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Unread 10-28-2009, 12:00 PM   #1
tsteiden
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160 degree thermostat - what's the point?

Been trying to figure out why my 98 TJ won't get very hot. I thought the thermostat was stuck open, but discovered a 160 degree thermostat installed instead of the (apparently) OEM 192 degree.

I'm going to change it back so I can get some heat, but why was it changed to 160 to begin with? Has this been stealing mileage by running too cool? I'm a little worried about changing to 192 because I may discover why it was changed to begin with. Could it just be a regional thing?

I hate surprises. Ideas? Answers?

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Unread 10-28-2009, 12:03 PM   #2
TheBoogieman
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You should never go below the OEM thermostat temp range.I thought it was 185.Maybe they thought it would make the engine last longer.
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Unread 10-28-2009, 12:07 PM   #3
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OEM is a 195*
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Unread 10-28-2009, 12:13 PM   #4
JBTJ
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Owner before you probably thought it would help, which it won't. Just put in the 195 degree stat that's what the motor likes. Don't worry about it. It will be fine.
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Unread 10-28-2009, 12:16 PM   #5
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I thought the purpose of a low temp thermostat in theory was to run the engine a little cooler to slightly increase the power, but that for it to be effective you needed a programmer to let the ecu know...then again i am more familiar with using them in sports car apps, not a jeep...
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Unread 10-28-2009, 12:16 PM   #6
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Quote:
Originally Posted by GOLENJEEPTJ View Post
OEM is a 195*
I stand corrected by you(as usual).I'll be over for Halloween for a visit.
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Unread 10-28-2009, 01:18 PM   #7
tsteiden
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Good answers - you are right - it's 195 - that should warm things up a bit in the cab!
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Unread 10-28-2009, 01:31 PM   #8
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I run a 180 in mine. A 180 thermostat still lets the engine run around 195 which the computer is still happy with and keeps me at around 1/4 on the temp gauge. I just like the fact that if things start to heat up, I have a little more cushion before it goes into the red. Plus, I still have plenty of heat. just my .02
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Unread 10-28-2009, 01:39 PM   #9
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Originally Posted by spdnjoe View Post
I run a 180 in mine. A 180 thermostat still lets the engine run around 195 which the computer is still happy with and keeps me at around 1/4 on the temp gauge. I just like the fact that if things start to heat up, I have a little more cushion before it goes into the red. Plus, I still have plenty of heat. just my .02
I think you would be better off with the factory recommended 195*.

MPG will be better.

Emissions will be better.

Your oil will stay cleaner.
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Unread 10-28-2009, 01:42 PM   #10
fishinjeeper
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my neighbor was telling me how he took them out of this vehicles so they wouldn't over heat. i laughed...
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Unread 10-28-2009, 01:44 PM   #11
spdnjoe
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I get 17-19 mpg on the highway and I just passed California emissions 2 weeks ago.
I've done this with every offroad vehicle and tow vehicle I've owned in the last 15-20 years and have never had an issue.
Everyone has there own opinion and views, I'm not saying mine is right or wrong, I'm just telling you what I did to mine and it's fine.
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Unread 10-28-2009, 01:45 PM   #12
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Most likely the t-stat went bad on the PO and he didn't know any better, or let some kid at the parts store talk him into the cooler one.
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Unread 10-28-2009, 01:47 PM   #13
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Quote:
Originally Posted by spdnjoe View Post
I get 17-19 mpg on the highway and I just passed California emissions 2 weeks ago.
I've done this with every offroad vehicle and tow vehicle I've owned in the last 15-20 years and have never had an issue.
Everyone has there own opinion and views, I'm not saying mine is right or wrong, I'm just telling you what I did to mine and it's fine.
No problem, we disagree on this.

I tried a 180 t-stat in my TJ for some time, but I eventually went back to the 195. I did not see any benefits with the 180 t-stat. It only made things worse for me.
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Unread 10-28-2009, 01:51 PM   #14
spdnjoe
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no worries my friend.
It's all good. The nice thing of a forum is that people can post their opinions and don't have to take things personally. It's just a persons opinion.
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Unread 10-28-2009, 02:04 PM   #15
tsteiden
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I'm glad to know there are options - If I lived in CA like my fortunate friend, 160 would be a go for me too, but my friend in Michigan says 180 - that makes sense too. I don't really stress the thing too much and not freezing is high on my list here in the midwest so the 195 OEM is probably my choice.
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