Date registered: Nov 2013
Vehicle: MY05 CLK55 AMG , MY05 CLK320,Former,C180 Kompressor,Jensen Healey,Ford Capri V6,Alfa GTV.
Location: Australia's East Coast
Mentioned: 2 Post(s)
Quoted: 298 Post(s)
I don't have my C180K any more,but from what I recall I think your problem may be normal,but I cannot rule out a fault. It is normal to have air coming out the large top vent when you don't really want it to.
I would recommend that when too much air comes out the top vent use the scroll dial on the vent to shut it down,and do the same for the side vents and centre vents.
Obviously put the main setting to feet position,and put the temp up high,like 27 degrees.
If you leave it on auto the AC will run all the time,so I suggest switch it off by pressing the AC button whenever you don't want cooling,this is the economy mode,this will save some fuel as well. Remember,if the little red or orange light is on,then the AC is off. If the AC has been running for a while and you switch it off,it will continue to put out cool air for about another ten minutes.
The other thing of course is that your car engine needs to be up to temp before you will get really hot air coming out. It should take no more than five minutes for your engine temp to get up to normal 85 degrees . If not,you have a thermostat problem.