To demagnetize metal follow this proceedure;
1. Using an electromagnet with AC voltage applied, put the metal to be demagnetized on the electromagnet so that a good magnetic circuit or coupling is achieved.
2. Then slowly seperate the electromagnet from the magnetized part.
The constantly reversing magnetic field of the electromagnet will slowly weaken as the distance is increased and the part will be left with a neutral magnetic charge.
From your description of the problem, I doubt that a permanently magnetized shaft is your problem. I would suggest that you are low on freon and the low side pressure switch is causing the compressor to cut off when the pressure is too low which will occur during high RPM and low on freon.
I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k