Although I appreciate the warning, something here doesn't ring true. Both fans are controlled by two circuits. The A/C slow speed uses a 30 amp circuit through a ballast type resistor, the high speed uses a 15 amp circuit. I was always under the impression that a dc motor uses maximum current at stall. So...jumping the ballast resistor putting full voltage to the fans should lower, not raise, the current flow.
I think you have something else going on inside your auto!