Recirculation Rocker Switch Above Push Button Unit - Mercedes-Benz Forum
 
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post #1 of 3 (permalink) Old 05-13-2019, 07:59 PM Thread Starter
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Recirculation Rocker Switch Above Push Button Unit

My 560sl switch appeared to be non-functional, in that the red light would not light when the switch was pushed. So I took it apart and put it back together wrong as it still did not work. Took it apart again and put it back together a different way and so now the red light comes on when you push the top part and then goes off when you push the red light. I checked and the vacuum flow through it does not seem to change (that I can tell). Can anyone tell me what happens with the three way branch A/B/C when the light is on and off. In other words with the red light off (default) is B and C connected? And when the red light is switched on A releases the vacuum? Or better yet what are the vent pods supposed to do?

I have always heard that the Germans can take something simple and turn it into something extremely complex. They must have been talking about the R107, AC IV.
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post #2 of 3 (permalink) Old 05-14-2019, 09:43 AM
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When you press that button, the two fresh air flaps should push upwards and close off the cabin to the outside world.

You can observe this by removing either the instrument cluster or glove box and looking up. You'll see one of the fresh air flaps push upwards to close.

Not that complicated, just frustrating when it isn't working right
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post #3 of 3 (permalink) Old 05-14-2019, 01:35 PM Thread Starter
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Thanks....I guess the circular diagram illustrates the airflow going in circles and the red light denotes that it is recirculating. I have the same picture in my C280, but never use it and didn't know what it meant. I think this means that the switch defaults to B and C vacuum lines dumping to the vent A. When the switch is activated it links B and C together and disconnects A while opening the vacuum solenoid on circuit 4.
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