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I also have been having this problem. The driver front door will not always fulling lock with the electric locks. The driver back door will get froze locked, I have to roll the window down and pull it up with a pliers.
Most of the time this is the worst right after I wash it, or if the weather is a little warmer were there is a lot of melting, then gets cold and freezes.
I also thought the same thing, some kind of lubricant. Graphite is good through the key hole. I think in my situation I will have to pull the door panels and get something on the parts that are freezing. Something that will not gum up too much when cold, but will displace water/moisture, so it doesn't collect and freeze. I'm sure it doesn't take much.
Graphite in the cylinders does make a huge difference, but in my case it does not fix my problem in extreme cases.
I always thought lock deicer was a bad idea, to only use it when you have to. I thought it gummed up the lock mechanism over time with use.
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