210 give or take a little is norm

 

It should be right at 210°

That said, I just replaced my waterpump last week because it had a noisy bearing and while I was in there I went ahead and replaced the thermostat. Evidently, the guy at the parts counter gave me the wrong thermostat because now it won't get above 195° and that's at high RPM's on the interstate and at idle. I haven't noticed a difference other than the gauge on the dash though :dunno:

 

Same thing happened to my brother. It was probably a good thing because his Jeep would climb to over 220 sometimes when idling. Whats weird is, He got is first 330 mile tank after doing this. Thermodynamically it makes no sense, but it happened.

 

i wouldnt go off of the gauge on the dash for a correct temp reading, get a gauge or digital display. ive run up around 235 (bad water pump) a few times and the dash gauge stayed at 210.

 

My numbers came from the Torque app on my phone, so they're direct from the computer.

 

^^That's a cool setup. Does that come with the banks kit?

 

it doesnt but you can order PN 61195 if you want to add it to any 03-06 jeep or pn 61201 for 07 and up.

 

My TJ runs at 210 on the money as well. It might get a touch above that in the dead of summer while over working the motor but thats an extreme situation:thumbsup:

 

I've driven fairly often with a scan tool plugged it in. I don't recall ever seeing my temp climb above 211-212 and never below the high 190's.

The dash gauge barely moves except during warm up.

 

Mine runs +/- 1 needle width of 210 depending, except for a time period in which I drove with a radiator that was falling apart.

 

My gauge typically shows about 210, with a corresponding reading of 203 on my Ultragauge.

 

My 97 reads about 190/200 pretty much all the time, the needle has gotten up to 210 briefly a few times

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I run about 204-206 according to the torque app and Bluetooth reader

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i wouldnt go off of the gauge on the dash for a correct temp reading, get a gauge or digital display. ive run up around 235 (bad water pump) a few times and the dash gauge stayed at 210.

I can't believe your IAT is over 200° I get concerned when its much lower. Mine doesn't usually get much higher than this but I think I've seen 190° and was alarmed. I realize the exhaust being under the intake accounts for this but almost every vehicle I have owned the temps stay near ambient engine bay temps. My Toyota actually runs cooler than the engine bay temps with the factory intake.

 

I got a new-to-me 2000 Wrangler sport, 4.0L, 3 speed auto. I was curious as to what temperature is normal for highway speeds and when crawling in the woods. The thermostat is 190. It seems anything above that would indicate an inadequacy, either in the pump or the radiator or a head problem. What temp is considered "normal" for these jeep 4.0 tj's to run at freeway speeds and while idling for a prolonged period. Thanks.

Normal is 210+/- a few degrees and the OEM recommended thermostat is 195 degrees...

 

My '04 Rubi with 47K miles runs a tick over the 210 hash mark at any speed, from idling in town traffic to 10 mins at 80 mph on the freeway.

 

Via ScanGauge 210 during normal conditions. Runs up to 220 on the highway with ambient temps above 95 degrees with A/C on. Idling during hot weather with A/C on, engine temps will stay a little over 210, and IAT temps get up to 210! Those dang mini cats.

 

The oem gauge is not reliable and will jot register hot until its too late to do anything but cry as your 4.0 dies a hot bubbly death.

That said I recommend an actual water/coolant temp gauge. Mine is mounted on the A pillar along with my vacuum gauge.

 

The oem gauge is not reliable and will jot register hot until its too late to do anything but cry as your 4.0 dies a hot bubbly death.

That said I recommend an actual water/coolant temp gauge. Mine is mounted on the A pillar along with my vacuum gauge.

This^^^

Except for us early TJ guys who have real time (& fairly accurate) gauges. I can see my needle move sometimes right after blipping the throttle after sitting a min...Early TJs don't just have dummy lights

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According to my Scangauge my typical temps are 205-214 °F. Most I've seen it vary in normal driving is 201-220 °F.

 

My '03 runs a needle width over 210 and in the San Antonio Summer it is always 210+.
If a 195 thermostat replacement drops it down, is that a good thing? Doesn't it need a certain amount of heat?

 

OEM recommended thermostat is 195 degrees which will allow your Jeep to heat up to 210. If you run a lower temp thermostat, your Jeep won't get up to 210 and will be in "warm up" mode. You'll lose efficiency/mpg doing this.

 

hi all

stock is 195 and will run to 210 temp normally.


BUT I have always run hi flow 180 temp thermostat, and it runs 171 -186 normally (data logged temps), mine shows closed loop at 170 temp,
passed 2 state inspection in last 6 years, never overheated. Avg mileage is 12.6 mpg, last 12 months (data logged ), ....................................................................

 

hi all

stock is 195 and will run to 210 temp normally.

BUT I have always run hi flow 180 temp thermostat, and it runs 171 -186 normally (data logged temps), mine shows closed loop at 170 temp,
passed 2 state inspection in last 6 years, never overheated. Avg mileage is 12.6 mpg, last 12 months (data logged ), ....................................................................

Why do you think it is better to run cooler like that? With your setup I would have thought you'd do way better than 12.6 MPG. I know I do with a more aggressive setup.

 

My stock cooling system would ocasionally hit 250F according to my after market guage. Like the time it was 120+ in Death Valley and I was running 70 with the AC on with the fan clutch bolted solid.

I tried different things to cool it down. The most notable difference was hogging out the thermostat housing.

Now with my 195 stat, hogged out housing, 2r aluminum Radiator and 10 blade Explorer fan and clutch I rarely see 215. Usually runs 200-205. Dont forget that the newer guages are just a dummy guage. It may show say 210 but it may me 230ish. Once it hits 235ish the computer moves the needle 1 needle width to the right.

Nothing wrong with 230ish, 250 had me worried though.

 

My dash gauge always seems to be a bit below 210. When I use torque pro, I watch the temperature fluctuate between 192 and 197. The thermostat is 195 degree, new Mopar water pump, new Mopar radiator, and a new hd Clearwater head. I'm not sure what causes this TJ to run lower temperature, my last TJ was always right around 210. These readings were taken after I drove home from work, about 10 miles highway and 1 on city streets. It was about 85 out and I was sitting in my drive way right after getting home. I thought my fan clutch was stuck but it is working fine. I can't see the numbers when I'm driving but since the dash gauge pretty accurately reflects what I see in torque I don't think it would change much. Ac also doesn't seem to effect the temperature at all.

 

Regardless of what anyone say, I'll trust a mechanical gauge with a dedicated sender over any gauge related to the engines computer.

 

Is there a separate sending unit for the ECM? If I use a scanner plugged into the diagnostic port to get a coolant temp reading, is it coming from the same sensor the gauge reads from on the thermostat housing?

It seems to me that if the thermostat opens at 190, the only way for the coolant temp to run at 210 is from either a substandard radiator (not cooling down enough) or not enough flow (water pump fins corroded or thermostat or housing physically too small).

I drove it one more time before tearing into it. Around town on surface streets 210. One highway about 65mph about 220-230 (according to stock gauge). Sitting at idle for 20 minutes 220-230.

I looked up the scangauge that a couple posted mentioned and that seems pretty sweet. But do most inexpensive scan tools also show all the sensor values (coolant, intake air temp, o2 readings, etc)? If someone has one that they like, chime in, as I think that is going to be one of my next purchases. Thanks.

Fugitive

 

It seems to me that if the thermostat opens at 190, the only way for the coolant temp to run at 210 is from either a substandard radiator (not cooling down enough) or not enough flow (water pump fins corroded or thermostat or housing physically too small).

Thermostats give you a minimum operating temperature not a maximum. The maximum is based on the rest of the factory design and there is no reason that design can't be at a higher temp than the thermostat temp. In a TJ that target operating temp is 210 area.

 

You have to remember the boiling point for water, or engine moisture is 212F.

If you aren't getting up to at least 210F you aren't ridding your engine of moisture which will lead to corrosion.

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The boiling point of your coolant is much higher than 212 in a properly working system. It should be around 260 depending on the anti freeze mixture used.

 

I have a 2004 LJ with 140,000 miles. I started getting the odor of radiator fluid and some overheating readings of above 220. Could not stop boil overs either. So I first made a jumper to isolate the heater core with no positive results. Still boiled over and had coolant smell. Long story short I replaced Radiator with aluminum after market, high volume water pump, royal purple treatment and proper coolant with distilled water and new thermostat, after water pump break in I have no more coolant smells. I will replace the heater core in the spring of if we get a few warm days this fall. Got the parts just dont have the time to have Jeep down for a couple days. Will probably keep and modify the heater core bypass and use it in the summer. So.... after all the work I run around 200 with no more boil over problems.