Question about Sub-Zero 632 / S

1 Answer

Refrigerator not cooling top shelf

I have a 10 year old Sub-Zero side by side refrigerator - freezer. About two months ago, the top shelf (top 1/3) of the refrigerator became warm compared with the bottom. The lower shelves remain cool but even when the thermostat is turned to the coldest setting, the top shelf remains relatively warm. There is also some new ice build up in the refrigerator section on the back wall, about at the level of the vegetable drawers. The freezer appears to be working fine.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 175 Answers
Re: refrigerator not cooling top shelf

It sounds as though you have a fridge that is low on freon. If the ice is appearing mostly to the left, then thats surely your problem. if it goes all the way across, you may have a bad evaporater fan motor, fan motor switch, bad cold control, or just a door that isn't closing or sealing properly. If its the ice mostly to the left side, it probably means your evaporater is leaking the freon. I am assuming you have a model that has a cold control on the back wall, not the electronic display by your description. If your unit is less than 12 years old by the installation date, the part will still be under warranty (sub zero has an unmatched 12 year sealed system parts warranty) but the labor and freon will not be. The repalcement of that evaporater in my area usually runs about $450 with labor, freon and trip all together. It is a repair you cannot do unless you have an acetlyn torch and some silver-soldering/ brazing ability. If your model is in fact the newer style with the electronic temp display, call sub zero up (the # is on the model/serial tag in the door jamb) and tell them wahts going on. If it is in fact an evaporater leaking on this style, they will most likely pay the bill for you even if its well out of the 5 year full warranty. If you want to know for sure, remove all the shelves, then remove the cover over the lights. Then if its electronic remove the 3 screws holding the top of the back panel and tilt the panel out to you and pull it up and out: if its a dial type, remove the 2 screws holding the fan cover and then tilt the back wall out to you and lift it up and outwards, but not too far as it wil pull the wires of that control knob (cold Control) Look at the coils back there and see if the coils are frosty. If they are only frosty on the upper left of the coil, its low on freon and needs an evaporater. if its frosty all the way across, top to bottom, you need a cold control, or possibly a fan or fan switch. Hopefuly you can wade through all this. Just post back if you have any questions. Good Luck!

Posted on Aug 16, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

How to replace defrost timer

a bad defrost timer can be checked with a multi meter

Sep 08, 2014 | Whirlpool Refrigerators

1 Answer

Is it normal for warm air to blow out of the fan at the top of a side by side sub zero. Its over 20 years old and we recently had the compressor replaced on the freezer side.

warm air will blow out from the condenser fan which is in the same area as the compressor.
There should be no warm air inside the freezer of fridge.

Jul 22, 2011 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

I have a 20 year old side by side sub zero. For the last few months i have had problems keeping the temp even in the refrigerator side, either freezes or gets too warm. Now it wont get colder than 45 or...

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Hi,

Check out these tips...they can help you figure out whats going wrong with your refrigerator and why it is not cooling

Refrigerator not Cooling or Fridge not Cooling

How to Defrost Refrigerator Defrost Timer Problem

Water Running in refrigerator from Freezer


Sep 09, 2010 | Sub-Zero Refrigerators

1 Answer

Frost accumulating on back of fridge - service light blinking


Apr 23, 2010 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

Freezer does not work

Most model numbers are located in places like the photo shows below. It may be the thermostat itself causing the problem with freezer, yet I don't believe I have seen a refrigerator running without using the freezer to cool the refrigerator section. I guess anythings possible. Let me know, Thanks, Sea Breeze


Apr 21, 2009 | Sub-Zero Bottom Freezer Refrigerator

1 Answer

Top shelf of old sub-zero refigerator 60 degrees, bottom shelf OK

u may have a defrost problem it would be worth paying for the service call if something simple like defrost or a fan would still be more than 200 but worth it

Mar 18, 2009 | Sub-Zero Bottom Freezer Refrigerator

1 Answer

Sub-Zero 532 (About 18 years old)

First do the simple things like cleaning the condensor coils and turning the defrost timer a few times, also check the evaporator motor or just listen to the fan by opening the freezer door. Also check the light switch, make sure it turns the light off every time you close the door.

Jun 26, 2008 | Sub-Zero 632 / S

3 Answers

Sub-Zero 511 Freon Leak

replacing leaking evaporator on Sub Zero R134A

Jun 22, 2008 | Sub-Zero 30.1 cu. ft. Cabinet Depth...

1 Answer

Sub zero 650 fidge holding at 53 degrees

That depends on if your model has a five or ten year warranty on the compressor. Your problem may not be warranty related. Check and see if the condenser is clean, check for a frozen cooling coil.

Jun 02, 2008 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

Older subzero side by side not cooling

At sixteen years old it is almost through its life span. A change in ambient temperatures will change internal system pressures. Make sure the condenser is cleaned well. Use a vacuum cleaner to clean off the condenser, then blow it out with compressed air. Even though a condenser looks clean on its surface fins there may be dust down in between the fins.

May 05, 2008 | Sub-Zero 690 Side by Side Refrigerator

Not finding what you are looking for?
Sub-Zero 632 / S Logo

493 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sub-Zero Refrigerators Experts

Mike Cairns
Mike Cairns

Level 3 Expert

3053 Answers


Level 2 Expert

102 Answers

ACME Sub Zero...
ACME Sub Zero...

Level 2 Expert

39 Answers

Are you a Sub-Zero Refrigerator Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides