i have a 1998 xjr and i have been losing very small amounts of coolant nothing detectable by eye. However since I have owned the vehicle it makes these popping and clicking noises after driving even small amounts of distances. Temp never rises above 200 and I have replaced water pump and inter-cooler pumps as a precaution. Still seems to run hot to me are these noises normal for a Jaguar?

 

I think you need the forum below, the one you're in is for the 2003-09 XJ8

https://www.jaguarforums.com/forum/xj-xj8-xjr-x308-27/