Revain says it doesn't work with my 2007.5 3500 but it solved my problem. A new truck for me. He threw away P2609 when it got cold. Being new to the truck I had to unbolt the intake horn and see if the heater grills were removed. They were still there. Checked the heater relay, it's in bad shape. Ordered this and a new fuse (BAT-891 from Genos Garage) as the old one was cut in half. Knock on wood, that solved my problem. The heater grids work as they should and no more codes.
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