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Unread 09-24-2013, 10:49 PM   #1
burgundyjeep
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1999 WJ 
 
Join Date: Mar 2013
Location: Livermore, California
Posts: 5
Wj WJ Wont come up to operating temerature

i have a 1999 Jeep Grand Cherokee and the new motor we put in it wont come up to temperature. It sits right at the mark between 100 and 210. The only way it ever gets near 210 is if its 100 degrees outside. We ran diagnostics and the it says its at 150 most of the time. anybody have and ideas?

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Unread 09-24-2013, 11:05 PM   #2
new2site
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2002 WJ 
 
Join Date: Jan 2012
Location: Orange county, CA
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Stuck open thermostat ...?
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Unread 09-24-2013, 11:07 PM   #3
Jaspah
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Quote:
Originally Posted by new2site View Post
Stuck open thermostat ...?
That's my guess.
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Unread 09-24-2013, 11:08 PM   #4
COL
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Thermostat is stuck open. You need to replace it. I believe they come with 195* T-stats stock, but you could go to a 180* too.
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Unread 09-25-2013, 10:26 PM   #5
burgundyjeep
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That's what i thought at first but it is still doing it.
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Unread 09-25-2013, 11:33 PM   #6
COL
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Did you put a T-stat in it? Did you check to see if your gauge is accurate? Warm it up by driving it ten miles then use a thermometer to actually see how hot the coolant is. Inferred laser thermometers work great.
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Unread 09-26-2013, 08:11 PM   #7
burgundyjeep
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Believe it or not me and my dad did all that. The new thermostat might be stuck so we just ordered a new thermostat today and were going to put it on. Ill let you know what happens.
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Unread 09-26-2013, 08:59 PM   #8
pinky2252s
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2001 WJ 
 
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Quote:
Originally Posted by burgundyjeep View Post
Believe it or not me and my dad did all that. The new thermostat might be stuck so we just ordered a new thermostat today and were going to put it on. Ill let you know what happens.
Boil the thermostat you have and see if it opens and closes.
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Unread 09-28-2013, 05:55 AM   #9
burgundyjeep
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1999 WJ 
 
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Location: Livermore, California
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Boiled it and it didn't work, but we did put a new thermostat in and that's working fine now. I believe it was a 195*.
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