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Old 07-23-2007, 08:06 AM   #1
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automatic ceiling fan problem

We have a 74 overlander with two ceiling fans, with automatic switch when cranked completely open. Both have worked, but worked sporadically. Where is the switch that starts these fans (or doesn't) and how does it work? Any other suggestions about what may cause them to work only occasionally? They're not noisy, or anything. And when they work, they work fine. Thanks
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Old 07-23-2007, 10:02 AM   #2
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more info might help such as the brand, number of switches and controls. is there a thermostat switch?
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Old 07-23-2007, 08:43 PM   #3
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I have no idea on brand, thermostat, etc. It is original equipment, not a fantastic fan or anything. Apparently from what iread, when it is cranked up completely, the fan should come on. sometimes it does, but mostly, it doesn't. Thanks for the attempt.
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Old 07-23-2007, 09:58 PM   #4
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Quote:
Originally Posted by tinsltootsie
I have no idea on brand, thermostat, etc. It is original equipment, not a fantastic fan or anything. Apparently from what iread, when it is cranked up completely, the fan should come on. sometimes it does, but mostly, it doesn't. Thanks for the attempt.
I just spent 10 minutes posting what the problem was and when I went to add pictures the post disappeared along with my pictures. Darn it! Let me try again and if it doesn't work then heck with it.
Pull the fuse which operates this circuit first.
1. Remove light switch knob by pulling down.
2. Remove nut on switch's shank.
3. Remove screw from vent handle and remove handle.
4. Remove 4 screws located at edge of center grill. I don't remember mine having these.
5. Lower shade.
6. Remove center screen, I think it has 2 screws. You should be able to reach the micro switch which operates the fan when the vent is almost fully open. Check to see if it sticks. It just might need some cleaning.
7. If you can't reach it, remove the 5 screws that secure the reflector plate to the multidome.
8. Disconnect light leads from harness at the quick disconnect connectors.
9. Lower plate assembly.
10. I don't think you have to remove the fan assembly if you have small hands.
11. Remove 2 oval head screws on body of micro switch which secure it to vent frame. Clean her up.
12. To adjust after putting the switch back in or replacing it, adjust switch's leaf by bending. Fan switch switch should "close" (turn fan on) when vent crank is approximately 1.2" from full open position.

Hope this helps.
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Old 07-23-2007, 10:05 PM   #5
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Oops, I just realized that I could see the micro switch from the top of the trailer but not from inside. To get to it from inside you must:

1. Remove rivets which secure the fan bracket to vent flange after lowering the reflector plate assembly.
2. Lower fan motor and shroad assembly.
3. Disconnect fan's wire leads from micro switch and harness at quick disconnect connectors.

You should then be able to get to the micro switch. Sorry for the confusion.
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Craig

AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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Old 07-25-2007, 08:27 PM   #6
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Wow! Very detailed! Thank you soooo much for your time. I will pass on to my husband, who is the one working on this. I'll let you know how we make out. Thanks again!
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Old 07-25-2007, 09:43 PM   #7
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You're welcome. I just knew that the huge dealer service manual would come in handy even after I sold the '77.
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AIR #0078
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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Old 07-28-2007, 02:34 PM   #8
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Motor

I just disected mine and the motor is wiped out. One of the brushes has hung and de-tempered the spring. Any ideas on where to get an OEM type motor? I dont want to spring for a fantastic vent and the powered shrouds don't look original.
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Old 07-28-2007, 06:49 PM   #9
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manual help

we bought the manual with ours, but I couldn't find any fan info. Maybe I will look again. But you are right, those manuals are very helpful.
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Old 07-30-2007, 09:44 PM   #10
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Quote:
Originally Posted by HiHoAgRV
I just disected mine and the motor is wiped out. One of the brushes has hung and de-tempered the spring. Any ideas on where to get an OEM type motor? I dont want to spring for a fantastic vent and the powered shrouds don't look original.
I think Andy at Inland RV has replacement motors.
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'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system
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