thanks I just got it the moment you wrote that ^^
yes I do have two cooling units. I'm cleaning them with isopropyl. Cannot test that right now but will do later at home. But both seem not to have leaks as far as I did never notice sth.
The chamber looks way like this one. little burned in though but not that much
Clean vape is a happy vape.
I think the popcorn taste may br one of two things.
Maybe you have used very fine grind or maybe oils and some of that has gone done below the chamber, only to be reheated over and over again. In my opinion this would requiore a factory service to get clean in there. It would void warranty if you were to open the case to do this yourself.
The other possibility is that dirty chamber!
Two methods to get it clean(er); both take some time and a little heat.
First turn unit on and let it warm to about 80-90 degrees C, with c/u off. Turn off.
Take a section of paper towel, fold and roll into a cylinder, a plug that will fit snugly into the chamber, then moisten with iso alcohol, the more pure, the better. Not a dripping mess, but fully moist. Put the plug in the oven and leave it there. It's universally suggested that this kind of thing be done with Mighty upside down, so no alcohol can drip into the unit. You can turn Mighty on again while plug is in, just to warm, not hot. You can turn the plug 'round to swab the chamber.
Give it 5-10 minutes, but before it's dry, take the plug it out. It will have absorbed a lot of resin. You can refold, reuse or start with an new piece; repeat until clean.
Another choice is to use a Magic Eraser, with either water or alcohol ( I think the alcohol is quicker). Find a type that doesn't have any detergents, etc. I've used Mr. Clean Extra Strength (or some such name, idr). Again, a warm oven is your friend in cleaning process. I use a small piece, put it in there and then use the butt end of the cleaning brush to push the eraser around the perimeter of bowl. This will make it shine like new, but takes time and a little patience.
Down and dirty method would be to use an abrasive cleaning pad, but this will leave the bowl with a coarse finish (scratched) that's later harder to clean, and may possibly leave some aluminum dust behind!