Hi, i recently purchased an XTRONS sat nav unit for my BMW 118i m sport (e81) which I had fitted, poorly i might add, which has resulted in the air con constantly blowing hot air from the front window vent and side window vents. No matter what i change the temperature to, it's constantly hot (my air con worked perfectly fine prior to this new sat nav unit being poorly fitted). Can anyone help as its making me love my car a little less each time i drive on a hot day - many thanks