Help with Mercedes Part identification

[BoborAnn]

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

 

[Jamie]

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

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..

 

[**THE-RFI-EMI-GUY**]

Can you get a good old part from a junk yard and fit it with a better
heatsink?

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

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"

The Lost Deep Thoughts By: Jack Handey
Before a mad scientist goes mad, there's probably a time
when he's only partially mad. And this is the time when he's
going to throw his best parties.

 

[Jim Adney]

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

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.

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 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.

-

 

[BoborAnn]

Thanks That's the route I'll probably go . I'm looking at a INtersil
RFP70N03 70 Amp .01ohm Rds on device and a pair of 555's one for the astable
and one for the PWM
Any recommendations on a better FET?
Bob