The coolant level light keeps coming on when I start the car. I will disappear on its own and does not come on 100% of the time. What do you think is the issue?

Is it a sensor? Can it be cleaned? The coolant level is fine as is the water temperature.

 

I had an issue similar to what you describe, except the coolant level was actually a bit low. If the car is worm - the level appears OK, but that's just because the fluid expands.

Turns out my coolant expansion tank was leaking from the breather hose connector - very small leak, but enought to trip the sensor at one point.

 

OK, I will take a look under the bonnet today. I have never seen anything under the car, but I admit it has been a while since I actually looked at the level

 

I also had to have the coolant expansion tank relaced on mine last year as it had started to leak slightly, on the uk forum there have been several mentioned that had leaked so I think it is a slight problem in the X350 model.

 

(ref. '04 XJ8 w/160L miles)

Yep; I had to replace my coolant expansion tank, too...same leakage issue. That was two years ago at about 110 miles.

relinuca

 

Much to my suprise, the coolant was low! Sensor works as it should. Fluid was right below the minimum mark, so I filled it to the max mark (about 1 cup of fluid) and will monitor for leaks. Never seen any fluid on my parking space.

Up till now, car has been as sealed as could be.

 

The leaks that I had was very small and the fluid evaporated before it reaches the floor.

Drive for a bit, then check the hoses and the plastic expasion tank for any "wet" spots.

There is a small hose that enters the top of the tank - the nipple usually cracks - try moving is up and down a bit - mine came right off.

Note: only do the last bit if you have a replacement tank rady or you are close to the dealer, cause if that nipple is completely broken you can't drive anymore.