Your problem is caused by the viscosity of the coolant. As the coolant temps drop the viscosity increases. At about -10C the coolant viscosity is increasing exponentially and hence the reason for the temps leveling off.
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Athlon T'bird 1.33 AXIA Y @1632 (12x136)
Water cooled with refrigerated chiller; idle = full load = 3C Coolant = - 20C
MSI K7T Turbo Raid V3.0
256Meg Crucial PC133 RAM
350W Enermax
Diamond Viper V770 TNT2/Pro
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