Clicking Temp Blend Actuator Removal
 

As luck would have it one of these Explorers with the infamous clicking actuator came in to be repaired. This one had no heat some fail in the full heat position. If yours has no temp control and clicking noises from the dash take a look at my video it may save you a boat load.
Average repair price $300-$500 at a shop.

I hope this helps some this extra cold winter, it is actually a very easy repair.