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Fan Controller test

Yahoo Message Number: 102744
Can somebody please send me the voltage testing specs and procedures for the fan controller with its own coolant and air sensors? Mine is malfunctioning, but it's weird. Clearly  most of the time it's locked on high while driving with the engine at operating temperature, but then it will go back to normal for a little while. I started the engine from cold this morning and expected to see the fan running on high but it was running on low speed perfectly, so I doubt it's a failed controller. Perhaps a bad sensor or dirty contacts at the connectors? Rich 2002 Magna

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Re: Fan Controller test

Reply #1 –
Yahoo Message Number: 102751
Hey Rich--

After dealing with this issue for many years, I know a little about the fan controller. At this point impossible to rule out anything. I don't know what controller you have, I have a 2007 CC with a CAT C-13 engine that used a Sauer Danfoss  1091243. If you have that controller (and maybe other controllers) it is very important to know that CC re-programed those controllers to put out 1.2 amps. They come from the factory set at 700 Milliamps, not enough to drive the solenoid, so if you get a new controller check to see what the output should be for your coach and what the output is of your new controller. If different, you will have to send it to Danfoss to be re-programed. Keep my name and if you end up doing that contact me and I will tell you the best way to get that done.

Because you are getting mixed fan speeds, I wonder if it might be the trinary AC switch. I am working with the same issue now having replaced the controller and one sensor to no avail. At this point I don't know the procedure for checking the trinary switch. I think it operates differently in terms of output than the other two sensors. If you find out let me know and i will investigate after the weekend.

Someone had posted some procedures for testing on a CC forum, but I can't find it now.

Pete

2007 Intrigue.

attached sensor data

Re: Fan Controller test

Reply #2 –
Yahoo Message Number: 102758
Rich,

Intermittent failure is pretty typical for the fan controller. Keep in mind that, with your Magna, as soon as you turn on the chassis A/C with the rear evaporator and fan on the fan will default to high.

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298

Re: Fan Controller test

Reply #3 –
Yahoo Message Number: 102785
Hi George:

I noticed you comment about the rear evaporator and fan on the OTR A/C in the Magna.  Does the rear work automatically or is there another switch to activate it?  I've driven my Magna 20K miles and never could figure out if I have the rear fan, and if so, how to activate it.

Thanks,m
Dave Glen

'06 magna 6591
 

Re: Fan Controller test

Reply #4 –
Yahoo Message Number: 102791
Dave,

My 2003 Magna has a switch in the bedroom for high, off and low. It works only when the dash air conditioner is activated at the front. In other words, it comes on in unison with the front A/C.

You may have that same switch in your '06 or you may have a switch for it at the dash. The dash location is better that the bedroom location as I have to ask my wife to go crawl over the bed to turn it on while we are under way. I suggest that you look closely at all of your rear switches and all your dash switches for the right one. Another '06 Magna or Affinity owner should know the answer to this for you.

Your evaporator should be under your bed with a black air duct aimed forward.

We just drove home from Santa Fe through TX, OK, AR, MS and AL heat. With front and back on Jan had to cover herself with a blanket. This is the biggest reason I went from my Allure to the Magna a few years ago.

Good luck

George in Birmingham
'03 Magna 6298
George in Birmingham
2003 Magna 6298