Why don't my power door locks work in the winter time?

The truck is a 03 ford f150 4 doors. The power locks work when it is hot outside but when it's winter the power locks don't work at all. What is a solution for this?

It's a FORD, so 'Fiddle Or Repair, Daily'. IF you wanted reliable, you would have bought Japanese or German.

It sounds like there's too much grease or dirty grease on the mechanism or solenoid. Cold grease is much thicker than warm grease.