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#1
09-14-2011, 08:47 PM
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Another tach/ac question
Hello all,
As some of you might know now I bought my grandmother's 84 300sd this past sunday. Its in good shape and I plan to keep it that way a fix a couple of issues. The tach is not working and I have been reading up on the amps and pretty much came up with the conclusion that this model does not have the amp on the driver fender wall. I read it is in the passenger footwell. If this is the case is it still an easy fix like the cigarette butt fix or do I need new parts? I also read about the amp getting the signal from the EGR which also affects the air conditioning. Is this the case on the 84? I tried to add a can of R12 to the car but it wouldnt take it even though it did kick on the compressor. It tried to cool and it got a little cool but not really. How can I know if my EGR is disabled? I just need a little guidance to get me started. I am not knowledgable in the diesel world as I only had this one and another 82 300sd for only a short period of time and the rest of my MB know how is in the gasser realm. Thanks for the input
__________________
1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual 
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#2
09-14-2011, 11:31 PM
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You should get the service manual on CDs (2) for the wiring diagrams and parts location. They are available from MB and ebay for about $20.
__________________
85 300 SD ~ 115K 82 500 SEC Euro ??K 78 450SL 164K
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#3
09-19-2011, 11:55 PM
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Well this one turned out to be an easy fix. The tach was disconnected behind the instrument cluster. Plugged it back in and it roared back to life. I'm happy.
__________________
1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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