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Usually, when the ballast resistor fails on the lower setting, the fan will not run at the slow speed - it does not revert automatically to the higher speed.
So your car will be left operating on one fan @ the slow speed, but if you think your temps are maybe too high, switch on the A/C which automatically reverts fans to high speed.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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