test wires to what?
what did you wire the pos and neg to?
directly to the battery? relay?
when the fan maxes out it is really a lot of amps. could be something in your wiring going into overload mode and shutting down power to the fan, rather than the fan trying to limit speed?

Hey thanks , it turned out to be the wires I was just praying that it wasn't the fan since I got it from Craig's list just hope my switch will hold it thanks Frank

what box are you talking about?

The fan controller.

lol, lets not play twenty questions.

is it this fan controler?
https://board.moparts.org/ubbthreads/show...e=0#Post6953270

which version?

depending on your version in automatic that would be normal.
it will dial the speed back down as your temps go down.
it only uses enough fan to maintain the temp setting in the controler.

if you need/want a faster setting, then you have to change the temp dial down so it thinks it is running hotter.

if you are talking about some other controler, please let us know which one and how you have it wired.

Andy, he had v2 of my controller. It developed some sort of hardware issue and was intermittent for a while, then I believe it died completely. He has a v3 box on it's way to him now (though it should be there by now?)

Hasn't arrived yet but should be here in the next days. Yeah the controller had some issues which weren't normal but Dave was very helpful and I decided to just go with a v3 box.
I was just curious because the previous poster had issues that were the same I has for some time (before the box died).

actually he wasn't using a controler box at all.
he had it directly wired but had too small a line running to it.

Well,...I'm running a little late for the party,...but finally got the Monster mounted to my Glen Ray 956. A bit pricey combo, but it's a puuurtty tang taint it.

I was going to throw a stock fan & shroud on it for now & get around to the Monster later, but the stock shroud ran into my System One oil filter & would have needed a notch cut in it. So I said, if I'm going to have to cut on a shroud, might as well be the Monster.

I cut the 4 unneeded lugs off, then shaved ~ 1/4" off the shroud. It fits with only 3/16" clearance after shortening the pump shaft & bolt heads.

As it sets right now in the pix looks as if the shroud can go in another 200th with that last shave that I made, "IF" I cut the flanges to clear the bolt boss's.

It want be as nice looking, but if I cut the flanges to let the boss's come through then the rest of the flange can seat to the long flats of the rad bracket. Then I'll have to make 4 U shaped washers to secure the shroud.

The reason for this last ~ 200 thou is, I think that'll give me ~ 3/8 clearance. Then maybe I can squeeze a belt through there, with a little flex from the fan shroud too.

Thats a 26" radiator right? anyone worked out how to install the MB fan on a 22" radiator?

sawzall

Hi and first an apology, I am a not a Mopar owner but have admired from afar having modified plenty of UK metal for street and strip. Did get a Camaro but wife did not like left hookers on UK roads, so bought a Granada and put a V8 in it, she did not like that either, it was too fast! So, to keep the peace.............I divorced her!

And another apology for the long first post.

I am here looking for help so I can replace the Lincoln MK VIII electric fan that has given great service in my Land Cruiser used for off road expeditions. I will offer plenty of info so members are as well informed as possible.

The MK VIII fan is a brilliant two speed unit however Siemens no longer produce the fan motor and mine is showing its age. All aftermarket ones seem to be the single speed pulse width controlled unit, as opposed to my distinct two speed motor, the situation is made worse when you discover the aftermarket ones are cheap rubbish in Mexico! Decent second hand units are thin on the ground so felt something a little more recent would be better.

A customer of mine needed work done on his Mercedes ML transmission, the e fan on his ride caught my eye, some research later led me to this great thread.....what a result!

At the moment my MK VIII fan is wired using a typical relay set up with dashboard indicators, and a switch to disable during water crossings, you get the idea.

My rad core is 27.5 x 16.5 inches, so reckon I can squeeze in the Mercedes C class fan. My issue is with mixing electronic devices with off road driving, I am 12v savvy though not so hot with electronics. My present fan can be jury rigged if need be direct to a battery to get me out of trouble if a sensor or relay fails, and reading through the thread it seems there are two fans, one that can be wired direct to a battery which would give max speed, I can alter my wiring and introduce a resistor to get a second speed to suit my setup.

Can anyone post up as much info as possible so I can identify the correct version that does not need a PWM module to make it work? There was mention of photos showing the difference but they were missing from the post?

Any help would be appreciated, TIA.

Regards

Dave

photobucket killed those pics.
The links might be openable if you direct paste them into a browser.

https://board.moparts.org/ubbthreads/ubbt...tml#Post1128594

this is the aftermarket controler a member built so you don't need to worry which one you get. but the typical factory one can be wired direct.

I added a failsafe temp controler to bypass the controler should it fail, but had to add diaodes to the circuit or the backfeeding caused the fans to tick and drain the battery.

feets would have to repost his pics of both types of fans if the old links don't work.

Thanks for that, just off to bed so will check out the link tomorrow.

Regards

Dave

Great that link worked Andrewh, many thanks.

Some picture links were downloadable and viewable, but the one where it is mentioned about pictures that show old and new there were no links, I assume these have been deleted in the past?

As mentioned my preference for direct control of the fan speed, i.e.using a resistor to give me two speeds however, the controller you linked to appears to be purpose built, and I may follow that up as a sealed unit was mentioned.

The thread did confuse me a little so could do with some clarification of the correct fan and if possible some parts numbers?

I did note there were 400 and 600 watt motors mentioned and I have even seen 850 watt versions for sale, but the shroud on the 850 unit looked more 'square' and if I have the dimensions right too large to fit my radiator.

I am not averse to some swapping about, perhaps the 600 fan on the 850 motor?

I did see there was not a lot of activity on this particular thread of recent, so assume all is working fine.

Anyone who can chime in with any info would be appreciated.

Many thanks,

Regards

Dave

I am afraid I don't know anything about the motors.
as for using a resistor, we found that is not going to do anything.
The fan is either on full or off by direct power.
The controler I linked will help control fan speed. It has multiple settings based on engine temp.

If you don't want a controler, then on or off are the two choices if you get the correct fan.
The other type won't run long without the controler.

if feets doesn't show soon to post the pics of the two fan types I will try to at least get a pic of the fans that can run without the controler.

Andrew is correct. The only way we found to modify the speed was with my controller sending the proper signals. And at that point, I might as well monitor the engine temperature and use the full range of speeds that are available.

I have a customer right now that wants the air conditioning input lowered to 25% output (from 50%), since that's enough to cool him down before he shuts off, and he doesn't want the additional noise of 50%.

Thanks for the replies guys. Any reason the fan that Andrew mentioned being full on @ 12v cannot be brought down to say 50% via a resistor, I assume it is a dc motor?

I don't fancy changing my sensor/relay wiring setup around that has been reliable under all conditions, I also have dashboard indication of slow and fast, so everything is in place.

The speed controller is a nice touch and I bow to your knowledge, that is still under consideration but I too have particular requirements to suit my usage pattern.

I have trolled through 2000+ ebay adverts looking for the right fan and shroud dimensions and think I am getting somewhere, damn if I could pick up a brand new MK VIII fan I would not be bothering you guys. I have to accept I need an alternative fan option, your help is appreciated.

Regards

Dave

Unfortunately, it's not just a DC motor. Otherwise it would be relatively easy to change the speed by changing the voltage.

The electronics on the fan itself use 4 large wires connected to the motor to make the fan run at whatever speed it's commanded to.

The full speed on/off mode is technically a fail-safe mode in case it loses the speed control signal.