Hey Barry; does your fridge have a water dispenser on it? Some have one inside the fridge compartment in the roof of that area; whereas most would be through the door. If it has one, see if you can purge out all the discolored water through this dispenser.

The icemaker is a simple device. The ice cubes freeze in a tray you can see with a mirror looking in the freezer. That's usually coated with a non-stick coating of some sort. I doubt this is where the green is coming from.

Working back from the ice cube tray towards the water well, the next thing back in a plastic tube through the back of the freezer, down the back of the fridge, and to a plastic solenoid valve under the unit.  I doubt any of this could make a green color; much less a bad odor.

Next would be a filter element. This is a highly probable source of the problem. If the filter element has been neglected for years, and has deteriorated, it can generate an odor. See if your fridge has a water filter; not all of them do. 

Next on the way back towards the water source would be the interconnect tubing from the fridge to the water pipe. This often goes under the cabinets and ends up under the kitchen sink, tied into the cold water supply to the faucet.

Here is where I expect the problem may lie. If they use copper tubing for this connection, you have probably found your culprit. Copper corrosion byproducts are often green in color. They also have a strong metallic taste.

If you find a copper line between the fridge and water source, then I would replace that with poly tubing and poly fittings. These never corrode, are more flexible and less likely to crack and leak.

Hope this helps!

Sincerely,

David

Hi Barry. If they used a metal tube it will be copper. If it's going down to a basement water hookup and is several yards long, it's probably at fault. You might just want to leave the ice maker on and keep tossing out the ice until it's clean. It's a shame to abandon the ice maker, in my opinion. I guess in my case I just like having ice too much! LOL!

If you dont't already try the refrigerator baking soda boxes, one in fridge and one in freezer, may help prevent food smell transferring to the ice.