Product review (5 stars): Excellent replacement
This review is for the "Refrigerator Condensor Fan Motor for Sub Zero 4200740" sold by "partshouse".  (That's the way they spelled "Condenser".)

Our Sub-Zero is a model 690.  This fan motor works great for it.

It appears that Sub-Zero uses the same condenser fan motor for many different models, hence the proliferation of parts that come with this replacement motor.  My motor kit included all the pictured items.  It did not include a new fan blade.

Installation was almost a snap.  It was a very quick process to select the correct connector and insert the wires.  Then the only issue was to remove the old fan motor bracket with the fan motor and fan attached, swap the motor, and reinstall.  It sounds simple enough, but that doesn't mean that it's easy.  (Simple and easy are different.  e.g.  "Buy low and sell high" is simple but not easy.)

Getting the rearmost screw removed from the fan mounting bracket was probably the most difficult task, but if you are handy and have a good assortment of tools you should be able to do it.  It should go without saying that you should have the refrigerator turned off while you are working in the mechanical compartment.  I unplugged mine as well.

When all was said and done, I am VERY happy with this replacement motor kit.  I really can't say whether the fan is louder with the new motor or not, mostly because I don't think my original one was working all the time.  Do you suppose those reviewers who complain about the noise are upset because their old fan was off and now they have one that is turning?

We had two symptoms indicating that this fan motor might have been failing, but I didn't recognize that these symptoms indicated the fan.  The first was that the center wall between the refrigerator section and the freezer section on our side-by-side was hot.  Allison Cummins' review from 18 February 2013 mentions that this is an indication that the condenser fan is failing.

The other symptom was that we were getting "Vacuum Condenser" messages way too often, sometimes within days of vacuuming the condenser.  If I had thought about that for a while, I would have realized that if the refrigerant doesn't cool sufficiently as it passes through the condenser, the system assumes that the condenser is dirty and turns on the "Vacuum condenser" message.  This same condition can occur if the condenser fan has failed or is intermittent, even with a clean condenser.

So, if you see a "Vacuum Condenser" message more than you should, and/or if the center wall between the refrigerator and freezer is hot, you should be checking for a failed condenser fan.

A hint: While we waited for this motor to arrive our refrigerator was getting quite warm.  I bought a small $12 "personal fan" at the local hardware store and set it up to blow onto the condenser.  I also left the front cover off the mechanical compartment.  This kept the refrigerator working and we didn't lose any food except for the ice cream, which had already gotten too soft.  In fact, after I installed the little "personal fan" the fridge worked better than it had in months.

One last tip: I took a precaution to ensure that this fan motor never fails again.  I bought another one as a spare.  I'll store it right inside the mechanical compartment above the refrigerator.  The currently installed motor should work forever as long as the fridge knows there's a replacement ready.

This is a great replacement part for a very reasonable price.  I'm sure that had I bought one from an authorized Sub-Zero parts distributor it would have cost three or four times what I paid for this one.  Don't even ask what it would cost to have a service technician come out and change it.

HIGHLY RECOMMENDED!

- Loren