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#1
07-11-2013, 06:32 AM
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1983 300sd HVAC periocally stops working
1983 300SD. AC and heat work great. Recently when you press one of the buttons the AC won't come on and will turn on and then off (this is in the max position or any position). Low has never worked but hi and auto always have. Another thing that might be part if it is while driving, even with the system off, every now and then you can hear the push button area making an electrical type noise behind the wood bezel. Almost sounds like something trying to make an electrical contact of some sort or a faded buzzer type sound. Anyone have a similar issue?
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2022 Nissan Frontier Pro4x 1990 Mercedes 420SEL 1950 Packard 8 Previous German cars- 2001 Mercedes SL500 1983 Mercedes 300SD 2011 BMW 328i (manual) 2008 BMW 535xi (manual) 2006 BMW M3 (manual) 1980 Mercedes 300TD 2006 BMW 750i 1996 Mercedes E300D 1994 BMW 740i 2006 BMW 330xi (manual) 1999 E300DT Smoke silver/black 253k 2012 BMW 535i Xdrive M-Sport 1984 300TD-T 304k 1988 Mercedes 560SEL (parts car) 2010 BMW 550i xdrive 2017 Audi A4 Presitge 1979 300SD 313k 2003 E500 189k Last edited by turbozeke418; 07-12-2013 at 12:22 AM. 
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#2
07-11-2013, 08:20 AM
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The usual culprit is a failing ACC unit itself, however, you do have odd symptoms.
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