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I think this would cure the problem: (archive)
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Posted by Moni Melman on August 15, 2001 at 21:29:31:

In Reply to: 95 740iL A/C Problems posted by HGS on August 11, 2001 at 22:15:49:

listen up everyone,
I have had over half a dozen bimmers this summer in my shop for the same problem. 4 out of 6 cars had a bad high speed fan. what happens is that this fan kicks in when the refrigerant preasure rises up and the refrigerant gets hotter. the A/C high speed fan cools down the refrigerant in the condenser. if the fan was getting power but the temp or the preasure did not drop, the A/C compressor shuts off to avoid any damage to the system until temp and preasure are back to normal. have the high speed fan inspected by a mechanic or an auto-electrician (like myself......)

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