Hi all dont know how to fix this.in the daytime at the mo its quite hit so on goes the aircon.then in the evening its coller but not cold enough for the heater or warm enough for the air con. So upon deiving at 9 pm the window misted up.put on blower and upto windscreen.but this made it worse.the only way i could get it clear was to use the air con.so y when i drive at night does it do this