Mine, a '99 has the high/low beam on the same turn signal switch stalk. My high beam wouldn't work all the time and low beam would go out without warning and sometimes would start to flicker. Eventually, my turn signals wouldn't work half the time.
I though this switch was the culprit. Ordered it and waited for it to arrive, it never arrived and when I contacted Advance-auto they said they never had it in the first place and admitted should have told me so before placing an order. Next I called the dealer and the guy told me the price is around $90 and they have it in stock... went after work to pick up, only to be told they didn't really have it and can order it the following day. I placed the order and went home from there... I decided to take the switch out and take it apart. It had several small pieces inside (all looked brand new) and a quick look at them I found that when they greased the parts upon manufacturing it, they went overboard and there was grease on many copper parts that got hardened and did not provide proper contact. I cleaned them with electrical contact solvent and tooth brush and put them back together and that solved everything... now it's as good as new and I didn't have to spend $90 for nothing.
I hope this information helps someone with similar problems.
Eddie