What is the difference from a FL-1A and FL-820S. I was changing my oil and filter and noticed i had a small radiator in front of the main one and a really small radiator behind the main radiator. 3?. I have a 2002 Explorer Sport Premium.

The small one in front of your radiator is for your Transmission, and the even smaller one is for your Power Steering system.


Hope this hepls.