an efficient cooling system, it allows the temperature to stay steady no matter what the ambient temperature. It's the thermostats responsibility to alter the coolant flow to make sure this temperature remains as constant as possible even if the coolant is really cool.
 

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You definitly want to put the shroud on. Your fan can't pull enough air thru the radiator when your idiling and going slowly on the trail. The shroud is designed to increase the effectiveness of the fan. I agree with the other posts. Flush your radiator and block, check your hoses, throw on the shoud and a new stock thermostat and that should take care of it.
 

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First thing is find out what is wrong with the gauge and then try some of the stuff that these guys have said. Another thing to think about is timing, if your timing has come out of adjustment your engine will run hotter. <IMG SRC="smilies/usa.gif" border="0">
 

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I think you need to upgrade the radiator to a 3 core and one that has the correct inlet and outlets for that sb 400 <IMG SRC="smilies/thefinger.gif" border="0">
 

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Another thing you may check is to make sure the radiator itself is clean so that the air can flow thru it. I noticed mine getting a little hotter than normal and found the fins to be clogged with caked on mud and dirt. Washed everything down really good and it's back to normal. Only thinking this because you said you were wheelin at the Llano River.
 

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All the replies so far are really good points. I also had the same prob. w/my '82-7
(304). And since I have an 8274 blocking all my air flow I upgraded to a 4core, but that left no room for a mech. fan OR SHROUD!!
Having said that dual or even a single eletric fan,good temp gage,an entire system flush, and you should run koooler. (even I did)
Also if you go the route of eplacingthe radiator GDI has about 3 that will work in yor jeep, sorry don't have any part numbers>


Till next time-
 
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