ac question 1973 280 sel - Page 3 - Mercedes-Benz Forum

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post #21 of 25 (permalink) Old 06-27-2014, 08:03 AM Thread Starter
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Vehicle: 1973 280SEL 4.5
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Thanks! Part is on the way. I'll post and let you all know how it goes. Appreciate the help.
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post #22 of 25 (permalink) Old 06-28-2014, 10:35 AM
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What's worked for me is to take the original blower switch out and clean it with an electric contact cleaner such as DeoxIT. A lot of stuff builds up in there over time.
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post #23 of 25 (permalink) Old 07-05-2014, 03:00 PM Thread Starter
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I installed the part, and the ac fired up right up. I smelled a faint burning smell, so I turned it off. I reinstalled the old switch just to double check it, and it still didn't work, so I put the new one back in. Now, ac won't work again. Does it look like I wired it correctly? Could I have burnt up the new switch?

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post #24 of 25 (permalink) Old 07-05-2014, 08:20 PM
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Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
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Hard to say by just looking at a photo. The switch works almost like the original but without the infinite speed control. There should be one 12v input to the switch. There are two output contacts. One puts out 0 or 12v (does not go through the resistors) and it should jump over to the temperature knob. This is power to the clutch. The other output comes from the resistors. At high speed it should be 12v and then progressively less for lower speeds. This contact powers the blower.

I don't remember what colors go where and I would have to look at the switch to see which contact is which. If you have a volt meter that also measures resistance, it should be easy to figure out.
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post #25 of 25 (permalink) Old 07-06-2014, 11:11 AM Thread Starter
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Now the test light is not even lighting up. I think I probably goofed something up. I may take it to a new mechanic to see what they say. It's got to be a simple fix, but seems to be beyond what I can do. I really appreciate the help everyone. Thanks!

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