FASTMETAL

Where is it located? my gauge just started readin low then normal then back to low,, level is fine too

Nemx735

kinda like this? mine does the same thing not sure why i replaced the sender which btw is to the right on the upper radiator hose on the tstat housing on the front of the head. im gunna be replacing my engine wire harness soon to try and fix it

sems

I would definitely check more before changing the engine wiring harness. The connector on the back of the gauge cluster likes to corrode, causing erratic gauge readings. Just my personal opinion, but I would definitely check that before you get too carried away.

The temp. sensor uses a 5V reference, then changes resistance with heat. The check engine light will come on if the sensor is out of range. Typical range is 0.5V-4.5V. If it was a problem with the wiring harness it would most likely cause the sensor to read out of range, causing the check engine light to come on. If the check engine light is not coming on I would doubt (from my experiences) that there is a problem with the wiring harness.

djb383

Check the wires and connector 1st.

FASTMETAL

cool ill go over that b4 i buy on,, plus auto zone and pepboys dont even carry these

Nemx735

my check engine light is on p0117 sorry to hijack thread

mdr121982

I actually hit the junk yard to find the wiring harness for my 98 Cherokee Sport but could not find the proper year. So I took what they had out of a Grand Cherokee. I just changed the temp sensor out in mine to the one used in a Grand Cherokee and put the harness on from the junk yard and it worked like a charm and solved the problem. No crazy temp readings now and no check engine light on now.

BobIsAwesome

In my XJ, a 92, the temp sender is at the very back of the engine, next to the valve cover. What year did they drop that and pair it with the temp sensor at the t-stat?

Just curious.

xj^REMY

EDIT: just saw the date this thread was brought back from....just another thread with no resolution

97+ the temp sensor was relocated