Is this overheating?

[will7798]

Its slightly over 210 and never really goes past the point its at. Is that considered overheating? And if it is, is it enough to worry about or is it not that bad?

P.S. Ive already replaced the thermostat and flushed the system refilled and bled it completely.

[Troubador530]

That's normal for my 87. It gets about like this sitting at stoplights in the heat. As soon as i get moving it drops to normal. Never had a problem

[schardein]

I remember my 89 XJ Wagoneer running about there.  My 91 XJ and 91 MJ cycle between the first mark and the 210 mark.  I had a problem with overheating on my XJ on the Interstate in the summer on long inclines.  Seemed like once it started rising, there wasn't any stopping it, it would continue towards the hot mark unless I stopped to let it cool down.

 

I looked at everything and finally replaced the fan clutch for the belt driven fan which solved the problem.

[will7798]

Would a water pump help anything? My fan clutch is perfectly fine and thats about the only thing left.

[TheDude]

Make sure your efan is actually working.

 

 

1989 Jeep Comanche 4.0L 5 Speed 4x4 Long Bed

1991 Jeep Comanche 2.5L 5 speed Red Short Bed

[reubj]

Mine runs 210° all day long.

[MancheKid86]

Mine runs 210° all day long.

 

how does this help the O/P?

 

 

i wouldn't consider this over heating, it is close though.

 

do you have an electric fan?

 

what temp of thermostat did you throw in?.

 

how is the condition of your temp sensor? it could be giving a false reading

 

have you pressure washed your radiator? 

[HOrnbrod]

That's not overheating at all, as long as it doesn't go any higher. That's about where I sit when in stop and go traffic in the summer. While cruising it stays straight up right at 210*. Pick up an infrared handheld thermometer and verify the actual temperature at the coolant sensor; it will probably read 20* cooler. Mine does. The MJ dash gauges are not very accurate.

[gogmorgo]

Mine wanders up and down with that being about the highest it goes, and the low end of the wander just a hair below straight up. The wandering is unrelated to the thermostat opening, aux fan kicking on, a/c coming on, exterior temp, vehicle speed, or engine speed.

For unrelated reasons, I've changed every single part of the cooling system (even the engine), some parts more than once (eg using the "new" engine's water pump cause I'm lazy instead if the nearly-new one off the old engine) except for the heater core, and the gauge, sender, and their wiring. It still does it.

I've read it can be an early symptom of a failing sender, but it's become no worse in 4 years and 25,000 miles, and it's not bothering me, so I haven't bothered to swap it out.

[jpdriver1]

wish mine would get that warm the three row radiator keeps her about half way between the second and third lines.

[gogmorgo]

What thermostat are you running? If it's the stock one, sounds like it's stuck open if it's not warming up all the way.

[mikekaz1]

factory e fan is set to activate at 216* I believe. which is right about where you are. 190*-220* is completely normal for these trucks

[will7798]

 

Mine runs 210° all day long.

how does this help the O/P?

 

 

i wouldn't consider this over heating, it is close though.

 

do you have an electric fan?

 

what temp of thermostat did you throw in?.

 

how is the condition of your temp sensor? it could be giving a false reading

 

have you pressure washed your radiator?

I have my e fan hardwired right now so its always running (long story about compressor issues) and the thermostat is a 190 with a new temp sensor to go with the XJ dash

[will7798]

That's not overheating at all, as long as it doesn't go any higher. That's about where I sit when in stop and go traffic in the summer. While cruising it stays straight up right at 210*. Pick up an infrared handheld thermometer and verify the actual temperature at the coolant sensor; it will probably read 20* cooler. Mine does. The MJ dash gauges are not very accurate.

All ive had it in recently is stop and go around town so ill take it out soon and see if it drops on the highway

[jpdriver1]

What thermostat are you running? If it's the stock one, sounds like it's stuck open if it's not warming up all the way.

I think it is, not too worried though, was able to run out to and around King of the Hammers without the efan comming on. 

[gogmorgo]

Tstats don't keep the engine cool, they keep it warm, by closing and blocking the coolant flow. If it's stuck shut it'll cause problems, but in a warm climate you may not notice it sticking open as bad as I would, cause here in the winter, a stuck open tstat means no heat in the coolant so your heater will never blow hot.

[will7798]

 

What thermostat are you running? If it's the stock one, sounds like it's stuck open if it's not warming up all the way.

I think it is, not too worried though, was able to run out to and around King of the Hammers without the efan comming on.

I replaced it with a 190* (thats what was recommended but if i should get something different let me know) almost as soon as i got the truck cause it was stuck closed

[MancheKid86]

i think, what me and hornbrod suggested is your gauge is giving a false indication of temp.

 

verify the temp like hornbrod said with an infrared thermometer.

 

 

 

your question about the water pump.

yes, it will help, if its not keeping up with the amount of coolant required to be circulating through the system. good way to function check is keep your revs around 3500 rpm and see if the temps drop down.

if they do then your pump is on its way out.

 

when i did my cooling system i upgraded everything except the rad (i went oem, due to the debunking of a 3 core. it cools the same amount as oem, has the exact same surface area of coolant flow. some memembers even stated that it doesnt cool as efficient as oem, so its requied 3 high flow aux fans to fix that issue)

but what i did do was

 

new rad open cooling system conversion

flow kooler water pump

ported and polished thermostat housing

and a performance high flow thermostat @ oem spec temp rating

wired my aux fan to a switch on the dash.

 

i now have issues keeping it at opperating temps. this was with a 4.5L stroker, on 40's in 104 F and up heat in the desert (it does get nice and hot climbing big hills, middle of summer, low speeds. but with the aux fan on it drops immediately)