Chemical smell inside after sitting closed

[UnsungZero_OldTimeAdMan]

my spare compartment REEKS.

Mildew. Same to OP. Could be mold caused by condensation in the HVAC system.

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[my-pet-snake-reggie]

I noticed a smell for the first time today. Truck is 3 months old and this was the first time. It was a chemical, plastic, fluid smell. My wife said petroleum. No leaks or drips that I could see underneath. I was running stability in low the day before and was thinking it had something to do with having both motors engaged? Not sure if I should be concerned or not.