Way back in 1922, Jaguar wasn't the well-known producer of luxury automobiles that it is today. They made motorcycle sidecars back then, but since then they have produced some fantastic vehicles, like the Jaguar XJ third-generation including the X350 and X358 variations produced from 2004 until 2009. Sometimes even Jaguars encounter mechanical issues that require the help of a professional.
One issue that has been reported by Jaguar XJ X350/X358 owners concerns a faultier in the coolant reservoir. Drivers have reported that the low coolant indicator light comes on even as the temperature of the engine remains normal. Upon further inspection it was discovered that the vent hose had somehow removed itself from the coolant reservoir. The reservoir, apparently under more pressure than is normally expected, had popped the hose off and in the process had damaged the hose to the extent that it could not simply be reattached to the reservoir. This is an issue that may be resolved by completely replacing the coolant reservoir.
This incident occurred while the car was in operation. The car should not be driven at this point and may require towing to a repair shop. Whether this is a problem that can be addressed by repair or replacement, it does need to be addressed immediately and the car should not be driven as there is a danger of overheating the engine which could cause even more damage.
If you are experiencing a failure of the coolant reservoir of your Jaguar XJ X350/X358, you should bring it to a trained British import technician for an evaluation and estimate for repair. This is can oftentimes be cheaper than taking it back to the dealership.
Search for a local, independent Jaguar repair shop with Jaguar mechanics that have dealer-level expertise at a fraction of the expense.