Anthony'90XJ

I have a '90 XJ 4.0 and went through a PRETTY DEEP mud pit the other day. After a couple more minutes of wheeling, my temp. dummy light came on. The XJ didn't seem hotter than normal, but I shut her off anyway. After a while, I turned her on and the light was still on. I continued my afternoon of wheeling, and drove the 45 minutes home with no bubbling noises or anything like that. The XJ has been still for about a week and a half, and when I decided to take her to work today, about 5 - 10 minutes into my drive, the light came back on. In about 5 more minutes I got to my job, popped the hood and checked my reservoir. It was still full, and the radiator felt warm, not hot. I could actually leave my hand on there with no discomfort whatsoever. As for the cooling system, I have a new (2 -3 months old) fan clutch, and an always-on electric fan. The coolant still looks green and nothing seems out of the ordinary. Also no leaks that I can see and there are no puddles where I park. The only thing I can figure is that something got messed up while wheeling in the mud, like a connector or something. Any help is GREATLY appreciated!!!

Anthony'90XJ

The pit I went through that probably jacked up the sensor.....

freegdr

replace the sender rear drivers side of cyl head .

djb383

If one drives off into something that deep, I'd suggest a mechanical gauge(s).

Anthony'90XJ

Yeah.... Hahahaha. That's pretty close to the top of my list. And that's not the deepest part.......

Radi

More pics please.

Anthony'90XJ

Some more shots of that day.

Anthony'90XJ

The aftermath