I have a 94 caprice that does this. Apparently it is either that speed only on the wiper motor that has a problem or the relay for the high speed may have failed and the motor may be ok. As it is a noncritical issue I haven't worried too much about it. If I find out more I will update this.
I use to put cardboard on the glass under the wipers, leaving the wipers laying on the cardboard to hold it in place. Unless it is raining, the cardboard does not get soggy, and does not freeze to the windshield and the wipers do not freeze to the cardboard. I lived in PA for 38 years so I have dealt with ice and snow. Then I wised up and moved here to Arizona. 70 degrees today..................sorry to tell you! You could also put a sheet of plastic between the wipers and windshield. You have to start with a dry windshield and wipers so the plastic or cardboard does not freeze to either.
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