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Old 11-12-2012, 09:52 AM
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1985 300TD AC Compressor?

The AC compressor on my 85 300TD will not engage even though the system is full. I have replaced the fuse in the fuse box, but the compressor still will not come on. Is there another in-line fuse? Any ideas appreciated!


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Old 11-12-2012, 09:56 AM
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Won't a bad pressure switch cause this too?

On my SDL, the compressor wouldn't engage due to a bad compressor clutch.
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Old 11-12-2012, 09:59 AM
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bad RPM sensor, bad klima relay, bad air gap on clutch, etc etc etc... search klima diagnostic
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Old 11-12-2012, 09:59 AM
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For starters, determine if you have power at the compressor. Then you will know if your problem is electrical or mechanical.
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Old 11-12-2012, 08:55 PM
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On my car, same year and model, I have to rev the engine to get the compressor to kick in- been that way for years.

Once I do that, it's fine. If I recall, there's a vacuum operated switch on the driver's side inner fenderwell that enters into the mix somewhere.

Of course, this is assuming you have enough refrigerant and good hi- low pressure switches.
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Old 11-13-2012, 12:49 PM
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Found the problem: the OVP relay had a blown fuse. On the 85, the OVP relay controls the tach and the AC compressor. Maybe on the 84...not sure.

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