2008 Ford Escape heat/air fan only works on level 4, does not blow on level 1, 2 or 3. How to fix?

2008 Ford Escape heat/air fan only works on level 4, does not blow on level 1, 2 or 3. How to fix? - 1

Read more: 2008 Ford Escape heat/air fan only works on level 4, does not blow on level 1, 2 or 3. How to fix?