My friend has a 2001 Numar Mountain Air Motor home built on a Spartan chassis. Powered by a 8.3L Cummins ISC, 350 HP Diesel engine. His Radiator Fan is operated by a continuously running hydraulic motor powered by the Power Steering pump.
He says that he saw an advertisement for a kit or retro fit unit that operates the fan thermostatically only when needed, now that he is planning on doing some work on the MH he can’t find the information. Is anybody here on RV.net familiar with this?
2005 Dodge/Cummins auto, 2wd. PacBrake PRXB Exh Brake, Maxx Brake controller.
1998 Hitchhiker II, mod#31RLBGBW, RBW L'tl Rocker Hitch, Generac NP50 G generator. Dexter EZ lube 7,000# axles with 8,000# capacity brakes.
Think you are talking about a Horton Clutch Fan - we had one installed about 18 months ago. We get about 1/2 MPG better fuel consumption plus it is a lot quieter when hooking up the toad. Search here and you will find other posts about it.
Dave & Kathy
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The Horton fan clutch is for a REAR radiator coach, not side as the OP has.
There are several different methods of doing what the OP desires-- reducing HP demand of the hydraulic system when all that CFM is not needed.
Simplest is to install an adjustable controller. Then, pump PSI to the fan motors can be adjusted. Lower PSI= lower HP demand. Very simple and can be adjusted in less than one minute. I have this system on my coach.I have a winter and summer setting because of differing cooling needs. VERY KISS.
There are electric controllers-- most are two speed, though you may find one that is variable. They get their temperature signals from different inputs. Older engines have a separate temp sensor installed in the upper radiator hose. Newer engines get the signal from the engine ECM.
My suggestion is to either get specific information on systems that have been used on your chassis from your chassis maker, an owners group for that chassis or find a coach with a drivetrain of the same vintage that does have a controller on it OR go KISS theory and just put an adjustable controller on it.
* This post was
edited 10/24/10 11:52am by wolfe10 *