For some strange reason yesterday my intermittent wipers started to work. I've had the car for 2 years now and the intermittent setting has never worked, the wipers wouldn't move. Yesterday at the Intermittent setting, the wipers moved at the steady slow speed. Then about 2 minutes later they started to delay. Strange that they would just start to work correctly. Any ideas why?

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1983 300D Turbo, 150K