How competent are you with auto electric? There are simple hacks and there are better hacks.

1) Simple hack -Wire a toggle switch into the cabin to jump/connect the high pressure switch on the rec/drier. Toggle it when A/C is on. This will turn on the aux fan at slow speed thru the R14 ( may be R15, cannot remember ).

2) Another hack - Wire a toggle switch into the cabin to jump/connect 1 pin of the thermostat on the engine block to ground. Toggle it when A/C is on. This will turn on the aux fan at full speed.

3) Good hack - Splice into the compressor wiring or Kilma pin 7 to get a switched 12v. Then wire up what compu_85 drew. I also posted it earlier.

Good luck.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.