I think I just experienced the same issue as your post this morning. I have a 2016 Challenger kt and after a very heavy rain last night I went to the coach and the furnace blower was running and I was unable to shut it down. The thermostat was on Off position as well, when I put it on Heat it would click on and off. I opened the panel to the Furnace outside and there was a lot of water sitting in the area where the exhaust comes out. I think that the angle of the rain and wind forced water in. My louvers are inverted so I can see how the water came in. I will try to dry it out and see what happens.
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