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Old 03-08-2011, 12:31 PM
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She's hot when she drives

93 wrangler 4.0

She can sit in the driveway all day long running and not go past 210 degrees. As soon as i start to drive i can watch the Temp gauge go up to 240-250 degress.

I have just recently changed the thermastat to a 190,12lb rad cap, Flushed the system, replaced 5 freeze plugs, added new coolant and "burped" it.

There is no leak from the spill hole on the water pump, fan clutch seems fine, what now where should i start.

Thank you

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Old 03-08-2011, 12:42 PM   #2
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Check your oil to make sure coolant is not in there. Also was there a reason for the maintenance or was it just routine?

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Old 03-08-2011, 12:43 PM   #3
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Also, did it start it right after you did all that or was it a little while later?
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Old 03-08-2011, 12:51 PM
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Yes, I replaced the exaused manifold so i changed all the freeze plugs while i was there, and yes it started rite after i did all the stuff to it.
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Old 03-08-2011, 12:52 PM
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Quote:
Originally Posted by joshd4 View Post
Check your oil to make sure coolant is not in there. Also was there a reason for the maintenance or was it just routine?
The oil is just oil no water
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Old 03-08-2011, 12:52 PM   #6
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Those gauges aren't exactly right on the money, they are more of an "about there" read I would check connections if not replace the gauge and/or sensor...
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Old 03-08-2011, 01:31 PM   #7
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yeah there was someone recently who was getting a False overheat from their gauge.
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Old 03-08-2011, 01:55 PM
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I just read on here that a different thermastat than oe could cause your thermastat temp sensor to read a false reading and cause it to run hotter because it is pushing to much fuel in to adjust.
Anyone know about this.
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Old 03-08-2011, 02:19 PM   #9
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I don't know if it would read false, what I would think would happen is the engine would try to compensate to get it up to temp.

Is the radiator cap higher, lower or the same pressure as the original? if it is lower your temp could be going up because of the increase pressure in the radiator is popping the spring. If that happens, as soon as the pressure is relieved the temperature will increase, almost instantly.

A silly thing to check is to make sure the cap is installed completely, turned past the first stop and all the way to the second stop.
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Old 03-08-2011, 07:36 PM   #10
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check radiator fins for blockage
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Old 03-08-2011, 08:58 PM   #11
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pull the temp sensor and replace it.
a lot of flushing chemicals can and will eat them away and or put a film on them that will in turn send a bad signal.
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Old 03-08-2011, 09:08 PM   #12
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You make have a plugged up radiator on the inside. I would replace it. If it has a vis fan clutch I would replace it also. You have done about everything else!
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Old 03-09-2011, 12:06 AM   #13
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Sounds like a problem i had. Are you running an surpentine belt?
Does it cool down soon as you come to a stop or does it stay hot?
Couple of things to check? Check tension on your fan belt especaly if its a serpenteen and you may have got coolant on it. You can over tighten it for a short time for a test to see if its slipping. The water pump pully can slip when you think it shouldnt be and a lot of times they do not squeel. Make sure there is no oil leaking from fan clutch spring.
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Old 03-09-2011, 03:35 AM   #14
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It's the radiator, I had an old dodge van that would get hot if I went over 45 mph,put in new radiator, problem solved.
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Old 03-09-2011, 02:24 PM
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Sounds like a problem i had. Are you running an surpentine belt?
Does it cool down soon as you come to a stop or does it stay hot?
Couple of things to check? Check tension on your fan belt especaly if its a serpenteen and you may have got coolant on it. You can over tighten it for a short time for a test to see if its slipping. The water pump pully can slip when you think it shouldnt be and a lot of times they do not squeel. Make sure there is no oil leaking from fan clutch spring.
Yes it is a serpentine belt, it cools when i come to a stop well to about 210, I will check on the tention, there is no oil around the fan clutch.
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Old 03-09-2011, 02:25 PM
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It's the radiator, I had an old dodge van that would get hot if I went over 45 mph,put in new radiator, problem solved.
Radiator is only 1 year old unless its plugged
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Old 03-09-2011, 03:35 PM   #17
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Was the engine burped good?
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Old 03-09-2011, 03:43 PM   #18
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You do have the serpentine routed correctly right?
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Old 03-10-2011, 10:47 PM
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Yes i burped it, and the serp belt is as shown on the sticker.
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Old 03-13-2011, 04:19 PM   #20
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Can you see the coolant flow with the cap off and engine at op temp.? You might have a collapsing hose at higher revs.. Air cowl is installed I assume.
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Old 03-13-2011, 11:35 PM   #21
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Do remove the cap while the engine is running, unless you want a face full of pressurized coolant. I have seen these jet up to 15-20 feet above the vehicle. I am going to assume Garyk means to leave it off from when you start it and then watch it. I certainly wouldn't do it if the gauge is reading 240 even if you think it really can't be that high.
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Old 03-14-2011, 12:06 AM   #22
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Clutch fan maybe, I always replace my t-stat w/ a fail safe.
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Old 03-14-2011, 12:31 PM   #23
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Do remove the cap while the engine is running, unless you want a face full of pressurized coolant. I have seen these jet up to 15-20 feet above the vehicle. I am going to assume Garyk means to leave it off from when you start it and then watch it. I certainly wouldn't do it if the gauge is reading 240 even if you think it really can't be that high.
Yes that's what I mean.....I just assume that folks here know better

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