I i have 98 v70 a/c is clod but when their is temp change their is a mist that comes out of the vent but it does not feel wet and thier is a stickey smell too. T recently changed the in cabin temp sensot be cause their a code too. I thought the sensoer will do the problem what do you think it is

 

I have a 98 V70 T5, when mine started blowing 'clouds' into the cabin, the cause was a leaking heater core. The heater core and A/C exchanger are in the same area, and with the A/C on, it will make clouds. Hope this helps.
Regards,