Purchased 2005 XC90 T6 AWD a year ago, low cost, with a blown engine. Original owner purchased it from Volvo Sacramento, Ca. Traded it in to a Volvo Dealer in 2015 in Florida, 129000 miles on it. Dealer in Sacramento, (original selling dealer bought it). Then sold it via auction, don't know why, Nov...

Moisture, condensation must be desert dried. Air movement dries faster that just heat. Windows down, doors open blower in cabin for some time to blow moisture out. I would unplug electronics and put "Electrical Silicone sealer for all electrical connections" in all electrical connections, ...