Burning smell
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5th Wheeling
Joined: Jan 2016
Posts: 34
Likes: 0
Burning smell
I’ve got a 2018 3.5 4x4 screw. A few days ago I noticed that when I start my truck, there’s a slight burning plasticy smell coming from the HVAC. It doesn’t last long, but it worries me. I turned the truck on this morning and opened the hood to smell around. Nothing on the driver side, front, or around the battery. The smell seems to be radiating from the fuse box. I took the cover off the fuse box, and nothing feels hot but the smell did get stronger. I’m gonna try and look it over with an infrared thermometer later this afternoon if I can find one.
Logistics Pro
Joined: Jun 2017
Posts: 3,948
Likes: 509
From: Edmond, OK
Let us know what you find with the IR thermometer. If there are no hot spots you can try removing fuses one at a time and see if the smell comes back. I'd remove a fuse, let the truck sit a few hours, and then start it and see if you sense the burning smell. Good luck. 
Fleet Mechanic
Joined: Nov 2016
Posts: 1,634
Likes: 72
Could the smell be mold/mildew?
What if you start the truck with the HVAC turned off? Do you still get the smell?
I can't conceive of a way for burning/melting plastic in the fuse panel to get into the HVAC vent unless it got sucked up the intake while in recirculate mode.
What if you start the truck with the HVAC turned off? Do you still get the smell?
I can't conceive of a way for burning/melting plastic in the fuse panel to get into the HVAC vent unless it got sucked up the intake while in recirculate mode.
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