I've never seen this

[Yarochrehc]

Hi,
That is a mullion heater, It did come on some models and it does what Jim said.  The cable has a resistive wire inside and depending on the ohmage value this would create a certain wattage of heat per foot of cable. Some times the cable has a metal braid around it to protect it from wear and shorting out.

It was used to keep the door from freezing shut or keep the glass in the door from fogging up.

House hold refrigerators have the same thing around the freezer door and is also widely used on commercial cooler doors.

[Pat Pixley]

Ok I'm going to go along with everyone on this,
 so I will hook it up  when I'm done.
 Thanks every one for the help on this.
  
  Thanks
    Pat   '>

[collecture]

I concede...it makes more sense. I stand corrected...good knowledge to know as always.