Question about Sub-Zero 650 / O Bottom Freezer Refrigerator

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Sub-Zero 550 with Bottom Freezer

We have a 20 yr old Subzero 550. The freezer works well (zero degrees at setting 5) but the refrigerator is not keeping cold (currently 48 degrees on setting 10). No ice build up on lower left of back panel. What do you think is the cause and steps to troubleshoot. Is it time to stop putting money into something 20 yrs old? What is usual life expectancy? Thanks

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Re: Sub-Zero 550 with Bottom Freezer

The life expectancy of these is as long as you want to fix em. I stll work on plenty of them builty before 1980. You may have to pay $900 for a bad compressor, but the fridge replacment cost is around $600, so it's up to you. take the back wall off behind the shelves an look at the coils. If the coils are frosty on only part of the coils (less than 2/3 I would say) Then you have a freon leak. likely from the evaporater (this will need to be cut out and soldered in with aq torch) If you have all frost top to bottom, defrost it, turn down the setting, and check that your door seals well and the door doesnt bounce open when you swing it shut. If there is no frost at all, feel the frame around the door opening. If its warm, take of the upper grille and then the upper sheild on the left side (2 screws). Use a flashlight to shine trough the condenser (thing on the right, looks luike a radiator) if you shine a light throuhgh towards the fan, but cannot see the light come through on the fan side, you need to vacuum off the condenser and try again. If light still does not get through, go to your local auto parts store and buy 2 cans of NON FLAMMABLE brake cleaner. Unplug the unit and hose the condenser down with the stuff untuill you can see light through it from the flashlight. this will be messy, so have a spare rol of paper towels handy. The fumes will be bad too so open a window and put a fan in if you can. If the frame of the fridge is not warm, and there is no frst, discannect the cold controll and use a piece of wire to connect the two wires together after you disconnect them from the cold control. Do not connect the green wire, and be carefull as ther will be 110volts in one of those 2 wires if you didnt unplug the fridge. let the thing run with the control bypassed for 15 minute or so and watch the coils to see if they frost. If they frost all the way, top to bottom, replace the cold control (one for the fridge on the right, by the way)Hope you can get the info you need out of this. Good Luck!

Posted on Sep 07, 2007

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