Hi, I have XJ8 model 2003 , there are many times come out for check coolant temp. I check the coolant but the coolant is about to full !! Any one tell me where is the problem , and how to fix it pls ??

 

Do you mean the warning says “coolant level low” or “check coolant level”? Or is it a temperature warning like your post title says?

 

If you are getting a temp alert -- do not drive the car until you find the problem. Is the temp gauge going into the red? The gauge had a dead zone where it sits in the normal range for an extended temp range -- its not linear with actual engine temp. It's overheating if going above -- find the cause before damage is done.

If you are getting a coolant level warning === check coolant. The level needs to be very high in the tank .. if not any sloshing around can set off the warning. The float can also get soggy and sink a bit ... a new one will fix.

 

 

you can replace the sensor --- only replace the tank if leaking

 

We still need to know what is really going on. Trouble with English language: need to be specific. Is it overheating, or telling you you need to add fluid? If either of these, the advice above will help you solve the problem. But, you might also have a bad temperature sensor (it is located in the crossover pipe in front of the engine). A good OBD II reader can answer some of these questions.

 

 

I thought I was clear: do nothing until you know what is really wrong!