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06-08-2013, 05:32 AM
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#1
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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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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06-08-2013, 05:44 AM
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#2
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Senior Member
Join Date: Aug 2011
Posts: 1,546
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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.
__________________
2017 F350 Lariat Diesel Dually, White, Hitch Kit.
2013 Dutchman Voltage 3200 Epic II 5th wheel.
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06-08-2013, 07:35 AM
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#3
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Senior Member
Country Coach Owners Club
Join Date: Jan 2011
Posts: 1,204
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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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06-08-2013, 07:36 AM
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#4
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Member
Join Date: Jun 2011
Posts: 38
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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.
__________________
held4ever
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06-08-2013, 08:02 AM
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#5
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Senior Member
Join Date: Apr 2011
Posts: 2,569
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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.
__________________
American Tradition 42R-Cadillac SRX Blue Ox Koni 5050XL MCD Scangauge D Samsung rf197
Fulltime since 2012
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06-08-2013, 08:05 AM
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#6
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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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
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06-08-2013, 10:40 AM
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#7
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Quote:
Originally Posted by 336muffin
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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Was this drop in power and MPG because the intercooler had no air flow?
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06-08-2013, 10:42 AM
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#8
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Quote:
Originally Posted by Dr4Film
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
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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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06-08-2013, 10:44 AM
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#9
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Quote:
Originally Posted by DieselOne
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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What engine and year?
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06-08-2013, 06:12 PM
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#10
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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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
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06-09-2013, 06:44 AM
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#11
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Senior Member
Join Date: Jul 2011
Location: CAISTOR CENTRE
Posts: 785
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Quote:
Originally Posted by Dr4Film
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
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Do you have a guess on the location?
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06-09-2013, 07:28 AM
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#12
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Member
Join Date: Jan 2013
Location: WV
Posts: 84
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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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06-09-2013, 07:43 AM
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#13
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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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.
Dr4Film ----- Richard
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06-09-2013, 10:57 PM
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#14
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,781
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Quote:
Originally Posted by joeplazek
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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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.
Chuck
__________________
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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