Technical heater actuators. how do they work?

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Technical heater actuators. how do they work?

niquest

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does anyone know how the heater actuators work? are they similar to the switches that would be on the window system where any resistance and the motor stops? ive taken 2 heater actuator (motors) of, and the small piece of plastic that's on both that turns the outside cogs has snapped of flush with the side of the motor leaving a bit in the motor casing. was wanting to know if these actually stop the motor when it turns to its final position. one of the motors runs constantly until this small piece of plastic catches as it spins round. so I don't know if ive got a faulty actuator motor, turning and then braking this plastic or it stops with this pressure from the plastic and this is the correct way it is. very hard to explain what im on about, any comments on this would be helpful. ta
 
The actuators/the motors have inside some potentiometers.
You can take one apart and clean the potentiometer inside.
The blue part is the actual potentiometer.
IMG_5403.jpg
The climate control module/computer knows the position of the actuator based on the values it receives from the potentiometers. So wen it sees X ohms it knows to stop the motor. Trouble is that the pots get dirty/damaged over time and so the module does not know it has reached the end of travel so it keeps on going. This eventually weakens and brakes the plastic connecting bit.
 
so you reckon that a new actuator would be the job? as it continues to spin no matter if the plastic is on it or not?
 
I think that climate ecu also measure current that goes through actuator. I made an experiment: connected actuator was taken out and was buzzing in steps infinite after initiating flap function. When placed, i came to one end point, after few buzzes without turning, it stoped.
 
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