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Old 06-11-2013, 01:20 AM   #1
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Overheating

My 98 Sahara has been overheating a lot lately. I have already flushed and filled the coolant system and radiator. My next move is to replace the thermostat. This is where I have a problem.

Which thermostat do I buy? 165, 180 or 195 degree?

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Old 06-11-2013, 01:34 AM   #2
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When it over heats does the cooling fan run. Mine is intermittent. There is usually a CEL. I forget the code but there is an open high speed cooling fan circuit detected. My fix was done with superchips traildash which is a bandaid fix vs. finding the problem. But that is likely the situation.mturnit off for a while and it later runs perfectly.

Do a search you will find lots of info on it.

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Old 06-11-2013, 07:02 AM   #3
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You want to make sure to "burp" the system to get any air bubbles out of the system after you flush/fill the cooling system.
You would want to stay with the factory 195 degrees T-stat. Our Jeeps are made to run at 210 degrees temp. What is the temp and when do you noticed it overheating?
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Old 06-11-2013, 07:51 AM   #4
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This is the normal temp reading before it overheats. If I turn the heater on it usually cools back down to this temperature. It randomly rises after its been at driving temp for about 20 minutes.
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Old 06-11-2013, 07:52 AM   #5
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Quote:
Originally Posted by Wattapunk View Post
You want to make sure to "burp" the system to get any air bubbles out of the system after you flush/fill the cooling system.
You would want to stay with the factory 195 degrees T-stat. Our Jeeps are made to run at 210 degrees temp. What is the temp and when do you noticed it overheating?
What do you mean "burp" the system?
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Old 06-11-2013, 08:05 AM   #6
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Subbing for this. I have the same problem. Already replaced the thermostat. Mine used to be right at 210 all the time. I overheated and now I'm at the temp your showing. I have to be going 50mph or above to get there. Anything below 50, I stay at 210.
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Old 06-11-2013, 08:09 AM   #7
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Originally Posted by Grateful Parrot View Post
Subbing for this. I have the same problem. Already replaced the thermostat. Mine used to be right at 210 all the time. I overheated and now I'm at the temp your showing. I have to be going 50mph or above to get there. Anything below 50, I stay at 210.
I would say that's about right. But it has done it while under 50 but it takes longer to do it. Once it goes up and I've turned the heater one it goes back up regardless of speed once I've turned the heater off.
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Old 06-11-2013, 09:07 AM   #8
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I'm linking my thread to you so you know what's going on with mine. Might be useful information to help you with yours.

http://www.wranglerforum.com/f5/need...ry-247783.html
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Old 06-11-2013, 10:01 AM   #9
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Quote:
Originally Posted by MySahara View Post
What do you mean "burp" the system?



I believe that buying T-stat with the vent hole will do the same thing but I would do both.
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Old 06-18-2013, 12:46 AM   #10
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Let me start with this. I am not mechanically inclinded at all. I know the water pump has a weep hole. Could someone post a photo of where the weep hole is so I know what I am looking for. Before I change the TStat I want to make sure it's not the WPump.
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Old 06-18-2013, 01:03 AM   #11
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Often overlooked is radiator caps. They keep the cooling system under pressure. This pressure is important to the overall cooling capability of the system. For every added PSI of pressure the boiling point of the coolant/water mix increases about 2.5 degrees F. If you have an 15 PSI rad cap (hypothetical number - I'm traveling on business so I can't run out and check mine but they usually say somewhere on the cap) you will add 37.5 F to your boiling point. 212+37.5= 249.5

If your rad cap is bad, your system will over heat faster than the same system with a fully functioning cap because your system will boil over at around 212F.

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