what is the fuse called for the defrost function

What is your question?

the problem started after a car accident. We have put in fuses which fixes the problem for a few hours, enough time to switch from vent to defrost, usually. very weird.

What makes this problem better or worse?

only defrost will work or only vents will work

How long has your 2000 Dodge Intrepid had this problem?

2 years