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Old 06-21-2009, 04:51 PM   #1
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Thermostat replacement opinions

Alright i gave a friend of mine a ride home one night and it was his first time in the jeep after looking at the temperature he was real suprised it was reading about 210. its really a hair under 210 but anyway he said his SUV runs around 180 and said i should put in a new thermostat set at 180 to make my engine last longer. It makes sense but my thinking is that this is the way i heard they all run or thats what i heard after search the forum. so whats the thoughts? would it help run better? what about gas mileage and would it hurt to run at 180? i have a 00 TJ sport w/4.0L I6

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Old 06-21-2009, 04:54 PM   #2
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Normal for the 4.0L jeep. No worries. If it gets up over 210* then you need to think about replacing it with a 195* as it has in it now.

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Old 06-21-2009, 05:17 PM   #3
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Your engine was designed to run right at 210 and is most efficient at that temperture. Ignore your friend's misguided recommendation to install a 180 degree thermostat, stick with the factory spec'd 195 degree thermostat. Installing a 165 or 180 degree themostat just makes the engine take longer to warm up to its designed-for 210 degrees. And since even the 195 degree thermostat is wide open at 210 degrees, installing a 165 or 180 degree thermostat will not make the engine run any cooler in normal conditions. The ONLY time a 165 or 180 degree thermostat would make it run cooler is in extremely cold climate conditions where that would not be a good idea since it would take a long time for the engine to warm up, likely causing a Check Engine light as well. The heater wouldn't work as well either.
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Old 06-21-2009, 05:18 PM   #4
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Originally Posted by Ej132 View Post
Alright i gave a friend of mine a ride home one night and it was his first time in the jeep after looking at the temperature he was real suprised it was reading about 210. its really a hair under 210 but anyway he said his SUV runs around 180 and said i should put in a new thermostat set at 180 to make my engine last longer. It makes sense but my thinking is that this is the way i heard they all run or thats what i heard after search the forum. so whats the thoughts? would it help run better? what about gas mileage and would it hurt to run at 180? i have a 00 TJ sport w/4.0L I6
a 180 thermostat opens at 180 it dosent mean your engine runs at 180
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Old 06-22-2009, 07:02 AM   #5
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thanks for all the info guys ill just ignore him now.lol
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