Help with Mercedes Part identification

I have a Mercedes E320 that has a blower that only gets to about 30% of max speed. I've determined its the blower regulator that takes the control voltage that varies from approximately 0-8 VDC in 8 steps and controls the ground connection of the blower ( which has its Hot tied to +12) The problem is that Mercedes realized that this part ( that cost $190 )was a bad design and redesigned it for better cooling BUT you need change the Blower ( another $400+ ) and add a bracket ( another $50) to use the new one . I've checked all the MB forums and the answer is simply buy it for $700+ S I opened it up and this regulator is a single 4 terminal device that has boot over it with the markings 9 140 010 179 Made in France 90.943.02.385 Removing the Boot reveals a device that looks like a high current rectifier approximately by 1"X1" X1/2: with a metal surface for attachment to a heatsink ( they use the blower frame for a heatsink. This device has the markings bk133.1 2fb-5 and I believe its made by Behr I'd appreciate any help people can offer on what this device might be I'd like to get a reasonably priced replacement or design a replacement for it I can send photos ( sorry I have no place to post them) Also Please no comments on buying this Car my wife always wanted one and has regretted it since we picked it up Thanks in Advance Bob

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BoborAnn
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a simple PWM supply using a Mos Power fet as the driver will do fine. just a simple variable voltage source via a Pulse width modulator turning off/on a Power Fet at the correct duty cycle to get the desired speed you want. the PWM simply fully saturates the Fet as a switch action at low R when on. this places the Fet into very low R state and thus will not heat up. line an analog type variable regulator. the pulse can be generated via a simple 555 timer etc..

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Joe Leikhim K4SAT
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The first # looks like a Bosch #. I THINK the second one is in the format that M-B uses, but it's been a few years since I dealt with those.

I don't recognize those numbers. Have you tried Googling on them?

It would be helpful to know how this module works and what they did differently in the revised module.

I agree that a PWM approach would probably be the most promising, but you have to be careful because automotive applications are pretty tough on electronics.

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----------------------------------------------- Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA

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BoborAnn

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