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SID 33 Error Code Fan Clutch Output Device

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Jeff Lynn:
My 2006 Beaver Patriot Thunder with C-13 engine is throwing an error code when I climb hills. The code I pulled with SID 33 Fan Clutch Output Device. I have a side radiator with a hydraulic cooling fan. My motor doesn't come close to running hot so I'm not concerned about overheating, but I would like to solve this check engine issue.  Thanks for any guidance.

Steve Huber:
Jeff,
My guess is that the hydraulic fan clutch is not kicking the fan into high speed mode when hill climbing. More info may be in your C13 engine manual or a call/visit to a CAT shop may provide more info. You may also be able to check the fan operation by idling the engine. The fan should be running at low speed. Then block the radiator with a piece of cardboard, etc and as the engine temp increases the fan speed should increase.
All that said, it also may be that your fan is stuck in high speed mode. That would explain the lower temp readings climbing hills. But then it's not clear why it throws the code.
Steve

Jeff Lynn:
Steve,
  Thank you for taking time to respond.  I just learned that I had a hydraulic fan. That is a new concept to me. I am going to go coach next weekend an search for the wiring to the fan and the PTO. I'm sure I will end up taking my rig to a CAT shop.

Jeff

Steve Huber:
A search for "Hydraulic fan" here on the Forum will yield more info about the system.
Steve

Frank Bergamo:
I belief your coach has a Wax Valve controlling your cooling fan. No electronics involved, all hydraulic. It will be located inside the rear engine compartment, to the left, screwed into the radiator. It will have two smaller hydraulic lines connected to it. Search “Thermal Wax Valve” for info. As far as your error code, have no idea what that would be. Hope this helps!

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