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  #1  
Old 05-24-2009, 02:24 PM
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Join Date: May 2009
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79 300SD intermittant AC........

Hi, just bought a 79 300SD and the owner says the AC only works intermittant usually when the defrost is button is pressed........any ideas??

also, 3 windows dont work........usually motors or regulators? thanks....
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  #2  
Old 05-24-2009, 04:52 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,027
Welcome to the board...
I suspect this is an issue with the buttons on your dash..
My 1981 wagon only considered me pushing those buttons as " very mild suggestions".... it might come on then, maybe in 20 minutes, maybe never....
Check to see that your vacuum system is holding good vacuum .
Also plenty of stuff in the archives available with the search function...sometimes faster and more complete than waiting for live answers .
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Old 05-24-2009, 06:01 PM
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Are the buttons vacuum operated or electrical?
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  #4  
Old 05-24-2009, 07:34 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,027
I think the way they would be described is ' vacuum over electrical'.....
There are some good threads about dealing with these in the archives....
When I saw the diagnostic chart in the FSM I gave up.... sold the wagon to get the type one AC in my car...
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