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  #1  
Old 04-25-2004, 03:16 AM
sixto's Avatar
smoke gets in your eyes
 
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Location: SF Bay Area
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can a late 126 ACC PBU be resoldered?

I read BoostnBenz's instructions on resoldering an ACC PBU -

DIY page. Introduction to Resoldering Climate Control Unit

My SDL's ACC and bulb out warning have been quirky so I thought I'd give resoldering a shot. I removed the lower cover of the PBU and saw a PCB with a bunch of solders. Is there a way to remove this board to get to the innards? Seems like the mode buttons and other things attached to the hidden side of the PCB won't let it come off. Any ideas?

The light control relay is more straightforward. I thought I'd find something loose because sometimes the bulb out light comes on after a hard turn. It looks perfectly good but I wouldn't know a bad solder joint if it bit me.

I plan to melt each solder joint and let it set. Is there anything else I should do while I have these things out and apart?

Thanks,
Sixto
95 S420
87 300SDL
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Old 04-25-2004, 08:28 PM
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Location: Central Oregon
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I didn't go deep...

But I just resoldered two units a 123 and a 126 and I just tried both of them today in my 81 and they seemed to work perfectly. One wouldn't run the footwell heat and the other wouldn't run the ac compressor.

I just went through adn touched up all the solder points. The worst I think ar ethe ones down each side where bosstnbenz has highlighted in his photos. I found at least two joints there that were bad so I know I musta helped something...
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  #3  
Old 04-25-2004, 09:24 PM
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smoke gets in your eyes
 
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That's just it - the 86-up PBU innards are different. The thumbwheel isn't in a separate box and it has a ribbon cable connecting to the main board.

Sixto
95 S420
87 300SDL
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Old 04-26-2004, 09:02 AM
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Ohhhh,

Sorry about that.
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'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique
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  #5  
Old 07-24-2008, 04:56 PM
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Quote:
Originally Posted by sixto View Post
That's just it - the 86-up PBU innards are different. The thumbwheel isn't in a separate box and it has a ribbon cable connecting to the main board.

Sixto
95 S420
87 300SDL
Sixto...

How are bulbs in late model CCU replaced? Seem no needle nose pliers can reach it.

Thanks
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1987 300SDL 314K mi, counting; #22 Head
1999 E300Turbo 405K original miles
1997 E320 180K mi (Son's)
2002 ML320 (Son's)
1998 S320 140K mi (Son's) sold
1985 300SD 311K mi
1984 300D 324K mi (killed by a hit-n-run turd)
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Old 07-25-2008, 11:03 PM
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Heat-shrink tubing, rubber line, either will grip the bulb and pull it out.
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