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Air Conditioning and charging system Troubleshooting 700 1991

posted by  Towey on  Wed Apr 19 00:31 CST 2006
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In a '91 740 the AC was converted to 134a a some time ago but the compressor suddenly stopped a little while ago. The car is now down for maintenance, I am having the speedometer rebuilt (the entire instrument cluster is removed) and I've take the time to replace a leaking heater core, all but the cluster is back in place. Pressure is good at the filler port but the compressor doesn't come on. Does it need the instrument cluster installed to operate? How do you troubleshoot?

One other question, does the alternator exciter get its power via the instrument cluster as the charging system is also inop now and I don't see 12V at the exciter while running (no cluster). The cluster should be back today or tomorrow so I thought I'd tackle that when all was back in place but thought I'd ask anyway.

Thanks






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New Air Conditioning and charging system Troubleshooting [700][1991]
posted by  Towey  on Wed Apr 19 00:31 CST 2006 >


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