I spliced a small (don't remember the wattage) block heater into a heater hose on my gasburner '11 Ram while in NW North Dakota. At 30 and 40 below I had hot air when I'd start it at 4:30 every, morning. My last winter I'd gotten a '14 Ram with Cummins, plugged the block heater in every night and while it'd crank instantly on the coldest morning, it didn't have the instant cabin heat I'd enjoyed the previous years.
RonR
