Mini Split Condenser in Garage? With ventilation?
According to this webpage, "the answer is an emphatic NO."  The page goes on to say this is because the total volume of air in an enclosed space is insufficient, including a garage with an open door as the air isn't likely to circulate enough.

From this we can deduce:


There is nothing in most codes preventing you from doing it.
If you are planning to do this, you'll need to pay very close
attention to where your intake and exhaust air are coming from.
If you don't design your ventilation perfectly, your system may not
be able to cool your space