- Dec 15, 2008
- Reaction score
- PRESTON, LANCS.
- Your Mercedes
- 97. E300.TD. 7 SEAT.ELEGANCE. EST.TOYOTA SUPRA MK4. RS. VAUX. CORSA.GLS AUTO. SPORT.
the air con / heater fan packed up on my 97. e300 td. so investigated and found the zenner diode speed controller had burned out. it was larger than the diodes i have been familiar with but estimated it would cost circa £25. i contacted the mb dealers, they said it is a siemen's part and may not be available any more ? three days later they came back saying the diode was not available any more and would have cost £170. the full blower unit was available at £625. meanwhile i shorted out the speed control diode and mounted an on / off swich under the glove box, this gave fan on full speed or off. i contacted dronsfields at oldham explaining my predicament, they said the current speed control diode from the new models could be modified to do the job. they supplied the new update diode £170 and showed me how to machine the finned diecast finns in the blower motor to locate the new diode and how to alter the wiring. it woked perfectly, as far as mb main dealers were concerned i could either have the new blower motor at £625 or do without the facility, not nice. i contacted mb's HQ in holland to complain and they more or less told me to go away sexually. herbiemercman.