To all,

I have read most of the threads in the forum about aux fans not working and have tried most things but the fans in my 190e 2.6 are not coming on. Here's what I have done:

1. Connected power direct to the fans - work fine.
2. Pulled the wires from the red A/C pressure switch and jumped them, fans came on when ignition turned on.
3. Pulled connector from the blue temp sensor on the head - no fans. Jumped it - no fans.
4. Replaced the resistor - was looking a little burned.

Any thoughts on what to try next?

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Chris
93 190e 2.6 147k
81 240D 265k
89 Range Rover 165k

Aux. fan relay? I had to replace mine because the fan wouldn't stop running...contacts were stuck. So maybe yours isn't operating.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Aux fan relay has a fuse on top..it is under relay compartment cover, behind fuse box..

I'm having the same problem,,, but I'm a 1988 190e 2.3 I was not able to locate the Aux fan relay with a fuse on top..it is under relay compartment cover, behind fuse box..

I did locate an additional relay compartment in front of the fuse box, it has two relays and 4 fuses (2 red 2 blue)

I jumpered the two wires on the RED temp sensor and the electro mech fan on the serpantine belt engaged, but the aux fan did not. Applying 12 volts to the aux fan resistor turns on the aux fan, as does jumpering the refridge hi temp switch,,, I'm confused, my car doesn't appear to conform to the schematics for 1988 cars,,, maybe I'll check 1987 schematic ,,,

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Closing the store
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Problem solved - I ended up taking it to a local shop - it was the Aux Fan Relay - just ahead of the fuse box with it's own cover. Mine was black - unlike the orange/red replacement. The fans would come on when jumping the pressure switch on the receiver/dryer, but not when the temp switch was unplugged on the head. Replaced the relay and all is well.

I also install a lower temp thermostat as well to keep it running cooler. The MB part number is:

1162000015

Also, not sure where he got it - but a wiring diagram was key in finding the relay.

__________________
Chris
93 190e 2.6 147k
81 240D 265k
89 Range Rover 165k