 The AC-Heat system is beyond horrible, making it impossible to use, while Ford (and the dealer) does nothing!   Despite being sold as a "new" car (although bounced from one dealer to another), the air is not clean, fresh or pristine - the way AC air on a new car should be.   3,000 miles later, absolutely no improvement!   The air smells thick and rubbery, like stale hotel air, or bad car vent air, that is hard to breathe in, and seals up my sinuses.   It is simply unhealthful.   Ford's reaction: too bad, sucker!   Adding insult to injury, the "Sync" system that is used to adjust coldness/hotness, intensity of air blow, etc., is a total failure,, in that it requires constant work - even when it is responsive to the touch, which is not always the case - and constant setting change.   There's never a comfortable temperature, in that you just can't make the air a little colder, or a little warmer, as there's no traditional incremental adjustment.   Instead, your only option - and this is on their advanced Sync system - is to adjust the AC or Heat by a temperature number, or a corresponding arrow keyed to temperature, like 65, 68, 71 etc.   But the temperature immediately sets off a computer that often puts both heat and AC on simultaneously, one fighting the other.   The net result is that the heat becomes way too hot, and if you try to lower it to comfort level, the AC will kick in.   Either option yields the thick, rubbery, unhealthful air -- making the AC/Heat system unusable for any prolonged period.    WARNING:  Imagine buying a new car, and having to drive with the window down for fresh air, either in sub-freezing temperatures, or summertime heat.  That's the best description of the miserable experience you'll encounter with a "new" 2017 Ford Fusion--lemons that many Ford dealers are still trying to get rid of, along with their 2018 inventory (I just bought mine at the end of the year, but wish I hadn't).     On top of all this, the gear shift on the transmission spikes and jolts when descending up typical grades on a highway, and the seats are incredibly uncomfortable - particularly when your skin hits the rough middle part that is made of a hard, chafing material.   The passenger seat was so cheaply made that a protruding object, or hard patch, literally juts up from the inside of the cushioning.   I have totally thrown away my money on this car, and tried to get the dealer to take the car back the immediate week following purchase, but was told to call Ford's "Customer Relationship" line if I wasn't satisfied, which proved fruitless.    I believe the first dealer that had the car (and remained title holder when I bought it) was fully aware of the defects, but failed to document them -- all of which are inherent to the car's cheap, poor manufacture and design flaws.    I've repeatedly asked Ford for a buy back, after taking the car out of operation after only 3,000 miles.   To date, Ford has ignored my requests, and told me to go back to the same dealers who wanted to dump the car -- leaving me in an impossible position.    Bottom Line: Don't buy a new Ford Fusion or other Ford product car with the current AC/Heat/Sync Control system, or prepare to encounter unhealthful air, impossible temperature set controls, and a company with zero regard for customer care or satisfaction.     [contact info removed]