What is a coolant filter?

[Chrispy294ss]

My maintenance reminder on myfordmobil popped up for the 32k service reminder.
Other than the tire rotation and checks it states coolant and coolant filter change? The last time I checked my owners manual the coolant change was to be at 150k .
Have others seen this?

 

[hybridbear]

I also noticed this recently: http://www.myfocuselectric.com/forum/viewtopic.php?f=14&t=2256&start=10#p22272