Join Date: Jan 2018
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I ordered a rebuild kit. Also, I contacted BlendDoor, and this is the reply:
I see that you ordered a GM kit for the Impala – I have about 200-300 gears in service at this point and have had one reported failure, however we believe it was due to a jammed blend door. Aftermarket gearboxes are generally made from Chinese POM and ours are made from genuine Dupont Delrin 100P and are molded in California. Our ford kit has well over 1000 in service without a single failure.
There was testing done in our shop essentially stalling a rebuilt actuator with power applied in both directions to look for gross failure, but we did not do lifecycle testing over thousands of cycles and years. The material was carefully selected, however – with gears a high yield strain is just as important as a yield stress number; it allows for one tooth to bend and share load to an adjacent tooth under periods of heavy tooth stress. Delrin 100P has a 25% elongation at yield, whereas standard POM has anywhere from 7.2-13% elongation at yield, and the yield stress is much higher as well.
As a side note, I believe that lack of lubrication on the shafts and other moving parts of the blend doors themselves can be a major contributor to failure of OEM and aftermarket actuators. If you have any concerns or issues with your kit, please do not hesitate to contact me. We’re a micro business, and we value our “old school” approach to customer service.
The kit is sold on Ebay (Ebay link provided above by jtrosky), and on Amazon and at Blenddoor.com.