Fumes in cab while towing

[Ram_Rocks]

This past week was my first trip with my new ram standard output, hurricane engine. After an hour into the trip, we’ve noticed fumes entering the cab while the air conditioning was on recirculation. We do have a few oil fields here in Michigan, so we just assumed it was the burning of those fields because that was a similar smell. Upon further towing to and from our destination, we’ve noticed that there was a correlation with working the engine harder, pushing it to near 3000 RPM while towing up hills and then letting up the gas, the cab would then fill with this fume smell that was very nauseating.
Not 100% positive that it is in relation to the air conditioner or not because we did smell it coming from the vents when it was not on. Just wondering if there’s anybody who experienced similar events while towing heavy loads.
I’ve looked under the truck periodically afterwards, and there is no leaks on the floor of my garage.

 

[Richard320]

Is this the first time you've worked it that hard? Could be paint and preservatives burning off

 

[Ram_Rocks]

Is this the first time you've worked it that hard? Could be paint and preservatives burning off

Yes first time. Good point. I have an appointment Wednesday to see if they can find out. What paint would be burning off? I also have 4300 miles.

 

[Ram_Rocks]

Update: took my truck in for service to have them look at the smell and of course they couldn’t replicate what I was smelling, but they did notice that a few of the exhaust clamps were loose so they re-clamp them. Just towed this week and did not smell the exhaust smell so it must’ve been the clamps. Also was getting a slight noise which I thought was a front end but they determined and it was the rear end and replaced the rear differential fluid and added some anti-slip fluid with that. Hoping that resolved the issues. 4000 miles.