I have asked this question in the past. followed advice and still have issue. See Van sliding door frozen shut I recently purchased a 2004 Toyota Sienna. I do not have electric doors. when it is cold I cannot open my doors. I've tried cleaning the seals and I sprayed it with a silicone based lubricant. the other day it would not open so I forced it open. the door fell off the track, I did fix that. I did not see any sign of moisture on the seals after I forced it open. I'm thinking of buying a car port and leaving my windows open a bit, in hopes that moisture would leave the van. is that a good idea? what are some other potential causes and fixes of this problem?