Hello, long time lurker first time poster. I was wondering if I could get some help. I have an 01 XJ 4.0 Sport. The temperature gauge stopped working. I ran the key test and saw the gauge go thru it's cycles, so the gauge cluster itself looks to be fine. However, I am trying to figure out where the temperature sending unit is, and that is where my confusion lies. I apologize as I am not that mechanically inclined, but I am confused as to determining if my engine has 1 sending unit or two. I know where the coolant sensor is attached to the top of the water pump and from what I read I should also have a temperature sending unit at the back of the engine as well. My best attempts at google make it sound like I should have two, but I don't really see anything that looks like the sending unit on the driver side rear top of the engine. So I am just looking for confirmation on how many temperature units should be on an 01 4.0, and if I am just plain missing it.

Best Regards,
Victleo

 

There's only one on the 01 and it's on the thermostat housing. The computer reads it's output, then displays it on the gauge. The computer uses it's output to control mixture settings and other things as well.

 

Thanks alot. Anyone got the Mopar part number for it?

 

https://www.rockauto.com/en/moreinfo...373666&jsn=462