| ID | Status | Date | Year | Make | Model | Transmission Type | A/C Controls | Public/Private |
|---|---|---|---|---|---|---|---|---|
| #14656 | Closed | 2005 | Chevy | Silverado 1500 | public |
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Did a dumb thing, took brand new Blend Door Actuator and opened it up. The little gear fell out that controls its position and before I realized what I did I moved the timing. Thanks Ray |
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Does the little blue gear have contact fingers on the underside? |
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Does the little blue gear have contact fingers on the underside? No, it slips into a potentiometer and the movement of the gears would tell the system where it is. Would work similar to the volume control for your radio, turn the knob and it gets louder, turn it the other way and the volume gets lower. Hope that explains it. Thanks Ray |
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If it would have had contacts underneath it it would be easier to center everything. Sitting on a potentiometer makes it different. Are the gear and the potentiometer indexed // notched in any way? I would suspect that the potentiometer did not move when the gear came off and you could just slide it back on. To test the actuator I would probably remove the pink gear. Then connect the actuator and monitor the position sensor as the large white gear is turned by hand. Set it to have an equal voltage above 0 as it has below 5 when set between the two respective hash marks on the outer housing. |
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Thanks for the info, not exactly sure what you mean by ‘equal voltage above 0 as it has below 5’ and where do I measure it from. Attaching another picture showing little blue gear, which has a ‘hole’ in it, then 90 degrees clockwise has a ‘1’, then 90 degrees clockwise a ‘circle’ then 90 degrees clockwise has what looks like a raised ‘dot’. This keys into ‘POT 1’ on the circuit board. I would think you would install the large white gear pointing in a certain direction and then drop the little blue gear aligned to one of the marks on it. The POT1 on the circuit board doesn’t have any stops on it. You can spin and spin it. Hope this makes it clearer. Thanks Ray |
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The actuator shaft has a slot in it and there are two hash marks on the black case in roughly a 90 degree arc. The feedback voltage should be near 0 at one end of travel and 5 at the other. The hash marks are the end of travel positions for this discussion. I have never measured it but logic would suggest the the centered position would be 2.5 volts. If the feed back voltage is at .75 volts at the lower end then you would be looking for 4.25 at the higher end. The voltage would be measured on the light or dark blue wire at position number 9 of the actuator harness connector. I don’t know if you are replacing the driver’s side(light blue) actuator or the passenger side (dark blue). It is best to have the actuator mounted while testing so that it does not over travel and cause internal damage. Another way to do this would be to get your hands on another new actuator and carefully remove the cover without dislodging the gear to check it’s assembled position. Take note of where the shaft slot is in relation to the hash marks.
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Thanks for the help. I used resistance to set the POT1 to the ‘middle’. 10k pot so its 5k between pins 1 and 2 and 5k between 2 and 3. When I placed the blue gear on POT1 in ended up pointing the ‘1’ on the blue gear straight up on the pot.. Then I placed the white gear in the center of movement, |
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Glad to hear you fixed it. |
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thanks |