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Old 12-15-2017, 03:02 PM   #1
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I have a 2005 Monaco Windsor 38PDQ, Cummins 400 ISL

Can someone explain the cycle for the radiator fan, when it goes to high speed, etc. Mine goes high speed at about 200 degrees, engine cools down and about 175 degrees goes to high speed again. These cooler mornings, it will run a long time in slower speeds until temp hits 200. Engine temp runs 195+/- 3 degrees until I go up a grade or slow down in traffic, then it will get to 200+ and go to fast speed. Is this norma?
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Old 12-15-2017, 03:18 PM   #2
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Temp seems a little high in traffic especially this time of year.
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Old 12-15-2017, 03:26 PM   #3
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195 thermostat is working....fan is cycling properly. You are right at design temps. Someone else (and yours) will always vary based on speed, loads, incline, elevation, how clean the radiator is...AND personal driving habits.

Sounds good to me.

When pulling hard keep rpms about 1900-2000 to keep coolant moving for optimum cooling. Don't be afraid to shift down to obtain that that rpm.
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Old 12-15-2017, 04:20 PM   #4
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Thanks for input. A year ago, the fan would go to high speed as soon as I started the engine. Ages months ago , it started running as I described. Don't know what changed, but no it is running as it is supposed to, I am thinking
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Old 12-15-2017, 07:39 PM   #5
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When we first got our couch 4 years age my fan would go to high around 204deg then cut off around 192deg on my Silverleaf. Then last year the temps went up to 210deg before the fan would come on then off around 194. The Sourer-Danfoss hydraulic fan controllers are know to fail and when they do it should default to high. So I went with the wax valve, now when it kicks in the temp drop down the 174deg and comes on at 200deg.
You could pull the wires at the controller and clean them and apply Dielectric Grease
https://www.ecstuning.com/b-permatex...All%20Products
Wax Valve
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Old 12-15-2017, 07:49 PM   #6
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TGibbons, it sounds like your Sauer-Danfoss fan controller might be the problem and will likely go into the fail mode (full speed) at some point. If that is the case, a replacement is required. That unit is controled from the engine CPU.
Some have used a Wax valve replacement from Source Engineering.
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Old 12-15-2017, 08:18 PM   #7
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When and if it goes into fail safe/full speed all the time then you need a fix. Temp will stay around 175-180 mileage will go way down, fan noise increases.

THEN...you need the wax valve fix. Again for now you are good.
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Old 12-16-2017, 08:11 AM   #8
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From what I am hearing, it is working the way it is supposed to. Thanks for the input to all
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Old 12-18-2017, 06:52 PM   #9
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fan

Interest post, just wondering how do you know what the fan is doing and the temps? Can you use the Silver Leaf?
Thanks
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Old 12-18-2017, 09:52 PM   #10
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Quote:
Originally Posted by maxwell18 View Post
Interest post, just wondering how do you know what the fan is doing and the temps? Can you use the Silver Leaf?
Thanks
Yes I see the coolant temp on my SilverLeaf coming off my ECM plus I can hear the fan start and stop going down the road. The only thing I have to remember is to turn off my AC so at startup there is no head pressure on the AC. After a few minutes I can turn it on.
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Old 12-19-2017, 07:30 AM   #11
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Another post with good intentions from a non-Monaco owner confuses the issue.

Monaco does not program the a/c off function in the SD controller...that is a Country Coach feature.

The temps can be observed on Monaco's Aladdin monitoring system....or if some one has added Silverleaf monitoring. I suppose you can see the temp changes on the dash gauges, but you will only see movement, not actual temps.
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Old 12-19-2017, 07:43 AM   #12
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I watch temp gages on dash of and the Aladdin. The Aladdin, I feel is more accurate. These two readouts let me know when the fan goes to high speed, as temp drops immediately
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Old 12-19-2017, 08:22 AM   #13
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Sounds normal as I observe the same on my 05 Dip with the same engine....
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Old 12-20-2017, 05:49 AM   #14
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I have the same year Windsor as TGibbons, and I make this post to reinforce what Twomed and 2 Stroker have made (read their comments in this tread) on the fact that Monaco did not program the controller to activate the fan when the AC is on. This running of the AC without the fan on can cause high pressure when idling (or cold start), which will kill the compressor. It happened to me.
The alternative is to turn AC off when you cold start or idling in traffic. No fan is Bad!
I am in the process of adding a 12" auxiliary cooling fan to outside of the condenser, just inside the grill. It will get its signal to run from the compressor clutch wire, so it will keep good air flow going anytime the AC runs. I have a friend who has used this setup for 5 years now and the head pressure is very good - cold air too!
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