low coolant light comes on

Yes there is such a thing as an electric water pump but the Jaguar has several problems if your engine is a V8. The plastic black hoses at coolant expansion tank break easily and fail, the water pump impeller is plastic and fails resulting in coolant not being circulated. V8 or 6 cylinder in line engine first thing to do is have a "block test" done it looks for the presence of carbon monoxide in the cooling system to determine if the head gasket is blown ,The test is quick and simple (in expensive).