Trouttrooper

I double checked my owners manual again and all it says it that the heater will only work below 0F, and that above 32F you don't need to use a heater. They fail to explain what should happen BETWEEN 0 and 32. There's no explanation in the book about setting off a DTC P0166. The way that thing is described, sounds like they also put in a wimpy heater compared to previous years. Whoever designed this must not know what snow is. Anyway, thanks for giving us this info. Makes me feel better now that I can replace the tumor plug with a normal one and not seriously damage anything.

I too went to the dealership a couple days ago asking why they put the weird plug on to keep it from working until below 0. There were 3 mechanics that happened to be behind the counter and all of them looked at me like I was stupid, none of them knew what I was talking about. One guy finally said it was because "something" could burn up if it got too hot, but he couldn't tell me what or why "0" was such a magic number. The other response as I was walking out the door was my truck would start above 0 and didn't need the block heater.