** can I disconnect the freezer only? **
As thiggy said, no.
** It just builds up with ice all the time **
It should accumulate white, snow-like “frost” (not clear “ice”) and periodically need to be defrosted. DON’T use a sharp object!!!!
If it is “frosting” up too often, the door seals may be leaking and need to be replaced. If it is “icing” up, you may have some other sort of problem.
BTW. The frosting should be uniform across the evaporator’s (freezer box’s) whole surface. If it is just building up in spots, that is something else again.
JFYI
Dan O.
http://www.Appliance411.com/?ref411=Fridge
The Appliance Information Site
=D~~~~~~