I would wager a small bet that the "plugs" are shot. hopefuly they will come out easy. Good luck. I know my truck starts after just a couple seconds of cranking here in Ut. And everybody knows we get a little snow here! It was down in the teens the other day when i was home, and it strated right up, with only one glow plug cycle. Your temps shouldn't be to tough for it. By the way, i have never plugged my sd in, my pete is always using the chord! (Gotta have my priorities)