I have a similar issue , I put a tire pressure gauge into the center vents once I'd pried the flapper open using a 18" long pry bar , because of my driving style the damned gauge fell down inside the flapper allowing it to close 3/4 again , I live with it , I wish I had a ' meat locker ' in my Coupe but it's cool enough I suppose .
The flapper vacuum element is almost certainly what's bad but I can't seem to reach it after removing the glove box liner , I guess the whole ding dang dashboard has to come off to fix that .
The diaphragm is really cheap , no so much the labor .
R-12 is worth every penny IMO .
-Nate
Randy wrote :
The fan is blowing strong, but right now the problem is the vent door to blow out the lower vents out the console above the radio.......It goes PLOP and starts blowing out the defrost vents, and appears to be vacuum related.
The air is cold, system seems to be working but I am scared to death of changing the buttons at all for fear of having the system stop. so I just change blower speeds and enjoy the meat locker approach.
That's a;; I have for now, I guess I will save some money for a new/rebuilt Klima......sigh
Randy
On Saturday, May 31, 2014 11:45 PM, "vwnate1@... [diesel_mercedes]" <diesel_mercedes@yahoogroups.com> wrote:
DO NOT buy a used one ! .
Rebuilt HVAC control units are easily available from any M-B Partshaus .
Peach Parts , Buy MB PartsEtc. , etc.
NOT cheap .
FWIW , if you have any burnt out wiring (doubtful but it occasionally happens) the fan motor is almost certainly the culprit so remove it and test it , replace as necessary before you fry the rebuilt pushbutton control .
90 + % of the time , intermittent blowing of air (hot or cold) is caused by a worn out fan , they're now cheap @ $100 brandy new .
IIRC , your W-126's fan motor brushes can be easily replaced and Mercedes Source in Bellingham , Wa. sells a $100 (+/-) kit with instructions to do so .
-Nate
Randy wrote :
Okay......I have A/C going, but it's intermittent. We changed out a relay that only cost 300 bucks, due to it being burned out from bad wiring.
But......I have a question.....I think my push button controller may be on it's last leg, and the mechanic I used said he could not find a replacement. Is this true????
I have 1984 300 SD, it's needed tender loving care and I am finally getting a chance to let her have some....any ideas where I can find this?
Thanks all
Randy McLain
baking in Wichitaw, Kansas, land of Toto and Dorothy
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