[W126 Coupe] climate control problem ??

[Gary]

without notice a/c, heater, blower just stop working.  all that happens is lots 
of hot air comes from the windshield defroster vents.  i switched out the 
climate control part with a working one and still nothing.

there is a differnce in climate control part number.   the donor part comes from 
an 88 560 sec, number 126 830 08 85 the other part number is 126 830 11 85 and 
that belongs to my 91 560 sec.

seems line the problem comes before power gets to the climate control unit.

a while back while trouble shooting my old sec's climate control, i noticed when 
i would press the a/c button you could audibly here a click under the hood.  
this doesn't happen with either part.

is there a relay that would cause all of this to shut down?  

thanks for your help.  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20101118/cd13c7d8/attachment.htm>