Mercedes Cooling Fan temperature settings (reposted youtube)

[Tom Pryor]

Re posted my Video as Public...Sorry! It demonstrates the functionality of
the revised controller for our MB (EVC) Electronic Viscous Fan /Fan clutch.

https://www.youtube.com/watch?v=vjA_INl9y80

--
Regards,

Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186

1977 23'B named "CASPER", HARDLY ORIGINAL, (455 EFI) (Pwr. Drive)
(tailgate) (rear bunk beds)
(Webasto petrol boiler) (MB Elect fan clutch) (Brake reaction arms) BUT
STILL A WORK IN PROGRESS!

ReplyForward

 

[SteveW]

THANK YOU TOM !!!

I have been anxiously awaiting this development and am ready to plug it in.

I've got what might be an early version of the Mercedes fan controller - the temperature setting is done with a small wooden screwdriver (toothpick).
I don't immediately recall where the temperature sensor is - but I kinda recall that it's in the christmas tree hole (TVS).

Might I be so lucky such that this is an easy replacement ?? ie very similar wiring...

1973 23 footer, Griffin aluminum radiator, all Patterson (HEI) ignition, Patterson carburetor, 3.70, Digipanel, 100K miles.

Thanks again !!

Steve W
Southern California
--
Steve W
1973 : 23'
Southern California

 

[Keith V]

interesting, I like the over ride option.
How did you pick the PWM period. it seems slow to me

Keith
78 Royale
Microlevel
________________________________
From: Gmclist on behalf of Steve Weinstock via Gmclist
Sent: Friday, October 9, 2020 2:10 PM
To: gmclist
Cc: Steve Weinstock
Subject: Re: [GMCnet] Mercedes Cooling Fan temperature settings (reposted youtube)

THANK YOU TOM !!!

I have been anxiously awaiting this development and am ready to plug it in.

I've got what might be an early version of the Mercedes fan controller - the temperature setting is done with a small wooden screwdriver (toothpick).
I don't immediately recall where the temperature sensor is - but I kinda recall that it's in the christmas tree hole (TVS).

Might I be so lucky such that this is an easy replacement ?? ie very similar wiring...

1973 23 footer, Griffin aluminum radiator, all Patterson (HEI) ignition, Patterson carburetor, 3.70, Digipanel, 100K miles.

Thanks again !!

Steve W
Southern California
--
Steve W
1973 : 23'
Southern California

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[78gmcroyale]

So how healthy is it for the fan clutch valve to be rapidly opening & closing like that switch in your demo video?  I would love to know how Mercedes manages it in their computer software. Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Thomas Pryor via Gmclist Date: 10/9/20 9:21 AM (GMT-06:00) To: gmclist Cc: Thomas Pryor Subject: Re: [GMCnet] Mercedes Cooling Fan temperature settings (reposted youtube) Re posted my Video as Public...Sorry!  It demonstrates the functionality ofthe revised controller for our MB (EVC) Electronic Viscous Fan /Fan clutch.https://www.youtube.com/watch?v=vjA_INl9y80-- Regards,Tom Pryor4188 Limerick DrLake Wales, Fl 33859Cell 248 470 91861977 23'B named "CASPER",  HARDLY ORIGINAL, (455 EFI) (Pwr. Drive)(tailgate) (rear bunk beds)(Webasto petrol boiler) (MB Elect fan clutch) (Brake reaction arms) BUTSTILL A WORK IN PROGRESS!ReplyForward_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Tom Pryor]

In my discussions and investigations with BorgWarner who designed and developed the Fan/Fan Clutch Assembly for Mercedes Benz. The module I have
created emulates the PWM Frequency and Duty cycle they use. In addition to the turn off and turn off temperatures from the on board Engine management
system they have an ability to write programs that start the fan at Low speed and as the temperature rises they can increase the speed. Quite a
feature! With the age of our fleet of coaches, I don't believe we could write a program (algorithm) that could cover all the requirement ranges.
Besides, I'm just not motivated!

 

[Tom Pryor]

Some how an earlier posting did not arrive on the Forum. So I will update you:

I am building 10 modules this week:

1) Some of them will be for retrofitting the Dumb Controllers that were shipped by Jim At Applied. These will be Called "FAN 2 RETRO" and will
include new wiring, Radiator Probe/switch, MB connector. Sorry old wiring and temp probe must be discarded.

2) Some of the them will be for EFI users. These units will use a "trigger to ground" or C2 on the EBL ECU. I'm reasonably sure other
EFI can use the same feature, yes? These will be called "FAN 2 EFI"

3) Some will be used to replenish the depleted inventory Applied GMC inventory of Full kits. SEE: https://www.gmcrvparts.com/product-p/g46104.htm

 

[SteveW]

Thanks again Tom !!!

I’m kinda wondering how many of us have this kit... 50 ? 100 ?? 200 ?? More ??

Steve W
Southern California

--
Steve W
1973 : 23'
Southern California

 

[jim kanomata1]

My experience with the switching for over 20,000 miles has not
effected that as it cycles about every 50 miles or more depending on the
conditions.

On Sun, Oct 11, 2020 at 1:57 PM Steve Weinstock via Gmclist <

> Thanks again Tom !!!
>
> I’m kinda wondering how many of us have this kit... 50 ? 100 ?? 200
> ?? More ??
>
> Steve W
> Southern California
>
>
> --
> Steve W
> 1973 : 23'
> Southern California
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502