A/C compressor shuts off at speed on S3 - Alfa Romeo Bulletin Board & Forums
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post #1 of 3 (permalink) Old 06-11-2016, 04:24 PM Thread Starter
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A/C compressor shuts off at speed on S3

My A/C compressor works when idling or at slow speeds (less than 30 mph), but it shuts off at high speed. My mechanic said my alternator is not putting out enough volts to power the compressor; he verified this by connecting a 12 volt source directly to the compressor and it stayed on. I installed a reconditioned BNR 80 amp alternator, but the problem is the same.

Any ideas on what I need to check next?

Kim - 1987 Spider Quadrifoglio (~170K original owner miles)
Huntsville, AL
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post #2 of 3 (permalink) Old 06-11-2016, 06:46 PM
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Ck the ground wire from the engine to the compressor. It a fairly thick wire. The compressed is isolated from the engine due to rubber bushings. There probably sag a little which let it complete the ground circuit at low speeds.

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post #3 of 3 (permalink) Old 06-18-2016, 03:05 PM Thread Starter
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Quote:
Originally Posted by Jim G View Post
Ck the ground wire from the engine to the compressor. It a fairly thick wire. The compressed is isolated from the engine due to rubber bushings. There probably sag a little which let it complete the ground circuit at low speeds.
Jim,

I finally set aside a day to do some serious A/C troubleshooting. I decided to start by tracing the wiring. The first thing I found was that the nut that secures the ground wire was missing. Once I replaced it, the A/C works great! Thanks for the suggestion.
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Kim - 1987 Spider Quadrifoglio (~170K original owner miles)
Huntsville, AL
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