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Fan Controller (again)

Yahoo Message Number: 91921
We just got back from a trip to San Antonio (from Sedona, AZ). Everything worked fine, but on the way back the fan controller quit working and wen to high speed. This is a fairly new controller, I had it installed less than a year ago. It never worked like the original, which would cycle from 174 to 192 and back down again. The new one kept the temps in the 180 range and would cycle from low 180's to high 180's. But it seemed to work. Now, high speed all the time and dust storms in the parks. What a PIA. I am tempted to not replace it this time, as the mileage difference is less than 1 MPG and would take a lot of miles to break even, at $800 installed for a new one. The dust storms are more of a bother to me.

Al Colby

2000 Intrigue 10979

Re: Fan Controller (again)

Reply #1 –
Yahoo Message Number: 91922
Al:

Have you checked to make sure that your Coolant Temperature & Air Temperature Sensors are working properly?

Kevin Waite
541-953-6162

Re: Fan Controller (again)

Reply #2 –
Yahoo Message Number: 91924
Al, your coach probably has same setup as mine, the Air Sensor is mounted on the bottom of the air tube and this could be causing yours to fail as it acts as a cup to any moisture that might be in the air tube, I have had to replace my air sensor several times. Not too hard to replace, you can do it. I had to use a torch to heat up the sensor to loosen it but then it came right out. Not sure where you get the sensors at now, it has been a few years since I replaced mine.


Ray 2000 Intrigue 11040

Re: Fan Controller (again)

Reply #3 –
Yahoo Message Number: 91926
Al,

I was having some of the same issues you described. I took my coach to Premier Coach in Tucson thinking I would need to replace fan controller. After they diagnosed the problem they discovered the wiring needed to be re-secured and all was back to normal. Eric and Doug really have a good handle on what make these fan controllers work.


I would suggest you contact them and see if they can help or refer you to someone in your area that can help. 520-624-2024.


Jock Vargo

2005 Inspire
51428

Re: Fan Controller (again)

Reply #4 –
Yahoo Message Number: 91930
I had the same problem (wires) with mine. With engine at idle, fan speed was high on cold engine fan speed reduced when wiggling the wires. Wired-tied wires into position and fan controller seems about 75% better.

Larry 03 Allure 30856

Re: Fan Controller (again)

Reply #5 –
Yahoo Message Number: 91931
to elaborate a bit, the bad connection seemed to be inside the potting of the controller. I cleaned all external connectors, put problem was still there. The wire-tie seemed to work.

Re: Fan Controller (again)

Reply #6 –
Yahoo Message Number: 91938
Kevin,

I installed the new SD controller this week.
Actually was not that difficult to do.
Just getting to the two mounting bolts was tricky but a 3 " hole did the trick. Made a nice cover for the hole.
Fan still running high speed though.
Today wanted to replace the coolant sensor ( have a spare one on board, because they do fail), could not get it loose. Is soft material like copper, any idea ? Heat ? Hans

Magna 630

Re: Fan Controller (again)

Reply #7 –
Yahoo Message Number: 91939
My air sensor (pin E to pin F on the connector) reads open. Is this the failure mode for theses sensors? Will this cause high fan speed?

Al Colby Intrigue 10979

Re: Fan Controller (again)

Reply #8 –
Yahoo Message Number: 91940
Al, Short answer is no, an open sensor will not cause the fan to run at high speed. The resistance of these sensors go down as they heat up and open sensor will never have a low resistance. So, an open sensor will not cause the fan to go to any speed other than low.
Both of my sensors failed in the open mode.


pete 2000 40' Magna CAT C10, #5892
Pete
 2000 40'  Magna #5892  CAT C-10

Re: Fan Controller (again)

Reply #9 –
Yahoo Message Number: 91942
That shouldn't read open, it is possible that you have an open wire, assuming the sensor is good. Did you disconnect the wires at the sensor and check the resistance across the sensor? It should be 1.2k, if that checks good then check the wires to see if they show an open then connect one end of the two wires together and see that you get very low resistance, should be near zero resistance. This test will tell you if you have a wiring problem between the fan controller and the sensor and will also affirm the condition of the sensor. These tests plus remaining test procedures are in the File section under Fan. PDF

Ray 2000 Intrigue 11040

Re: Fan Controller (again)

Reply #10 –
Yahoo Message Number: 91943
Just an additional thought about the open condition, that is a failure of either the wires or the sensor. You might also want to make sure that the connectors on the wires are clean, use wire brush to clean them up, both ends, to assure that the wires have good conductivity.


Ray 2000 Intrigue 11040

Re: Fan Controller (again)

Reply #11 –
Yahoo Message Number: 91944
Al, The "E" to "F" pin measures your Engine Air Temp Sensor. With engine cold and ignition OFF, the Ohms between "E" & "F" should be between 1.2K to 3K Ohms. With engine at Operating Temperature should read @ 200 Ohms.
Your "C" to "D" pins measure Engine Coolant Temp Sensor with Engine Cold same readings as above and at Operating Temp should be 500 Ohms.

Thanks, Mike 03 Allure 1st Ave. #30898

Re: Fan Controller (again)

Reply #12 –
Yahoo Message Number: 91948
Al and others with fan controller problems. Contact John Davis at jdrv1@... or call him (541-306-6473 or 541-693-3016) to find out how to test your controller and sensors. You can buy new sensors from him. He is very knowledgeable about the system and has repaired/replaced many of them. The sensors are the problem much more often than the controllers. He is also outstanding at fixing most other problems on your coach.

Gene Merryman
2006 Intrigue
CC# 12005