svpmx83

For those looking for an electric radiator fan controller option to go with aftermarket ECUs, I thought I should post the following info researched during the FrankenCIS project for posterity
http://www.frankencis.com/Forum/aft/32

I'm currently using one to control my S4 electric fans, and have a second on the Spal AC pusher fan

Soft start high amp capable oem variable speed fan controllers used in many Mercedes vehicles and the C6 Corvette



Mercedes units have ignition and PWM signal lines

Corvette just has the PWM

Both have very high current ratings and include soft start of the fan by default

~100hz signal ground switched between 10% and 90% duty on the PWM line is all that is needed for the Corvette unit

The Mercedes required 12v to the ignition terminal, and ~100hz signal ground switched between 10% and 90% duty on the PWM line

10% is off on both
90% is full speed on both
values between 15% and 90% produce a variable speed relative to the signal

if no PWM signal found on the Mercedes unit and ignition is on it will go into a full speed failsafe mode

The Mercedes unit could be run with just the ignition signal as a basic soft start fan controller

MainePorsche

Is this unit set for AC operation ? At how many speeds (%) ?
Can the unit be set to keep the engine at a desired temperature ?
Does the unit have input(s) for to activate via torque converter temp, air intake temp, and AC high pressure switch signal ?

svpmx83

it's not a standalone unit, it must be controlled by a suitable engine ECU

Stock GM for the several engine swaps that have occurred here recently
or suitable aftermarket for the EFI upgraders

Herman K

Which model year MB has this controller?

svpmx83

2000> S and CL Class part # A 027 545 64 32
also other models in the same era including the smaller C Class with varying part numbers

FLYVMO

Excellent! Thank you for sharing your research. More options

Cheers!
Carl

Eplebnista

Honestly Bob, don't be such a wimp. All you need is a couple of analog to digital converters feeding in to a Harbor Freight Illudium PU-36 Space Modulator to send the right signals back to the controller. Easy-Peasy....

hans14914

Great info, I was always curious what the PWM frequency was on these units.

Do you happen to have a connector/pin part numbers?

Thanks
Hans

Eplebnista

Hans:

http://www.lateral-g.net/forums/showthread.php4?t=40215

and

http://www.pro-touring.com/threads/1...fan-controller