There are many ways that it can overheat. Coolant loss, blown head gasket, stuck thermostat, clogged radiator ar only a few. You would have to consult a mechanic to know for sure why it is overheating.
start with checking thermostat
Check coolant level, and radiator fan operation.
It's the current flowing in a wire that causes it to overheat.
I have found the common causes for this are, a plugged heater core, and a poorly working water pump. The radiator could also be plugged.
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A 1999 Jaguar may overheat due to several reasons, including low coolant levels, a malfunctioning thermostat, a faulty water pump, or a clogged radiator. Additionally, issues with the cooling fan or leaks in the cooling system can contribute to overheating. Regular maintenance and checks of the cooling system components are essential to prevent overheating. If the problem persists, it's advisable to consult a mechanic for a thorough diagnosis.