XL 2003

In VBA I calculate a range (myRange) to apply in an autofilter.

I have used both of the following code and the AutoFilter toggles on to off
each time I run the code. My goal is to have the VBA code remove all
previous settings then apply
AutoFilter to myRange. Therefore I tried to clear settings:

Selection.AutoFilter -or- ActiveSheet.UsedRange.AutoFilter

Later in the same procedure I used:

If myRange.AutoFilter Then myRange.AutoFilter

-or-

myRange.AutoFilter

No matter what my approach, the AutoFilter toggles on to off
each time I run the procedure.

Where is my logic breaking down?

Dennis