That's because the o-ring that keeps water out of your lock is still intact. My driver's side lock is the only one that freezes, not the passenger side and I belief the o-ring is broken. Anyone have a pictorial on disassembly of the lock to replace that o-ring?

Took advantage of the 45 F weather today and fixed my keyless entry for good this time, hopefully. http://youtu.be/wSi3JlLVXus I will keep the bra over the lock till winter is over to keep water out, which can't be good for it I'm sure

My solution is I live in California.

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Great burn, and only 5 years late!

I simply put a little dab of waterproof tape over the lock when temps threaten.

It is not worth it to me to live in California.

Frozen Locks
 

Always a problem, even here in Sunny Southern California where I got locked out of my 240D's trunk this afternoon......

The problem is two fold : lack of proper lubrication and the aged O-Ring allowing water in .

Alcohol and WD-40 both disperse the water and at the same time wash away any lubricant allowing fast wear of the delicate pot metal cylinder, guaranteeing more problems in the future .

Using engine anti - freeze is a good idea, I learned to soak parking brake cables in it in the 1960's in New England to prevent them from freezing in the on position .

Here in So. Cal. simply getting the correct graphite lubricant and USING IT is the simple solution ~ I usually lubricate the vehicle and house locks once or twice a year.....

Chrysler's heat riser solvent excels here ~ it even comes with a nifty plastic snorkel glued into the nozzle and it good for freeing up stuck / rusty heat risers too .

I've posted the P/N in the past, some here should have it ~ I'm far from my supplies right now .