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Unread 09-05-2011, 10:13 PM   #1
redrubi03
Registered User
1989 YJ Wrangler 
 
Join Date: Sep 2010
Location: Phoenix
Posts: 272
thermostat

anyone running a cooler thermostat? im thinking of switching to a 180 for the hot weather here? any pros or cons?

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Unread 09-05-2011, 10:17 PM   #2
Alabamaranger
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1990 YJ Wrangler 
 
Join Date: Sep 2006
Location: Leeds AL, Alabama
Posts: 1,715
I run a 160 degree. The engine is nutter, so no computer stuff. When offroad, it reads about 180 under a load.
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Unread 09-06-2011, 06:12 AM   #3
nembudonna
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1990 YJ Wrangler 
 
Join Date: Feb 2011
Location: northwest, ark.
Posts: 903
I run a 160 without any problems.
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Unread 09-06-2011, 06:45 AM   #4
notmyj
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1992 YJ Wrangler 
 
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Location: Pittsburgh, Pennsylvania
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Shouldn't make a damn bit of difference. If it runs good in the winter at 210 it will still run at 210 in the summer, unless their are other issues. No matter what the temp is outside a 210 thermostat will still make the engine stay at 210. Even in 100+ heat it should be able to prevent over heating. If it does over heat, then a cooler thermostat wont help it.

I never under stood the logic behind changing thermostats for different weather. I can only attribute such an idea to unfamiliarity with the operation of a vehicle cooling system...
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Unread 09-06-2011, 07:44 AM   #5
redrubi03
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1989 YJ Wrangler 
 
Join Date: Sep 2010
Location: Phoenix
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Quote:
Shouldn't make a damn bit of difference. If it runs good in the winter at 210 it will still run at 210 in the summer, unless their are other issues. No matter what the temp is outside a 210 thermostat will still make the engine stay at 210. Even in 100+ heat it should be able to prevent over heating. If it does over heat, then a cooler thermostat wont help it.

I never under stood the logic behind changing thermostats for different weather. I can only attribute such an idea to unfamiliarity with the operation of a vehicle cooling system...
actually a vehicle will always run a bit warmer unless you set your fan temps to the thermostat temps. i have a 195* tstat as is and i run 210 all day long. my suburban has a 195 and runs 210 all day long. my bike has a 195 and runs 208 all day long. it runs these temps cuz the fans are what cools the coolant... not the tstat. all the tstat does is open up to allow the coolant to start flowing through the radiator instead of through the bypass hose back into the motor to warm up. when riding my bike hard on the streets and coming to a stop my temps will start to climb from about 198* all the way up to sometimes 230* but as soon as it hits 208 my fans kick on. if you didnt have fans you would keep climbing until you started moving fast enough again to sufficiently cool the motor.

yes i know a 195* thermostat will run at about 210* all day long no matter what weather you are in. mine has done it for the last year ive owned it from 118 degree days to 40 degree nights it runs at 210 at operating temp. im simply wanting to switch so my motor runs cooler and was wondering if anyone has had any problems running a bit cooler than from the factory.

what is "nutter" btw?
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Unread 09-06-2011, 08:23 AM   #6
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,444
I looked at your profile and it says a 4.0L on an 89. If you are set up with a 4.0L mpfi instead of the 4.2L carbed then my answer is not to modify more then 180. The computer need the engine to operate at 195 for the calibration and by running a cooler thermostat you end up never going into closed loop for the ECU calibration. If you are running the 4.2L with the nutter then the ECU is bypassed and you should be fine.
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Unread 09-06-2011, 02:02 PM   #7
redrubi03
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1989 YJ Wrangler 
 
Join Date: Sep 2010
Location: Phoenix
Posts: 272
I don't plan going lower than a 180. The thermostat will just open sooner than the 195 but my operating temps will be the same.

what is nutter btw?
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