I have a 2000 S-Type 4.0 liter that my wife and I do a lot of road trips. In 113 F and hotter environments, when climbing grades the car tends to run hot. Does any one have any information about available cooling upgrades? I know they used to race these in Europe so maybe there are still some companies that supply upgrades.

 

How many miles on the car and what is the condition of your cooling system? I live in eastern Montana and in summer months temps can be 105+ degrees F and no "running hot" issues puling grades with my S-type here...

If someone replaced the coolant using mineral rich tap water, you may have calcification of your radiator core.

 

There may not be much available out there. Insufficient cooling rarely seems to be a topic on the forum. And in those cases, it's more like somebody had a fault reducing the system's cooling ability, and not necessarily a design shortcoming requiring an upgrade.