Yes if properly maintained stock cooling setup is just fine as is. But OEM electric fan is really lousy and doesn’t move that much air due to old-fashioned blade design and weak motor. The reason I started searching for an alternative, is because my original fan failed. By the way Jaguar also used upgraded more modern 7 blade fan for XJRS and late 6.0l XJS.
But these newer fans are no longer available new and so rare that I couldn’t even find one used.
So I decided to make my own version of it
I’m sure that not only engine cooling system benefit from this upgrade but A/C system will benefit from this upgrade as well. I also upgraded my condenser to more modern parallel flow type from later 4.0l xjs but taht is covered on another thread.