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#1
04-02-2006, 06:14 PM
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climate control
I noticed this question was posted in 2005, but did not see any answers. Please help.
I have a 1978 300 CD. The defroster is the only thing that works on the climate control panel. I'm not sure what to do, we replaced the climate control switch assembly and still have just defrost. We don't really have history on this car, was purchased at an auction. Live in Texas and really need AC. Thanks for any help you can give. Jenkins 
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#2
04-02-2006, 07:27 PM
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You have a vacuum leak. The system is stopped (except in defrost) untill vacuum exists by a master vacuum switch. That is the easy answer.
Since there is about a billion ways you could be losing the vacuum, throwing parts at it may never succeed. You need a plan and information. Start with a vacuum schematic and identify the switch I'm talking about and the vacuum to it. 78 models had the whole vacuum harness laid under the battery and the tubes are made from baking soda, they go poof is an acidic atmosphere, great planning. The main vacuum and first place to check would be the thermo vacuum switch at the base of the servo. If there isn't vacuum there you have a place to start. One piece of info I can tell you is that the push button are almost never the problem. The only time I have seen them bad was after battery acid was sucked into them. Wasn't actually the pushbuttons, but the push on connector and the steel inserts the tubes hooked to.
__________________
Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#4
04-02-2006, 07:42 PM
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climate control
Thank you so much for your help.
Truly, I'm not stupid, just the first mercedes we've ever owned...what's a thermo vacuum switch and a servo? We've rebuilt motors and transmissions, etc on american made cars, do you think this vacuum issue is more tricky than that. I guess the real question is do we need to take it in somewhere?
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