I have a 2004 Jaguar S-Type (168,000 miles) with a red warning message "Engine Coolant Low". The engine coolant is NOT low and the engine runs at normal temperature however there is a slight hot or burning smell but nothing apparently overheating in the engine. Q. Could this be a bad engine coolant sensor and if so, where is it located? Mu
st I have a dealer replace the sensor?

 

Long-winded discussion here:

https://www.jaguarforums.com/forum/s...sensor-216006/


The sensor is in the coolant reservoir and consists of a magnetic reed switch and a floating magnet. The switch can be replaced if needed. Make sure the magnet is free to move up and down.

 

Depending on the engine, AJ33 or Duratec V6, the temperature sensors are located in different places. On the 4.2 litre V8, the sensor is part of the water outlet, which also contains the thermostat. The V6 uses a head temperature sensor located on one of the heads.

If there is a scent of burning coolant, it should be found and corrected. The cooling system should be pressurised to 1 bar after a cold-soak, preferably overnight. If the pressure drops from 1 bar within ten minutes, the system has a leak.

 

No, you can replace the coolant level sensor yourself if needed. You didn’t mention what engine you have, but this thread has lots of details about removing the reservoir on a 2003+ V6 model:

https://www.jaguarforums.com/forum/s...lacment-52090/


Once you have the reservoir out, you can access the sensor.

You may find the reservoir removal process easier if you disconnect the hoses at the far end and remove them as a unit with the reservoir. That’s how I did it on my ‘02. Even though it’s a different design, the basic process was very similar.

 

Please note that the plastic coolant reservoir's often split and leak. This happens most around the smaller pipe outlets, so take great care when moving it about or disconecting the pipes.

It is a good idea to add the details of your car to your group signature, including a part of the VIN number. This is so we all know what model and year you have as this can make a big differance. See the first line my signature below for an example.

Mellow

 

I believe a separate coolant level sensor/switch is no longer available from Jaguar; however the same part was used in the Land/Range Rovers of the same era and is still available in their parts network,

 

More details in post #15 here, including LR and aftermarket part numbers:

https://www.jaguarforums.com/forum/s...6/#post2052196

 

I found that the coolant bleed screw is also available through landrover....bought 3 of those plastic suckers