My 98 GMC 3500's doors won't open when it's really cold outside. It's not because they're frozen shut. It acts like the doors are still locked when you try to lift the door handles. Both doors do it. When you finally get the door open and get into the truck, you can't get the door open again using the inside door handle, you have to use the outside door handle. Once it warms up outside or you have the heat cranked up for a while, the doors work fine. Anyone else have this problem? I'm guessing it's a common problem with this model truck since both doors are doing it. I'm hoping to get a heads up from somebody before I pop the door panels off.