very possibly the hot smell is the emission system ,on our class eight units it is regenerating/cooking the soot in the diesel particulate filter down to allow the exhaust to flow properly.
it smells way different on the newer units and we get a lot of drivers complaining about it.
it causes the temperature in the dpf to sky rocket while it is doing this and it does this mostly when moving down the road if you are lucky, idling and cooler temps seem to make it happen more frequently.
read through your owners manual it should have a section covering this
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