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Old 07-16-2015, 03:34 PM   #1
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Monaco Dynasty fan speed

I don't appear to be getting high fan speed on my 01' Dynasty with side mount radiator and its causing a hot running condition. Has anyone ran into this?
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Old 07-16-2015, 05:34 PM   #2
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Do a search for Wax Valve.

The speed of the fan is controlled by a wax valve, when the coolant gets hot the wax valve allows more hydraulic fluid to the motor and either opens a port there or simply supplies more oil.

There have been several recent posts.

Here is a parts page for my coach which is probably set up just like yours, the thermo valve is located on the radiator, top left corner looking from underneath, it has 2 small hydraulic lines running to it.

The valve is listed as the Thermo Valve B5531-09857-210, it is not shown on the picture. Do a search for this on IRV2, I read one a while back that had a source out of UK for ~$250. Do some searches on the Wax valve on IRV2 and you'll find more info.
Attached Files
File Type: pdf 1 Engine Fan Cooling.pdf (78.4 KB, 67 views)
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Old 07-17-2015, 08:46 AM   #3
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Yes, I believe I have/had the same problem in my '98 Exec. I had elevated temps the whole two weeks that I was on vacation but upon return, I went to drive it to my mechanic and couldn't duplicate the problem. I suspect that it started running the high speed OK now. I don't trust it anymore but don't want to replace that $$$$$$$$$$$$ part for no positive reason.
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Old 07-17-2015, 09:02 AM   #4
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Here is a quick test to see if the wax valve is working. First before you remove either of the -6 hydraulic lines from the wax valve you need to mark them as to which one goes on which fitting. Not sure what the size of the hoses are, I can't remember but you need three fittings to test the fan. You need two block offs that you can put on the ends of both hoses and a joiner to join the two lines together. If you mark and then pull off both hoses and install plugs in the hoses stopping flow then the fan should run at max speed. Then take the plugs out and join the two hoses together and the fan will run at slow speed. If that works both those ways then the problem is in the wax valve. If the fan doesn't change speed then the problem is in the fan controller.
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