normal operating temperature? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > normal operating temperature?

XHD Heavy-Duty Hood Latches for JK and TJ available at OcoStainless Steel Door Hinge PinsPoly Door Hinge Bushings

Reply
Unread 02-21-2010, 04:09 PM   #1
linusb
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Lexington,SC
Posts: 1,767
normal operating temperature?

I replaced my temp sending unit and my radiator today. My YJ is new to me. Temp gauge was not working previously but is working now. Operating temp seems to be 220-230 range. Is that ok? Motor is I6.

__________________
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
linusb is offline   Reply With Quote
Unread 02-21-2010, 04:18 PM   #2
wyattarnall
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: oregon
Posts: 96
that is not ok u r risking engine damage and blowing hoses running that hot u shouldn't be getting hotter than 210. do u have a shroud around the engine fan?
wyattarnall is offline   Reply With Quote
Unread 02-21-2010, 04:24 PM   #3
linusb
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Lexington,SC
Posts: 1,767
Yes, I do have a shroud. I do need to make sure that I don't have any air in my system since I just replaced the rad. Any other reason it would run hot? Weather was about 65 degrees out today.
__________________
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
linusb is offline   Reply With Quote
Unread 02-21-2010, 04:27 PM   #4
wyattarnall
Registered User
1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: oregon
Posts: 96
thermostat not opening? or check for vaccum leaks around ur intake manifold, while it's running spray starting fluid around the intake ports and see if it bogs ur engine down.
wyattarnall is offline   Reply With Quote
Unread 02-21-2010, 05:33 PM   #5
mario figueroa
Registered User
1988 YJ Wrangler 
 
Join Date: Sep 2007
Location: california
Posts: 297
Check your fan clutch front stat,if it is oily replace it.
mario figueroa is offline   Reply With Quote
Unread 02-22-2010, 06:12 PM   #6
linusb
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Lexington,SC
Posts: 1,767
Would replacing the thermostat with a lower temperature one work to lower my engine temperature?
__________________
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
linusb is offline   Reply With Quote
Unread 02-22-2010, 06:18 PM   #7
sitdwnandhngon
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2008
Location: Cincinnatus, NY
Posts: 1,347
Quote:
Originally Posted by linusb View Post
Would replacing the thermostat with a lower temperature one work to lower my engine temperature?
It may mask and underlying problem for a while.

With the motor off (obviously) check both the fan shaft and fan clutch for a wobble or wear. If the shaft is moving or you are leaking fluid from behind the water pump then the water pump is bad.

If the fan blades wobble on the shaft and spin without any resistance then the clutch is going bad.

With a 190 thermostat my engine never goes about 210, even on the hottest summer days.

Also like you said try purge the air from the system take the radiator cap off and run the motor until the thermostat opens and watch for big bubbles to come out, be careful not to get burned.
__________________
I can't bear the thought of losing, I dread the attention winning brings

Quote:
Originally Posted by northjeep View Post
4.2 has 0.2 more!
sitdwnandhngon is offline   Reply With Quote
Unread 02-22-2010, 06:56 PM   #8
linusb
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Lexington,SC
Posts: 1,767
Thanks for the tips. Fan and clutch seem good...there is good resistance when trying to spin by hand...only moving a few inches when spun freely. No signs of any leaks at pump or clutch. I'm pretty sure I have all the air out of the system but if it's anything like my BMW was, it took a week to get it all bled out. In the case of the BMW the problem of an air bubble was a lot more obvious as the temperature gauge would spike and drop within a few seconds.

If none of that works I'll run a new thermostat and see what happens. When a thermostat fails, is one type of failure not opening all the way?
__________________
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
linusb is offline   Reply With Quote
Unread 02-22-2010, 07:40 PM   #9
sitdwnandhngon
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2008
Location: Cincinnatus, NY
Posts: 1,347
Yes, and you can actually test it. Put it in a pan of water on the stove and get a meat thermometer. Then watch for it to open between 180 and 200. If it doesn't you may need a new one.
__________________
I can't bear the thought of losing, I dread the attention winning brings

Quote:
Originally Posted by northjeep View Post
4.2 has 0.2 more!
sitdwnandhngon is offline   Reply With Quote
Unread 02-22-2010, 10:15 PM   #10
MJMPC
Registered User
1991 YJ Wrangler 
 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,070
Where on the motor was the temp sensor you replaced?
__________________
MIKE

http://www.dav.org/

MJM Powder Coating
Elizabethtown Ky.

http://www.cityprofile.com/
MJMPC is offline   Reply With Quote
Unread 02-23-2010, 05:33 AM   #11
linusb
Registered User
1994 YJ Wrangler 
 
Join Date: Aug 2009
Location: Lexington,SC
Posts: 1,767
It's at the back of the motor...it's the stock sensor location. Sensor is new, original gauge.
__________________
1994 YJ Wrangler, 4.0, AX15, NP231, 35x12.50x15 BFG KM2s, 4" RC lift, 1" lift Boom Shackles, 1" BL, 4.10 gears, 8.8 LSD in rear and D30 Aussie Locker in front, on-board air conversion, Ramsey RE8000 winch.
linusb is offline   Reply With Quote
Unread 01-29-2011, 05:40 PM   #12
argo77
Registered User
1987 YJ Wrangler 
 
Join Date: Nov 2010
Location: San Antonio, TX
Posts: 4
I have the same problem man. I have new water pump, new thermostat. I flashed the system and bled all air out of the system. It runs about 225 F when the jeep is idle. I didnt know what to do anymore. I am going to replace the clutch on the fan. My buddy told me that on the idle at 7-800 rpms, the water that flows through the system at the low pressure. When you give it more gas and your rpm increase more water flows through the cooling system and it cools it down faster.

Let me know what works for you.
Thanks,
argo77 is offline   Reply With Quote
Unread 01-29-2011, 07:18 PM   #13
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 14,565
You need to burp it. If you allowed air into your cooling system the air needs to get out.230 is hot but shouldn't blow your engine. Burping it.
Que89YJ is offline   Reply With Quote
Unread 01-29-2011, 08:33 PM   #14
GottaYJ
Registered User
1995 YJ Wrangler 
 
Join Date: Jul 2010
Location: Phoenix, Arizona
Posts: 285
Was the sending unit oem or aftermarket, because there have been several threads with malfunctioning aftermarket units that read high when the temp is really within the normal range.
GottaYJ is offline   Reply With Quote
Unread 01-29-2011, 09:24 PM   #15
argo77
Registered User
1987 YJ Wrangler 
 
Join Date: Nov 2010
Location: San Antonio, TX
Posts: 4
You know guys you are correct. I had to rebuild the head. I bought the after market temperature sender and it jumps like crazy. What is the best way of burping it? I am afraid to blow a hose or overheat the engine.
Thanks a lot for your help,
argo77 is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.