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Old 05-18-2012, 11:51 AM   #1
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jeep runnin hot??

Hey guys what temps are you runnin with the AC on in the mid to upper 80s??? For the first time today my temp went over 210 and kinda scared me. Should i be worried???

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Old 05-18-2012, 12:05 PM   #2
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My needle just touches the zero in the 210 label with the AC on and going about 70mph.

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Old 05-18-2012, 12:07 PM   #3
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Yea a quick update, i went to drive it ( i was idle for like 30min) and when i drove it i had no power and felt like it was gonna stall. Then it kicked and got all the power back and the temp dropped to below 210. Any one know what causes this?
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Old 05-18-2012, 12:16 PM   #4
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On my I6 I used to run between 205 and 210 all the time. Surprisingly, after replacing my water pump I cannot get it over 185, even on the expressway. I drove 9 hours straight through and never went over 185. I didn't realize an old water pump could really be that crappy...

That being said, Im not saying you should replace your water pump. But, if nothing else works, you might want to.

do you have fresh coolent and enough of it?
make sure your not low on oil.
fans working ok?
brakes arn't dragging?

low oil, low coolent, loss of power to fans and dragging brakes are a few top reasons to run hotter than normal.
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Old 05-18-2012, 12:33 PM   #5
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Hey guys what temps are you runnin with the AC on in the mid to upper 80s??? For the first time today my temp went over 210 and kinda scared me. Should i be worried???
nope.

mine points around 210 all day...even when the actual temp is anywhere between 190-230°F. you need an OBDII scanner to actually give you an accurate temperature reading. the resolution on the stock gauge blows, IMHO.
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Old 05-18-2012, 12:33 PM   #6
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Originally Posted by sevenservices
On my I6 I used to run between 205 and 210 all the time. Surprisingly, after replacing my water pump I cannot get it over 185, even on the expressway. I drove 9 hours straight through and never went over 185. I didn't realize an old water pump could really be that crappy...
Hmmmmm makes me wonder. My 2000 4.0 runs at 210-215 and warms up fast...
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Old 05-18-2012, 02:09 PM   #7
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On my I6 I used to run between 205 and 210 all the time. Surprisingly, after replacing my water pump I cannot get it over 185, even on the expressway. I drove 9 hours straight through and never went over 185. I didn't realize an old water pump could really be that crappy...
Hmmm, guys, there is a thermostat that controls coolant temp. I'm not sure, but I suspect the stock thermostat is a 210 degree thermostat. However, there is little guarantee that you have a stock thermostat if you bought a used Jeep. Or, for that matter if it even has a thermostat.

If it warms up fast and levels out at about 210, I would say that's normal. If it warms up fast and stops at 185, I'd say you have a 185 degree thermostat. If it warms up slowly, the thermostat may be stuck open or you may not have a thermostat at all.

If it normally warms up to 210 but then goes some higher with A/C, I'd have the system flushed before I'd worry about a water pump. Also, make sure your radiator is clean on the outside and all cowling in place.

Overheating at lower speeds might mean a bad fan clutch, but at highway speeds, this should not affect temps. Personally, I would not suspect a water pump unless it was leaking.
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Old 05-18-2012, 02:29 PM   #8
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Hey guys I've been having trouble with this as well. I got a new thermostat, water pump, and flushed the radiator and it's still running at about 215-220. Then every once in a while it will go up to 260 and the "check gauges" light will go off. When this happens I just give it some gas and run up the rpms a little bit an it'll go back down. Any ideas on what this could be? Thanks
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Old 05-18-2012, 03:02 PM   #9
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Hey guys I've been having trouble with this as well. I got a new thermostat, water pump, and flushed the radiator and it's still running at about 215-220. Then every once in a while it will go up to 260 and the "check gauges" light will go off. When this happens I just give it some gas and run up the rpms a little bit an it'll go back down. Any ideas on what this could be? Thanks
Did you replace the fan clutch when you replaced the water pump?
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Old 05-18-2012, 03:08 PM   #10
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Hey guys I've been having trouble with this as well. I got a new thermostat, water pump, and flushed the radiator and it's still running at about 215-220. Then every once in a while it will go up to 260 and the "check gauges" light will go off. When this happens I just give it some gas and run up the rpms a little bit an it'll go back down. Any ideas on what this could be? Thanks
did you "burp" the system? did you drill a bleed hole in the thermostat casing to vent out the air?
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Old 05-18-2012, 03:10 PM   #11
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Hmmm, guys, there is a thermostat that controls coolant temp. I'm not sure, but I suspect the stock thermostat is a 210 degree thermostat. However, there is little guarantee that you have a stock thermostat if you bought a used Jeep. Or, for that matter if it even has a thermostat.

If it warms up fast and levels out at about 210, I would say that's normal. If it warms up fast and stops at 185, I'd say you have a 185 degree thermostat. If it warms up slowly, the thermostat may be stuck open or you may not have a thermostat at all.

If it normally warms up to 210 but then goes some higher with A/C, I'd have the system flushed before I'd worry about a water pump. Also, make sure your radiator is clean on the outside and all cowling in place.

Overheating at lower speeds might mean a bad fan clutch, but at highway speeds, this should not affect temps. Personally, I would not suspect a water pump unless it was leaking.
yes. makes sence on the temp. of the thermostat. That it itself may be why Im running cooler now. My water pump was squeeling like a pig. Then it started to drip out the shaft.
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Old 05-18-2012, 03:13 PM   #12
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did you "burp" the system? did you drill a bleed hole in the thermostat casing to vent out the air?
that was my first thought to. either an air pocket in there or a blockage in the radiator blowing clear with higher pressure. my wifes 2k durago with the 5.9 magnum had that issue until we burped the air out of the system.
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Old 05-19-2012, 09:17 AM   #13
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Did you replace the fan clutch when you replaced the water pump?
I did not do this... I have an aftermarket electric fan though and it's definitely working. Runs for probably 15 minutes after I park it. Is that normal? It has a thermostat with a knob on it but I just figure keep running it and cooling down everything.
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Old 05-19-2012, 09:39 AM   #14
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My 2000 was running just a little warm in summer till I replaced the radiator with aluminum one. It runs about 200 ( normal) I don't like electric fans cause if they go out than that's it.

As far a your fan running after the engine is turned off, well it does very little cause there is no circulation of coolant.
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Old 05-19-2012, 10:47 AM   #15
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^^^ You had an aluminum one before too. My 97 that has a real temp gauge runs about 200* day and night AC on or off in temps up to 110*. I run about 210* on one long grade I have to pull 3000 rpm for about 5 minutes to keep my speed up, after I crest the hill, right down to 200* again. Bone stock cooling system and a quart of Water wetter.
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Old 05-19-2012, 11:01 AM   #16
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The factory specified/recommended thermostat temperature is 195 degrees. You won't find a 210 degree thermostat in an auto parts store.
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Old 05-19-2012, 02:08 PM   #17
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The factory specified/recommended thermostat temperature is 195 degrees. You won't find a 210 degree thermostat in an auto parts store.
I don't dispute that. The difference may be simply in the sensor and guage calibration, but a lot of Jeeps, including mine, run almost dead on 210 degrees.
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Old 05-19-2012, 02:11 PM   #18
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Make no mistake, the engine is actually running at the indicated 210 or so degrees. I'm just saying the correct thermostat is a 195 degree model.
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Old 05-19-2012, 02:51 PM   #19
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Hmmmmm makes me wonder. My 2000 4.0 runs at 210-215 and warms up fast...

Mine too!
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Old 05-20-2012, 12:23 AM   #20
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mine has run right at 210 until today. the outside temp got 85 and my gauge went up and redlined then quickly came back to 210. Then it went back to redline and backed off some. I cut the heat on and it came back to 210 so i headed home. I wonder if the thermostat is getting stuck or the waterpump/fan clutch is going bad.
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Old 05-20-2012, 01:54 AM   #21
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mine has run right at 210 until today. the outside temp got 85 and my gauge went up and redlined then quickly came back to 210. Then it went back to redline and backed off some. I cut the heat on and it came back to 210 so i headed home. I wonder if the thermostat is getting stuck or the waterpump/fan clutch is going bad.
Something in your cooling system is amiss, I would check thermostat because it is cheapest to replace. Water pump is usually only bad when it's leaking.
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Old 05-20-2012, 08:01 AM   #22
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Those are good temps Devil. I had a copper radiator before, the aluminum is more efficient with heat.
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Old 05-20-2012, 08:51 AM   #23
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^^ You replaced an aftermarket with another aftermarket, just aluminum this time. I thought it sounded like you replaced an oem with another.
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Old 05-20-2012, 09:47 AM   #24
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mine has run right at 210 until today. the outside temp got 85 and my gauge went up and redlined then quickly came back to 210. Then it went back to redline and backed off some. I cut the heat on and it came back to 210 so i headed home. I wonder if the thermostat is getting stuck or the waterpump/fan clutch is going bad.
That sounds exactly like your thermostat is sticking shut. Replace it with a good 195 thermostat like from Robertshaw. Use a paper (fiber) gasket and don't use any additional sealant like RTV, just make sure both gasket seating surfaces are perfectly clean and note which way the old thermostat was pointing so you can get the new one facing the same direction.
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Old 05-20-2012, 01:07 PM   #25
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Sorry for butting in on another persons question but this was related and may help.
Thanks for the answers Eagle223 and Jerry. I'll get a Thermostat and give her a try.
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Old 05-20-2012, 02:13 PM   #26
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Hmmmmm makes me wonder. My 2000 4.0 runs at 210-215 and warms up fast...
my 03 does too

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