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Old 09-13-2008, 12:38 PM   #1
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thermostat

I've seen some write ups about changing out your stock thermostat to a cooler running one like a 180. Should I do this and what would the benifits be?

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Old 09-13-2008, 01:42 PM   #2
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No benefits I can think of, the only thing I can think of that would improve cooling would be to increase capacity with a bigger radiator. The engine needs to run at 190F, when you first start it up cold the engine run rich, the ECU is not controlling the injectors yet, at around 180F the ECU takes over and start leaning the engine out and making it run more efficiently. Run without a thermostat and your mileage will drop in half. Both the I6 and I4 like running just a shade under 210 on the temp gauge. If you do replace it make sure it has the small bleed hole in the flange, that gets trapped air out. You will always be good if you stick with the OEM one.

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Old 09-13-2008, 02:02 PM   #3
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The benefit?
On cold days:
Your heater won't warm up as well.
The engine will use lots more fuel.
The mileage will radically drop.
Emissions will be higher.
Plugs will foul easier.

On hot days it'll still run just as hot as before - no change.
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Old 09-13-2008, 03:19 PM   #4
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Hmmm... Thanks i'll stick with oem. I did notice though that Jet brand programmer chips made for the TJ suggest to use one of their 180 degree thermostats along with the programmer chip.
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http://i160.photobucket.com/albums/t...2/untitled.jpg
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