my 1999 S70 T5 has a problem wih the AC. it blows nice and cold..but it seems like when I adjust the temp...it usually happens when i make it WARMER...or if I turn the AC off...i get this stale smell coming into the car.<p>it's not there all the time.<p>the dealer suggested i change the cabin filter. but i don't know if that iwllh help..the smell isnt' there all the time...<p>it's a stale smell...my wife thinks it's a chemical smell....hard to descibe..it's not dusty smelling....i dont' know what it is.<p>anyone else expeience this or have any guesses? when i make the thermostat go warmer, or turn off the AC, i wonder if some vent is adjusting, and i'm getting air routed inside the cabin from some part of the AC that may have something trapped in it? <p>maybe some way to flush the systme out? or clean the vent system?