Alright well this is the first winter for my minivan. I noticed it has the plug with the male end for it hanging in the very front, so I'm assuming its a block heater. I tried tracing the wires but they end up going into a harness and then I loose them. I don't really know if this was a factory option but it sure looks factory to me. Anyway it is starting to get REALLY COLD here and if it is a block heater then starting my van and having it be nice and warm right away would be great. I dunno really how these things work but what I had planned is running an extension cord out to it and leaving it plugged in overnight so when I go and start it in the morning when I go to work it will be nice and warm. Will I be able to do this or will that be bad leaving it plugged in so long? Any tips and info would be a huge help guys. Thanks in advance.