2000 S-Type V8. 66-K everything runs great and I get 26MPG on trips 17 MPG in town. Two years ago I replaced the factory water pump with a new model with a metal water wheel rather than plastic. Recently the indicator light has sent a false signal of overheated engine on three occassions for about 20 seconds and then returned to normal. The engine was not over heating. Any ideas? I do not want to go to the Jag dealer for $$$$. HELP!
I’m going to take a wag at your problem and suggest the metal pump impeller is becoming deteriorated from the coolant and is unable to keep up the proper coolant flow.
Plastic ones usually last longer.
The techs who REALLY know will undoubtedly inform you of the correct diagnosis if I’m wrong.