my mechanic was a chevy dealer mechanic for a few years. also he drives a lumina for many years and has done the switch several times on various GM cars.so i have full confidence in him. plus he,s always been honest with me. it could be the switch itself if the lever connects to a spring inside the column. in the past i remember some kind of spring action when you put the wipers on high speed. now it feels blank, no resistance trying to put the wipers on high speed. problem again = no intermittent and no regular speed wipers.