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drosen, here are info and photos from my 103 motor (W124 chassis). Two engine components control the aux fan:
1) a coolant temperature sensor located on the top left side of the engine block, back at about cylinder 4. It's a 2-wire thermistor with a blue base, which M-B refers to as component B10/8. That one is designed to turn the aux fan on to high speed when coolant temp reaches around 100 degrees C. Test it like this: key on, engine off. Pull off the connector to B10/8 and the fan comes on high speed. Replace connector and it goes off.
2) a red-colored high pressure switch located on the A/C receiver/drier, designed to turn the aux fan on to low speed when the A/C condenser pressure reaches about 15 bar, as I recall. Test it like this: key on, engine off. jumper the 2 wires at the pigtail connection and the fan comes on low speed. Just slide the plastic sleeves back a bit, and jump those wires. Easy and fast.
If either of those tests is unsuccesful, post back, and get advice on the next tests to perform.
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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member
Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'
There are only 10 kinds of people in the world--those who understand binary and those who don't
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