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Unread 05-25-2010, 11:02 PM   #1
WVFishandHunt
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2000 XJ Thermostat Help

Hey everyone i just got done swapping the engine in my xj and now my dad went out and bought a 165 thermostat to install instead of the stock thermostat. Any thoughts on this? Will this negatively effect anything? Any and all help is appreciated

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Unread 05-25-2010, 11:08 PM   #2
troys96xj
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It'll be fine. I would run a 180 or 190 though.
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Unread 05-26-2010, 10:32 AM   #3
tjwalker
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For a daily driver, use the 195 degree stat. Don't install the 165.

Your engine is designed to run most efficinetly with the 195. Don't second guess the design engineers on this one.....
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Unread 05-26-2010, 04:04 PM   #4
djb383
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Everybody second guesses the design engineers............it's called "mods". LOL
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Unread 05-26-2010, 04:06 PM   #5
kbad
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no way 165....listen to TJ or go at least 180+, dude! ....and upgrade your water pump while you are at it - much better for your engine than the stock crap - better turbine, larger volume, higher performance rating to match up to the 195 thermo and upgrade your rad hoses too.

also....consider running synthetic oil and use a high performance/higher capacity oil filter (e.g. fram fr-hp1 or mopar performance) - more oil to keep your engine cooler

and...hope you are not using the stock, bulky motor fan and the useless electric fan?!?....get rid of both and instead use dual 16" electric fans - a lot less load on your engine and it will run more efficiently, plus you can automatically/manually run them individually/together...

hey TJ, what's up? ...my 96 stock was 165??? and i replaced it with 190....does stock 2000 come with 195? wow!
...and where are you at up there in MN?...i used to go to BSU up in berrrrmidji back in 82-84, my uncle used to own the Chief Motel in town.

Last edited by kbad; 05-26-2010 at 04:32 PM..
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Unread 05-26-2010, 04:17 PM   #6
z06rider
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Quote:
Originally Posted by tjwalker View Post
For a daily driver, use the 195 degree stat. Don't install the 165.

Your engine is designed to run most efficinetly with the 195. Don't second guess the design engineers on this one.....
excatly, if the engine never warms up the computer stays in "warm up" mode, then you end up with worse gas mileage and emissions output.

in OBD1 and 2 cars they are programmed/desigend to run within the original thermostat temp range installed...

it could always be re-programmed though, but i wouldnt waste you money.
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Unread 05-26-2010, 06:44 PM   #7
djb383
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Quote:
Originally Posted by z06rider View Post
excatly, if the engine never warms up the computer stays in "warm up" mode, then you end up with worse gas mileage and emissions output.

in OBD1 and 2 cars they are programmed/desigend to run within the original thermostat temp range installed...

it could always be re-programmed though, but i wouldnt waste you money.
The computer leaves "warm up" mode and enters "closed loop" or "clean/lean" mode when the O2 sensor(s) reach operating temp. This is less than a minute after engine start-up and well before coolant temp reaches normal.

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Unread 05-26-2010, 10:26 PM   #8
WVFishandHunt
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thanks everyone...he told me that he bought the 165 and i knew from reading enough threads that it wasnt a great idea. i just wanted to double check. kbad he did buy a better water pump and radiator and we have always ran synthetic and high quality oil filters. I am also planning on swapping the fans. i just need to get it back first. it is in erie pa and i am in morgantown wv cuz i dont have the space to do an engine swap. once again thanks everyone for confirming what i though
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Unread 05-26-2010, 10:53 PM   #9
kbad
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....clarification on the oil filter....the high performance ones have a larger capacity than stock...about a 3/4 to 1 qt more or so.....more oil to protect your engine.
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Unread 05-27-2010, 10:01 AM   #10
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by kbad View Post
hey TJ, what's up? ...my 96 stock was 165??? and i replaced it with ....does stock 2000 come with 195? wow!
...and where are you at up there in MN?...i used to go to BSU up in berrrrmidji back in 82-84, my uncle used to own the Chief Motel in town.
I wasn't aware that any of the 4.0 engines came with the 165 degree stat from the factory.....My understanding is that they were all 195. It is the only temp stat I've ever installed on the 4.0.

kbad...I live near Melrose MN on Big Birch Lake. I used to date a girl from BSU back in my college days. Yup, it is still referred to as brrrrrrmidji! It can be ridiculously cold here some winter days (-30 f not unusual) but is pretty nice spring through fall.
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