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Old 06-23-2006, 09:32 AM   #1
Join Date: Oct 2005
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180* Thermostat

Now that the summer heat is here, I am debating installing a 180* t-stat to reduce engine heat. I have a 97tj, 4.0, headers, k&n filter (no chip) and really wanted to get the scoop.
My engine currently reads about 210* (jeep says this is correct)and I have the factory 195* t-stat (I understand that the engine ususally operates about 10-15* above t-stat rating).
I know that I would like the cooler temp on the engine, but will the performance be impacted (fuel/air mixture)? What will happen this winter? Will it run too rich? I don't want to have to swap t-stats summer to winter either.

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Old 06-23-2006, 10:53 AM   #2

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Yes 210 is correct with the 4.0L. I think changing it out is going to be more of PITA than its worth. Plus if its not broke don't fix it when it comes to a jeep.. seems like when i go messing around with stuff like that it always comes back to bite me...LOL

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Old 06-23-2006, 11:02 AM   #3
coilovers are damn flexy
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If you aren't having any issues with overheating, then the system is working as it should. I have never heard of anyone having various thermostats for different seasons. It is designed to work whether your in Alaska, or out here in the triple digit heat.
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Old 06-23-2006, 11:13 AM   #4
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unless you buy a Jeep like mine!

that came from the factory with NO thermostat installed!

Maybe my Jeep was built on a Friday afternoon or Monday morning

This is for the assembly line
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Old 06-23-2006, 02:32 PM   #5
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The 4.0L engine is designed to run at that temp. Changing the thermostat to run cooler will have adverse affects on your engine. You will see plugs fouling quicker, etc. Is there a reason that you want it to run cooler? Just curious
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Old 06-23-2006, 03:33 PM   #6
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Actually, I replaced the engine with a reman from Jeep and the oil pressure is lower than my original. Or at least I thought. 16-18 psi at idle (650rpms). I wanted to see if lowering the operating temp would help ever so slightly to reduce heat in the engine and extend life.
I may be thinking that the idle rpm's may be a little low and increasing the rpms my oil pressure would be back at around 20psi (700-750 rpms).
Oh well, just a thought.
Thanks for the feedback.
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Old 06-23-2006, 05:03 PM   #7
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I have the 180
cause everytime i would be out on the trail with the factory stat in i would get very close to overheating.. to the point where u could hear it bubbling and all that good stuff

97 Sport
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Old 06-25-2006, 07:58 PM   #8
Knows a couple things...

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Running a lower temperature thermostat doesn't help on a hot day. Think about it... if the engine is at 210 degrees (or hotter, whatever), both a 180 and 195 degree thermostat will be fully open. There will be NO difference. On a cold day, yes an engine may run cooler with a 180 degree thermostat.
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Old 06-25-2006, 09:37 PM   #9
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Personally i changed mine out to a 180 the first week after i bought the jeep. My buddy has a 97 wrangler and has went through 3 radiators. After he changed to the 180, still has the same one. Even when runnin hard in 4low in the 100+ degree heat here around panama city my temp doesnt range over 195 or 200. With the other thermostat the temp would push almost 230. Im happy with the change.
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Old 06-25-2006, 11:51 PM   #10
coilovers are damn flexy
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One also needs to take into consideration the condition of your radiator. If it is packed with mud, crud, or bugs, it will not cool as efficiently as a clean radiator will. It is also important to have them flushed every so often, to keep the inside nice and clean.
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Old 06-26-2006, 12:05 AM   #11
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I run a 180* thermostat; but not because of overheating problems. I run it since it will run at 195* with one. At this temperature, due to my Jeep being somewhat older than most TJs (especially 2.5L TJs), and a bit more finnicky, the engine just runs the smoothest and seems happiest, and doesn't have ANY pings EVER no matter how badly I bog it down driving it, something it's always done a little bit since the day I got it with the 195* factory thermostat, but has been getting worse once I breached the 130K mark, SeaFoam seems to fix it, but it comes back within a few weeks (33"x13.50 LTB's on 4.10's = a big load for this tiny guy, on the lighter MT/Rs it wasnt bad but with these it is). 195-235* is the factory recommended operating temperature. At 165* the PCM has the option to drop out of open loop mode and into closed loop (hence 165* thermostats can give you problems in fuel injected vehciels) so running no, or a cold thermostat wont help you either.

As Jerry pointed out - running a cooler thermostat wont fix overheating problems at all - it will give you 15* more of 'temperature' you have to rise through to get to overheating, but if you have cooling problems you'll get there none-theless

//1998 Jeep TJ {'4\"', 'TFLX LAT', 'AA HD SYE', 'HF 8000Lb', 'LockRight', 'Armor', 'Body mods', 'Misc Mods' = 'true' };
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