It's not the cabin air filter that causes the leaking - it's the gasket for the filter's housing. Ford will probably charge you triple to fix it. For me it was a quickie job with some $2.99 replacement material from Home Depot. It's like 50 degrees out today and sunny; considering the time involved (<1/2 hour) it's worthwhile to get done it out of the way today. Your car (and its interior) will thank you.
