My turn signals also don't work below 40 degrees and if they do come on, it is a very long 10-15 second delay, not ideal in heavy traffic that is for sure when you need them to come on instantly.
I tried spraying contact cleaner thru the openings by the turn signal and doesn't help. To do it right as others have said, going to have to take the housing apart and clean it up, etc. OR, just don't drive cycle below 40 degrees outside - that would solve the problem as well?
