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Old 10-16-2013, 11:23 AM   #1
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Engine fan dust storm

I am new to this site, looks like a good place for RV information. I have a 1999 Country Coach with a 330 Cummins. My engine fan is almost always engaged, when I drive on the gravel roads in the camp ground I make a huge dust storm. I had it serviced at Cummins southeast, they checked with C/C and were told the fan runs at 1500 rpm at its lowest, which they said mine was reading, so should be working correct, I've never had this with other diesel coaches I've had and have not seen other coaches do this, is this a Country Coach thing, this is the only thing I dislike with this coach. I appreciate any input, thanks Larry
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Old 10-16-2013, 11:40 AM   #2
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engine fan dust storm

I posted but don't know where the post went, I'm trying again, I'll elaborate if this works
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Old 10-16-2013, 11:48 AM   #3
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yes it worked, whats the ?
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Old 10-16-2013, 12:39 PM   #4
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That's the way my Tiffin Allegro Bus works. I can tell by the engine temp when the fan shifts to high by the drop in coolant temp.
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Old 10-16-2013, 05:38 PM   #5
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When this dust storm occurs, do you have the dash air controls set to either "vent" or AC? Having either of these turned on will cause the fan to run at a higher RPM.

I don't know what the correct RPM is supposed to be at idle but a quick test is to have the engine at operationg temp with all the climate controls shut off. The hold a piece of 8x11 sheet of paper up against the grill. If the paper stays, the fan is running at high RPM.

One more question. What is your operating temperature while driving down the road? Should be in the 195 range.
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Old 10-16-2013, 05:55 PM   #6
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My Allure does the same thing. The fan seems to have two speeds, fast and really fast .

It will kick up the dust for sure.
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Old 10-16-2013, 09:26 PM   #7
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Just reading this makes me laugh just a little. When I first got our coach four years ago we were down in El Centro California in the desert and I was slowly driving through the RV park. I could see people in my rear view mirror who looked like they were in a dust storm cloud. When we replaced the fan speed controller things got much better. My fan really does not kick on now till the motor is hot.
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Old 10-17-2013, 07:42 AM   #8
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Quote:
Originally Posted by dons2346 View Post
When this dust storm occurs, do you have the dash air controls set to either "vent" or AC? Having either of these turned on will cause the fan to run at a higher RPM.

I don't know what the correct RPM is supposed to be at idle but a quick test is to have the engine at operationg temp with all the climate controls shut off. The hold a piece of 8x11 sheet of paper up against the grill. If the paper stays, the fan is running at high RPM.

One more question. What is your operating temperature while driving down the road? Should be in the 195 range.
Thanks for your reply, my dash air doesn't work so it is never on, the vent might have been on sometimes but it is usually off. My high running temp is 180, but this dust storm happens even in the morning when leaving the campground, I fell bad for the people I dust and my coach gets dirty, my battery area is always covered in dust
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Old 10-17-2013, 07:54 AM   #9
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Just reading this makes me laugh just a little. When I first got our coach four years ago we were down in El Centro California in the desert and I was slowly driving through the RV park. I could see people in my rear view mirror who looked like they were in a dust storm cloud. When we replaced the fan speed controller things got much better. My fan really does not kick on now till the motor is hot.
Thank you for your input, this might be the answer. I talked with Alliance Coach in Wildwood FL, they suggested I find as much info on forums like this to help them to fix it without hours "$" of research on their part, as there are many different setups on the fans. I had Cummins look at it but they not of much use, they said it was the RV end problem. Was it an RV repair facility, dealer or Cummins that replaced this controller for you. Thanks again, Larry
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Old 10-17-2013, 08:00 AM   #10
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Quote:
Originally Posted by allure99 View Post
Thank you for your input, this might be the answer. I talked with Alliance Coach in Wildwood FL, they suggested I find as much info on forums like this to help them to fix it without hours "$" of research on their part, as there are many different setups on the fans. I had Cummins look at it but they not of much use, they said it was the RV end problem. Was it an RV repair facility, dealer or Cummins that replaced this controller for you. Thanks again, Larry

While I really like my local Cummins Coach Care facility, I got the same response when I asked them to check and see if my fan was working correctly. I thought it would just idle slowly until the engine ECM called for more cooling. They just stood there looking perplexed and suggested I speak to Country Coach.

When we head out West next spring, we plan to visit either CC or one of the other suggested shops in Oregon who do a lot of CC work and ask them to check. Mine does not have the odd and hard-to-find Sauer Danfoss controller but another equally odd gizmo on the fan motor.
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Old 10-17-2013, 08:10 AM   #11
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sounds to me like you either have a bad fan controller or stuck proportioning valve,
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Old 10-17-2013, 10:37 AM   #12
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Some of the CC Owners several years ago were constructing a Fan Shroud that would redirect some of the air and reduce the dust storm effect.

You might try searching the CC Owners yahoo site for the words Dust Storm and also look in the photo archive for examples of the shroud.

I have not read about the problem much in recent years.
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Old 10-17-2013, 11:03 AM   #13
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Larry,
There are many posts about the fan controller and here is one link..
Yahoo! Groups
If you send me your e-mail address I can send you a PDF on the testing procedure.
I replaced mine on my previous 05 CC Inspire and it made a big difference.
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Old 10-17-2013, 11:27 AM   #14
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Larry,

We found out about the broken fan speed controler when we visited the Country Coach factory. They pointed out that it was not working right. They did not have the part at the time, but ordered it and sent it to a local shop in our area. Since we replaced it a couple of years ago the problem of the fan running at high speed only happens when it is hot. And since we had our radiator cleaned inside and out our coach never overheats any more.

My additional comment would be to find a Cummins shop that is proactive. The CAT place we used in Bakersfield CA last time really knew what they were doing. I am going to go out of my way to use them next time I need them. It is Quinn Power Systems in Bakersfield. They are a very good outfit. But you are Cummins so you need to find one of those guys.
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