Was driving my 2015 Nissan Leaf (50k miles, 10/12 battery bars) today and got a pretty intense smell very similar to natural gas/propane in the cockpit. I turned off the defrost and it seemed to dissipate a bit, but so strange. No warning lights, and it was heating fine. I looked through the forums and couldn't find anyone who has had same problem. Could it be the heat pump going out? There was a lot of snow/slush on road and on hood of car. Maybe air intake blocked? I'm at a loss.