my turn signals don't work when the car is cold. They slowly begin to work and work normally as the car warms up. Does something need cleaned or replaced? TIA

 

Yes there is a 'conductive' grease inside the turn signal switch, when it is cold and stiff, it lifts the spring loadedcontactor slide up a little as it goes over the contact bar, the only answer is to remove the switch and carefully take it apart, then wipe out the excess grease.
Or warm up the car till all the windows are cleared off before you drive.