Quote:
Originally Posted by throne7
Is there a way I can hot wire it so it will turn on when I need it to cool the radiator?
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Mercedes has already done that for you. As Gilly said, the fan is controlled by both the high pressure switch on the receiver/drier when your A/C is running, and by a coolant temp sensor all the time. If those two components are working properly, and if your A/C system is properly charged, and if the aux fan circuit is good (relays, fuses, series resistor, wiring, and fan motor), there's no need to devise a work-around. Why not just fix the underlying problem rather than trying to "trick" the system. Especially since the aux fan circuit is particularly easy to troubleshoot.