It is either loose or corroded at the terminals inside causing the current to heat them up and in turn causing the plastic insulation to get hot and melt.
The scientific name for ice forming is "freezing" or "solidification." The scientific name for ice melting is "melting" or "fusion."
The purpose of a cold heat soldering iron is to fuse electronic components, pipes and other metal materials together by melting solder as a connector which hardens as it cools. You can learn how a cold heat soldering iron works and it's different purpose at the HowStuffWorks website.
Heat.
heat it
Melting
Becoming liquefied by heat
Your body heat.
Take hold of the turn signal light connector. Push the connector in and turn at the same time. The connector and light will come free. Do the same with the light bulb to remove it.
Heat!
Heat from the sun.
don't heat it
heat