[Jdub]

I had always thought it was road grease, dirty blades, or RainX that caused my wipers to grab and chatter.

I can now report that it is heat. It never happens until I push all heat to my windshield. The wipers grab at the lowest point where the heat is concentrated.

I keep a very clean windshield that is new BTW. With RainX, without, the heat was the constant. And this from a person in the rainly NW who always wipes down his wiper blades (once a week when needed) with alcohol to pull off the grunge.

John whose opinions are humble yet esteemed.