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Old 08-10-2009, 04:22 PM
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W123 Climate Control - Re-solder where?

I got the Climate Control Unit out using the DIY listed on this website. However, I am unclear what to actually re-solder. Do I do every point on this circuit board? The article references to 're-solder where the three connectors meet' but I do not see any junction like this. Any help in the right direction will really help.

Thanks
Doug

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Old 08-10-2009, 05:37 PM
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As long as you are in there, might as well resolder every junction you can reach. Any solder joint could be a cold solder joint so you might as well do all of them. Be careful to not add so much extra solder that you cause a short-circuit by jumping pads and don't use any hotter a soldering iron than necessary.

In the case of my '85, it had some very poorly done repairs (by a PO) after a frozen aux water pump caused several pc board traces to fry. I rebuilt the board and it has worked perfectly since.

Jeremy
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Old 08-10-2009, 05:37 PM
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I'm not sure of the three connectors either, but check all solder points.
In the pic is a circle of one I re-soldered, in the lower circle, I drew a black circle to represent a crack.
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W123 Climate Control - Re-solder where?-fake-cold-solder.jpg  
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Old 08-10-2009, 05:47 PM
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Quote:
Originally Posted by Doug183 View Post
However, I am unclear what to actually re-solder. Do I do every point on this circuit board? The article references to 're-solder where the three connectors meet' but I do not see any junction like this. Any help in the right direction will really help.
The most common location of cracked joints is between the larger board and the terminals on either end. (In other words, where the horizontal and vertical boards connect; the edges of the primary board.)
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Old 08-10-2009, 07:50 PM
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Thanks. I also found this very good write up.

http://w123maintenance.blogspot.com/2007/10/automatic-climate-control-unit-repair.html

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