Impressed that this is an Accessory

I must say I am very impressed of this porduct as a car accessory.  For older cars which most today do not have a heater, defroster, or cooling system that is functional.  This accessory gives you a way to make it an option.  This gadget also actually has a cooling option that does blow out cool air to you.  The reason it was given 2 stars is that my product was not fully functional.  When I plugged it up, it began to smoke.  So I immediate unplugged it and shook it and some black pieces fell out that looked like teeth or something.  I plugged it back up, it was very loud but seemed to be functional.  I got to at least test it but I would not use it as it should.  So for those reasons it was given 2 stars but the little function I tested out of it broken, it gave out great heat and very cool air.  I would have loved to have one for the older car we are working on as a project.