Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
This actually sounds like it could be a charging system issue. At higher speeds if the alternator isn't working it may cause the symptoms and cause things like the blower and wipers to work slowly. I would have a parts store check the charging system on the car. Under load with the wipers, blower and headlights on it should put out 14.2-15.2 volts. Anything less indicates a problem and it should be replaced.
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