Back window defroster control?? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 09-24-2013, 09:12 AM Thread Starter
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Back window defroster control??

Restoration of my '71 220D is going well (got it inspected and on the road! And rust-free!!), so now I have time to think of other things, such as... where's the control for the back window defroster?

And what did the little knob between the preglow resistor and the key insert used to control? It's connected to a push-pull wire (not electrical) that has been cut.
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post #2 of 7 (permalink) Old 09-24-2013, 05:08 PM
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The "thumb screw" knob between the key and the pre-glow indicator is an idle adjuster. When the engine is cold you turn it and it's like stepping on the accelerator a little bit. Use it like you might use a manual choke (it's not a choke - it does not change the fuel mixture it just increases the throttle)

If yours is broken either your car is difficult to keep running at idle when it's cold or it idles too fast when hot. They are relatively easy to fix or replace. The one end is just behind the knob and it goes through the firewall up to the top of the engine on the drivers side. There it is connected to the throttle linkage.

I'll try to post a photo if I can find one.

You can find all of the parts you'll need easily.


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post #3 of 7 (permalink) Old 09-25-2013, 04:21 AM
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Exactly that, if yours is broken I have a new one for that model, original one

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post #4 of 7 (permalink) Old 09-25-2013, 04:12 PM
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idle speed increase adjustment .
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post #5 of 7 (permalink) Old 09-26-2013, 03:20 PM
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Here is a photo of where the other end goes
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post #6 of 7 (permalink) Old 09-28-2013, 06:10 PM Thread Starter
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Thanks a lot, guys. That's it! Nothing in the manuals about it...
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post #7 of 7 (permalink) Old 09-28-2013, 06:11 PM Thread Starter
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Thanks! That's it! It should be easy to find the other end when I get to it...
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