high speed is the way to go because you don't want to heat up the ballast resistor and cause it to fail.the plug gilly is refering to is the double pin blue plug----be careful it's brittle.unplug that and full speed fan will be on with ignition.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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