Replace "hi/low" dimmer switch under plastic cowl, on steering column on 2000 Buick Park Avenue

Has always been difficult to go to "hi" beam (after about 3 to 6 trys). At this point, you can hear that the switch is being activated, but as soon as you let up on the activation lever (on steering column), the head lights return to low beam.

Asked by for the 2000 Buick Park Avenue