Check the thermal relay for the cooling fans.
If the cooling fans do not activate in a 1997 XK8 Jaguar, first check the fuse associated with the cooling fan circuit to ensure it hasn't blown. Next, inspect the coolant temperature sensor and wiring, as a malfunctioning sensor may prevent the fans from turning on. Additionally, verify the operation of the fan relay by testing it or swapping it with a similar one. Lastly, check for any overheating issues or coolant levels, as the fans should engage when needed for engine cooling.
Check the temperature sensor
The cooling fans turn on utilizing a temperature sensor and a relay. When the engine gets to a certain temperature the temp sensor closes and the cooling fans come on. Check fuses first. If you have a 12 volt test light, hook up the test light to the connector that goes to the cooling fans once the engine is warmed up and see if the light comes on. If it doesn't, the problem is in the power to the fans, check fuse, sensor and relay. If the light comes on and the fans don't, check for a proper ground (usually a green or black wire attached to a lug and bolted to the car chassis.
have the cooling fans checked out.
Check the relay.
Drain antifreeze, remove upper and lower rad hoses remove both cooling fans, and both bolts that hold condesnor to rad and pull rad upward out
When the cooling fans do not work in a 1997 Jaguar XK8, check the fuse related to the cooling system, as a blown fuse may prevent the fans from operating. Inspect the wiring and connectors for any signs of damage or corrosion. Additionally, verify the operation of the coolant temperature sensor, as it signals the fans to activate. If these components are functioning properly, the issue may lie with the fan motors themselves or the engine control unit (ECU).
The cooling fans are the only cooling source for a air cooled engine.
Check to see if they are getting power Could be a bad temperature sensor Check to see if they come on with A/C or defroster
In all probability it is the cooling fan switch. Before you replace it you need to check the fuses. The cooling fan switch is on the intake manifold.
check the smog pump ,,,i had the same problem on my 95 z28