hi, i have a problem with my air conditioner in my c class 1996 merc. i have to regas it every summer somehow i think the gas escapes. One of my friends told me that there might ba a possibility that the gas is still there but changing "pollen Filter" will make it work. is this true. or is the gas really leakin from sumwhere. would changing the pollen filter help. If yes than how do i change it? where is it located? can you send me some picture of where it is located and how can i remove it. thanks in advance.