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Old 06-08-2013, 05:32 AM   #1
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Side radiator fans run at all times

I have a 1996 Cummins M11 450E Plus with an Allison HD 4060 Transmission. The concern I have is that the side hydraulic cooling fans run at all times. I have asked a reputable diesel mechanic about this and he told me it was for the intercooler more than the radiators. Just wondering if anyone else has info on this matter? I have read on this forum that other owners have had their fan controllers go bad and their fans would run all the time and drop their fuel mileage 2mpg. If it is for the intercooler so be it and I will leave it alone,,,,


The coach is a 1996 Monaco Signature on a R3500S Roadmaster chassis,,,


joe
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Old 06-08-2013, 05:44 AM   #2
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My father had problems with the fan kicking on high speed when the temperature was to low. In his case the control was shot and the default is high to protect the engine from over heat.
Some of the hydraulic pumps can draw 70 hp, so yes there is a mpg hit.
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Old 06-08-2013, 07:35 AM   #3
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try the easy fix first. Make sure your electrical connections to the controler are thight. From what I've read on the subject a controler with parts and labor runs about $700. If you're taking a 2 mpg hit (that might be a bit high) fixing it will pay ou back pretty quickly with fuel at $4/gal. The thing I don't like is when you pull into a campground and it is all dusty you fill the air with dust.
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Old 06-08-2013, 07:36 AM   #4
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Investigated my unit and seems the same as yours. The situation appears to be 'built that way' on my unit. There is no conroller on the fan hub, just hyd hoses. There are two heavy electrical wires near the the control box but they are factory capped (dead ends) It is my understanding that temprature sensing fan hyd. conrollers are an option at time of purchase and can be retro fitted, but when not installed the default is to 'run all the time' Hope this helps, Good luck.
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Old 06-08-2013, 08:02 AM   #5
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I had the two wires going to the control switch on the hydrolic motor corrode and was not making a connection. Killed my power and my MPG. Cut out the weather-pack connecter and soldered and shrink wrapped the wires, no more problem.
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Old 06-08-2013, 08:05 AM   #6
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Are you saying that the side hydraulic fan runs WAO all the time right after starting the engine?

If so, then it's possible that your fan controller has failed.

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Old 06-08-2013, 10:40 AM   #7
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Originally Posted by 336muffin View Post
I had the two wires going to the control switch on the hydrolic motor corrode and was not making a connection. Killed my power and my MPG. Cut out the weather-pack connecter and soldered and shrink wrapped the wires, no more problem.


Was this drop in power and MPG because the intercooler had no air flow?
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Old 06-08-2013, 10:42 AM   #8
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Are you saying that the side hydraulic fan runs WAO all the time right after starting the engine?

If so, then it's possible that your fan controller has failed.

Dr4Film ----- Richard

The fans run wide open at all times. Seems wrong. But I have been told this is the design from Cummins,,,


?? joe
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Old 06-08-2013, 10:44 AM   #9
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Investigated my unit and seems the same as yours. The situation appears to be 'built that way' on my unit. There is no conroller on the fan hub, just hyd hoses. There are two heavy electrical wires near the the control box but they are factory capped (dead ends) It is my understanding that temprature sensing fan hyd. conrollers are an option at time of purchase and can be retro fitted, but when not installed the default is to 'run all the time' Hope this helps, Good luck.

What engine and year?
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Old 06-08-2013, 06:12 PM   #10
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Nope, it's not normal in any way shape or form.

Your fan controller is shot and needs to be replaced. If you don't have a fan controller then I guess it is WAO all the time.

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Old 06-09-2013, 06:44 AM   #11
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Nope, it's not normal in any way shape or form.

Your fan controller is shot and needs to be replaced. If you don't have a fan controller then I guess it is WAO all the time.

Dr4Film ----- Richard
Do you have a guess on the location?
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Old 06-09-2013, 07:28 AM   #12
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I have a 2000 500 ISM I just looked and off hydro pump I have two wires that are capped and no wires on fan hub. Does this mean I don't have a fan controller? Where would the controller be located? And does it use the two wires from the pump as control?
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Old 06-09-2013, 07:43 AM   #13
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Your best source of information is to call Source Engineering in Oregon and talk to them about fan type, controller and location if in fact there is one on your setup.

Source Engineering Inc.

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Old 06-09-2013, 10:57 PM   #14
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Quote:
Originally Posted by joeplazek View Post
I have a 1996 Cummins M11 450E Plus with an Allison HD 4060 Transmission. The concern I have is that the side hydraulic cooling fans run at all times. I have asked a reputable diesel mechanic about this and he told me it was for the intercooler more than the radiators. Just wondering if anyone else has info on this matter? I have read on this forum that other owners have had their fan controllers go bad and their fans would run all the time and drop their fuel mileage 2mpg. If it is for the intercooler so be it and I will leave it alone,,,,


The coach is a 1996 Monaco Signature on a R3500S Roadmaster chassis,,,


joe
Is the coach new to you or has it just start doing it? If you have owned it for a while and just started running on high. You either have a bad connection or a bad controller.

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