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Old 04-04-2014, 12:40 PM   #1
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180 degree thermostat

Got a 06 and the 4.0 runs around 210 was thinking about get a 180 degree thermostat to get it to run alittle cooler. Any thoughts?

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Old 04-04-2014, 12:41 PM   #2
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Why? 210 is where it's suppose to be.

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Old 04-04-2014, 12:49 PM   #3
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Your jeep will high idle all the time. Notice how it runs fast until it gets to temp then goes down to that really low idle. You will jack that up.
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Old 04-04-2014, 12:49 PM   #4
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Just so there would be alittle less wear and tear when under load.
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Old 04-04-2014, 12:52 PM   #5
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Wouldn't it just kick down when it got to the new operating temp of the thermostat?
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Old 04-04-2014, 12:52 PM   #6
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30 degrees won't make a difference on wear on steel. If anything your oil will be slightly thicker reduce gas milage and cause more wear. All in such a small amount you wouldn't notice though. Plus the high idle all the time will accelerate wear.
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Old 04-04-2014, 12:53 PM   #7
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Quote:
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Just so there would be alittle less wear and tear when under load.
That's solving a problem that doesn't exist. The 4.0 was engineered to run at 210.
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Old 04-04-2014, 12:53 PM   #8
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Quote:
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Wouldn't it just kick down when it got to the new operating temp of the thermostat?
No it's mechanical. It will just never get to operating temp and idle high trying too infinitely.
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Old 04-04-2014, 12:56 PM   #9
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Good to know. That's why I asked
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Old 04-04-2014, 10:53 PM   #10
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Your gas mileage will also go to pot as the computer will dump more and more fuel trying to get the engine up to temp.
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Old 04-04-2014, 11:58 PM   #11
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If your worried about heat you could install a hood louver.
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Old 04-05-2014, 12:07 AM   #12
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The engine computer is programmed around the correct 195 degree thermostat, I wouldn't go to a lower temp model. Not to mention the engine is more efficient & will get better mpg with the proper 195 degree thermostat. Installing a 165 or 180 degree thermostat would just slow the engine's warm up cycle and cause worse mpg since the computer is programmed to set the fuel mixture rich until the engine reaches its designed for temp. The normal 210 degrees the engine runs at is what it was designed for so stop worrying about it.
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Old 04-05-2014, 12:25 AM   #13
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Yea was just an idea but thanks for the input. And I got louvers on the hood already. Thanks again
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Old 04-24-2014, 11:30 AM   #14
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Tried putting 180 thermostat in wifes 05 did not change temp she runs a mail route with it stop and go all day engine would over heat on hot days above 90 finally installed new heavy duty radiator seems to be working better
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Old 04-24-2014, 03:30 PM   #15
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That's not surprising the 180 degree thermostat didn't help the engine run cooler in hot conditions, it can't and that's not the purpose of the thermostat anyway. Once the engine is hot enough to start overheating, the factory specified 195 degree thermostat has long been wide open already. Lower temp thermostats can only make an engine run cooler in cool ambient weather conditions.

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