Back in my Proton Sage and Wira days, I used to turn on the air cond at it's lowest temp. When in normal traffic, it's no issue. But when running on highways or roads that aren't congested, your air cond will run colder than it should because your engine and belts are also running faster.

I recall I had air cond issue one day and I found that it wasn't cold not too long after I restarted the car after stopping. When I open the hood, a hose had ice wrapped around it. I was soon advised by a trusted foreman that when running the car at constant speed, the temp need not be at the coldest. This will freeze the hoses if prolong. Then when you restart, mist will appear and little air will come through because the inlet has reduced due to ice inside. When that happened to my car, I poured water on the ice to melt it and it was fine after that. Since then, never have I turned it to the coldest.

Cars these days could be smarter and more advanced compared to then. TS, what car is this?

When it's "Normal", compressor kicks in as usual, and the cooling coil will freeze, creates ice for the fan to blow cold air, when it reaches a certain freezing temperature, the compressor cuts off to prevent further freezing (depending on the temperature u set at the panel), thus when ice melts, mist as u call it, blows out (most of the time if u kasi max fan). then when ice melts and temperature rise, compressor kicks in and cooling coil starting forming ice again and cold air out.

get the concept?

usually old car will have this problem, newer car tarak.