The thermostat may stick partially closed resulting in an engine to overheating condition. Replacement of the stuck thermostat should correct this problem.Google+
Car Problem Reports
Jaguar XK8 Overheated Engine Due to Stuck Thermostat
Jaguar XK8 Problem
Average Mileage: 64,000 mi (41,000 mi - 87,000 mi)
Visitor, 1998 Jaguar XK8
Mine was stuck open and I got a low engine temperature lite that causes the engine to go into low performance mode
Visitor, 2001 Jaguar XK8, 41,000 mi
I noticed that my temp guage was heading into the red zone going up a steep hill. I was able to get the car to a Mc Donalds and had it towed to my Jag dealer. The problem was a stuck, partialley closed, theromstat which they replaced. I also had them replace the water pump with the new metal style. I am now seeing the ABS error light come on intermittently. Not sure what to do about that. The dealer checked the car and cleaned the ABS sensor plug contacts on the right rear wheel, which seemed to cure the problem for a few months,but the problem is back.
Stuck thermostat causing fluctuating high water temps and High speed cooling Fan Operation.