AC Chemical smell ??

Every now and then, maybe every 10 minutes, my AC put out a puff of air with a strong chemical smell. My first thought was refrigerant leak, but after four months the AC is still blowing cold?

It’s not a mildew smell or soured water smell. It’s more like when you’re dispensing the last bit of a can of shaving cream and you get hit with that butane smell.

I wonder if I’m being poisoned in some way? The fumes don’t make me cough, but my lungs ache for a couple of hours after?

Sorry, this is a Colorado crewcab 3.5l auto, 2wd