1991 400 SE blower fan not working- please help!

iwona

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Hi, can anyone please help with this one, please :)
Mercedes '91 400SE, fan stopped working- checked fuses, all ok, purchased fan blower resistor regulator- when replaced fan works at full speed constantly even when ignition is off, and the only way to turn it off is to disconnect the battery. I'm totally confused now, I was hoping that replacing regulator will solve the problem, I've read that thermal paste should be used? is that true? What else should I try? any advice would be much appreciated.
Iwona
 

television

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If the motor runs flat out all the time then the regulator has a short if it is the sealed solid state type, the regulator can be tested on an ohmmeter where a diode effect should be present on any pin,, a short circuit reading is a fail
 
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iwona

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Thank you for your reply, just checked it today and readings are 12.5 on min setting, 8.5 -auto, 6.9 -max. The same readings on both regulators old and new one, when old one fitted fan not working at all with new one fan works on full speed constantly :confused:
 
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iwona

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Will buy new one then, any suggestions? Should it be good quality pre -owned or cheaper alternative, found one -made in Germany for £80, MB quoted £360+VAT for new :shock:
 

television

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they are often on Ebay cheap,, surely MB cannot charge that much :shock:
 

Frontstep

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Do you have a part number to post ?
 
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iwona

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Bosch part number 9 140 010 099
 

WG M-B

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Why don't you try a second hand one? Or even ecp if money is an issue? I was told not to buy them off ecp but tried one and it has so far worked perfectly for three+ years!!!
 

Frontstep

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If you look on the American forums there is quite a lot of discussion on this particular part.
It kept coming up when I was reading about the blower resistor problems.
 

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