I think my evaporator core has sprung a leak. I took my 2002 325i to my mechanic and after charging my unit and adding die he tracked it the leak down to my evaporator core. He said this is very labor intensive (11 hrs) and that the dash needs to come out. He referred me to another company that works on my type of car. They gave a price quote of $1300. Does this sound correct? Also I searched for evaporator cores on my own and found a wide range in price ranging anywhere from $80 to $500. Is there a specific brand I should get? I'm sure there is a difference and will definitely avoid the cheapies.