IThat's a bad sign. The water pump is leaking and he should NOT DRIVE THE CAR. It will cause damage. Get it serviced immediately.
I'm going to have my 09 MKX changed at around ~150—175k for preventive maintenance. At that time, will also have everything else that fails replaced as well, ie, timing chain and guides, cam phasers (not a common failure on naturally aspirated 350's, but why chance it), spark plugs, coil boots, PVC, etc.
On the fence over also changing the injectors and coils.
Motorcraft parts only, of course.