Sep 21, 2015, 03:49 PM
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XJ Ask the Question Thread
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
I got the 99 4.0 up to temperature this afternoon and then tested the coolant temp sensor ohms. I got 810. The ohms should be around 185. A 810 reading tells the computer the engine is not warm. The current reading has the computer thinking coolant temp is between 100 and 130F.
If anyone knows, how much will a bad coolant temp sensor effect gas millage?
If anyone knows, how much will a bad coolant temp sensor effect gas millage?
Senior Member
Joined: Aug 2012
Posts: 583
Likes: 0
From: Clear Lake, TX
Year: 1999 Jeep Cherokee
Model: Cherokee
Engine: 4.0
Newbie
Joined: Mar 2014
Posts: 8
Likes: 0
From: VA
Year: 1999
Model: Cherokee
Engine: 4.0 In Line 6
Not sure where to post this, just joined. Hope here is OK
I have a 1999 Cherokee Sport that has started having problems with the electric cooling fan. It has stopped coming on and allowing my temp gauge to stay at a higher point than it normally does. I jumped my fan directly to the battery to make sure that it was still functional and it is. I found the relay under the hood and manually activated it which made the fan come on. The fan will not come on with or without the A/C on and although the temp gauge is only at 210 it used to come on around 210 and drop it down to 185 and I know that it would also come on with the A/C and now will not. I have found the temp sensor on my thermostat housing. Just trying to locate the sensor that will activate the fan. Also note that when the temperature gauge is at 210 with the heat on at full hot and the blower fan on high it blows cool air in the cab. Please help any suggestions are welcome.
Still love my first Jeep ! Just frustrated.
Still love my first Jeep ! Just frustrated.
CF Veteran
Joined: May 2011
Posts: 6,098
Likes: 250
From: DE
Year: 1988
Model: Cherokee
Engine: I6 4.0
Junior Member
Joined: Aug 2012
Posts: 100
Likes: 0
From: West Columbia, SC
I have a predicament. My xj will not pass new york saftey inspection. I can not afford to replace the windsheild that has acrack in it about six inches long in the center of the windsheild aand needs a cat. It has a new oil pan, new radiator, new thermostat (160), and new plugs wires cap and rotor. I don't have room to part it out or a place to and I can't ship the vehicle because of lack of funds and suggestions? She runs great so I don't wanna junk it and I can't store it till I get funds.
CF Veteran
Joined: Sep 2010
Posts: 12,692
Likes: 6
From: Mercer County, NJ
Year: 2001
Model: Cherokee
Engine: 4.0L I6 HO
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
I can't give solid advice cause I don't know you or anything about your situation. You may be able to get it through inspection if you're friendly with the right person 
If everything you typed is airtight, it sounds like you may need to sell it or call a favor from somebody.
If everything you typed is airtight, it sounds like you may need to sell it or call a favor from somebody.