rvndonbon

Thank you Brett, I have read about this system in the past but am trying to make sure it's my controller before I spend the money to replace it. My fan seems to run quite fast when I start the engine and it's cold but slows down when the engine is at normal operating temperature. I know the fan defaults to high speed if controller is not working at all but what will it do if the controller is defective or is that not possible?

I have a 2001 National RV Tradewinds LTC with a side radiator with a Sauer Danfoss Hydraulic fan system.

What is the easiest way to determine if the hydraulic fan controller is working properly? When I start my motorhome when engine is not hot radiator fan seems to run fast. After engine warms fan slows down. Could this indicate a problem with the controller?

When I change my engine oil on my Cat 3126 B the level of the oil in the old filter is down about two to three inches, not full, is this normal? Thanks

This sounds like something to consider on my motorhome since I have one grill low on the back that is only 9"X48" and one on the acess door half way up that is 8"X48" and that means I only have about 6 sq.ft. of grill area. I might try first to leave the 2'X4' acess door open and see if there is a change in the overheating problem. Before I remove the flap I might try to bend it up to see if that helps. Thanks for the ideas! Don

Brett, Thanks for the reply! I always do the sandwich from both sides and between layers using Dawn and lots of water but never have opened the sandwich. You mention the fan hydraulic controller could be a problem. I guess the only way to tell if the fan controller is working properly without test equipment is by sound of the fan when engine is hot or cold. I notice that my fan is very loud and feels like its moving lots of air when engine first starts and is cold. After it warms up the sound seems to be a lot less as well as air flow. This has always happened. I never have listened to the fan when the engine is overheating, maybe I should or maybe I should take it to a repair facility and have it checked. Thanks again for your thoughts and advice. Don M

I have done all of this to my motorhome: clean radiator, new regulators, new ELC, new coolant hoses and I always maintain RPMs around 2000-2200. However, when climbing long steep grades on warm days my engine will overheat. I have a Cat 3126B-330HP with side radiator. I have been considering the use of somekind of water mist system to help cool the radiator. Has anyone had any experience or thoughts on such a system?

Thanks for the quick response! I wish we could have attended the rally. The info one can get at the rally is always helpful. Don

I frequently read the importance of cleaning the rear radiator and the proper way to do the cleaning. However, I have a side radiator and would like to know the proper way to clean the radiator and other coolers. Should one separate the group to clean? Thanks for any tips! Don