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Old 11-30-2010, 10:41 PM   #1
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What temp should I be running at?

I have a 92 4.0L YJ. It runs about 145-150. It seems a little low. What should I be running at?

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Old 11-30-2010, 11:58 PM   #2
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Most YJs run between 190-210. Mine sits at 210 consistently.

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Old 12-01-2010, 06:34 AM   #3
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most yjs run between 190-210. Mine sits at 210 consistently.
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Old 12-01-2010, 10:35 AM   #4
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My Jeep was running at 130 for the last week so I changed the thermostat. My thermostat was actually stuck and as soon as I changed it it began running around 190 - 210. It was 7 bucks and really easy to fix.
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Old 12-01-2010, 01:02 PM   #5
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most yjs run between 190-210. Mine sits at 210 consistently.
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Old 12-01-2010, 07:17 PM   #6
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Do you have to drain the system or can you do it without?

Also, is there a way to tell if the gauge is bad instead of the thermostat?
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Old 12-01-2010, 09:21 PM   #7
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Do you have to drain the system or can you do it without?

Also, is there a way to tell if the gauge is bad instead of the thermostat?
You will only lose, at most, about a half a gallon of antifreeze. So, you don't have to drain the system unless it is really contaminated. If you have never changed a thermostat then just follow the two inch rubber tube on the top of the radiator to where it goes into the engine. There are two bolts to loose and then it is off. You'll see the thermostat as soon as you take off the hose housing. The hardest part for me was the lower bolt. It is right in line with the serpentine belt. I just had to push the belt down with one of my fingers and then loose the belt.

I wouldn't mess with the gauge until you have changed the thermostat first.
It's really a good idea to change the thermostat anyways just so it doesn't go bad when you're 20 miles from home and left stranded or have to change it on the side of the road. Trust me, my fuel pump went out last night on a highway. I thought it was my filter so I was changing that as cars were flying by me. That didn't work and now I have to drop the tank and change the fuel pump. I had to have it towed home.
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Old 12-01-2010, 09:27 PM   #8
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Old 12-01-2010, 09:55 PM   #9
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↑ You have to use the upload option in order to post a picture from your computer, the img button only works for a web address
Thanks, Vaultzz!!! This was my first photo upload onto the forum. Still learning...

So, here is the photo in case you have not changed a thermostat before:

Click image for larger version

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Old 12-01-2010, 11:24 PM   #10
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Thanks! I'll do that this weekend.

Do I need to worry about where the fluid is going to land if I don't drain the system?

Also, is there different temps thermostats?
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Old 12-02-2010, 03:50 AM   #11
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get the 190 its the right one
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Old 12-02-2010, 07:11 AM   #12
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Thanks! I'll do that this weekend.

Do I need to worry about where the fluid is going to land if I don't drain the system?

Also, is there different temps thermostats?
I replaced mine in my driveway. I just let the antifreeze leak out onto the ground and once I was done with the Jeep I just took a hose and a broom and just scrubbed it out of the driveway so it wouldn't stain. In the summer it would probably kill your grass.

As long as you have a stock jeep motor then all of the thermostats should be the same, as long as you tell the guys at the auto parts store which Jeep model and engine you have.
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Old 12-03-2010, 09:07 AM   #13
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Please do not let your antifreeze leak onto your driveway and then rinse it off. That stuff is extremely toxic. Just catch it into a bucket and either put it back into the jeep or take it up to your local advanced auto parts to dispose of. I'm not tree hugger, but you have to be a little more responsible than that.
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Old 12-03-2010, 12:56 PM   #14
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Please do not let your antifreeze leak onto your driveway and then rinse it off. That stuff is extremely toxic. Just catch it into a bucket and either put it back into the jeep or take it up to your local advanced auto parts to dispose of. I'm not tree hugger, but you have to be a little more responsible than that.
absolutely the reason we have such crazy enviro laws is because people still dump engine oil down the sewer
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Old 12-05-2010, 06:17 PM   #15
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I'm finding them from 165 to 195 and they are all marked as stock temp. What is the correct temp?
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Old 12-05-2010, 07:22 PM   #16
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ah brain fart sorry 195
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Old 12-05-2010, 08:52 PM   #17
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make sure you buy a fail safe thermostat it does cost 5 bucks more but can save the motor if it goes bad because it will open if it goes bad instead of closing and causing the motor to over heat like the cheap ones will.

spend the extra money.
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Old 12-05-2010, 09:09 PM   #18
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Won't the temp gauge just read hot?
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Old 12-05-2010, 09:42 PM   #19
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195 is what the factory says it should run at.
if your asking me if the temp gauge will read hot if a fail safe thermostat goes bad then the answer is no because it is designed to open if it fails so the coolant will still flow so it will run cool if anything and that is a lot better then over heating like a cheap stock thermostat will cause.
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Old 12-05-2010, 10:24 PM   #20
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195 is what the factory says it should run at.
if your asking me if the temp gauge will read hot if a fail safe thermostat goes bad then the answer is no because it is designed to open if it fails so the coolant will still flow so it will run cool if anything and that is a lot better then over heating like a cheap stock thermostat will cause.
great info! thx!
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Old 12-06-2010, 12:33 AM   #21
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I mean if a regular thermostat fails, won't the gauge just read hot?

I'd rather have that than not know that my thermostat is bad.
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Old 05-02-2011, 06:01 PM   #22
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So normal running temp is 210? Mine runs at 210 all the time and it kinda worries me. Thought about a coolant flush and a new thermostat. Should I not worry.
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Old 05-02-2011, 06:17 PM   #23
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Originally Posted by ISUSteve View Post
Thanks! I'll do that this weekend.

Do I need to worry about where the fluid is going to land if I don't drain the system?

Also, is there different temps thermostats?
As others have said use a catch bucket. antifreeze is toxic and if you have pets or neighborhood pets it will kill them slowly and painfully if they drink it as they will find it to be a tasty sweet treat that leads to kidney failure.
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Old 05-02-2011, 06:27 PM   #24
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I mean if a regular thermostat fails, won't the gauge just read hot?

I'd rather have that than not know that my thermostat is bad.
If the regular thermostat fails and stays closed, yes the gauge will read hot. If you run it hot like that you will overheat the motor and cause warping and likely a blown headgasket/ possibly catastrophic engine failure. You dont want that. If a fail safe thermostat fails it will always open and stay stuck open. You will notice that on the gauge because the temp will never raise over 140 ish.
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Old 05-05-2011, 02:48 PM   #25
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hwo do you take the clamps that have no screw/strap on them off?
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Old 05-05-2011, 03:17 PM   #26
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It depends on the type, some have opposite points that you squeeze together with pliers and slid up and off.

Another type has a strap around where the two ends meet. Those I have you had to cut off or mangle the smaller strap off. Then replace it with a standard screw driven clamp.
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Old 05-05-2011, 03:20 PM   #27
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It depends on the type, some have opposite points that you squeeze together with pliers and slid up and off.

Another type has a strap around where the two ends meet. Those I have you had to cut off or mangle the smaller strap off. Then replace it with a standard screw driven clamp.
in the picture posted above i have the clamps that are on the smaller hose...on both hoses on my thermastat housing.... i use pliers for that style?
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Old 05-05-2011, 03:23 PM   #28
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Yep, just squeeze them together and slide it back a few inches on the hose then release. you don't have to worry about losing the clamp because it will be with the hose at all times.
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Old 05-05-2011, 03:28 PM   #29
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Yep, just squeeze them together and slide it back a few inches on the hose then release. you don't have to worry about losing the clamp because it will be with the hose at all times.


ok awesome thanks. one more quick question...where would i drain some of the coolant out from? is there is 'drain hole/hose' somewhere?
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Old 05-05-2011, 08:41 PM   #30
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On my radiator there is a little valve at the bottom that you loosen and it will drain from there. depending on make an model, sometimes they are plastic, sometimes metal, sometimes the can come all the way out sometimes they just get loose enough to drain and stay in. Some even have a place to insert a hose to direct it. Mine is on the Drivers side.

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