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Old 04-21-2012, 11:38 AM   #1
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Cockpit Fans

I have an 08 Allegro Bus. The two cooling fans mounted high on the left and right side of the wind screen are controlled by three position switches. They should be low, off, and high. The fans will not operate in "low". Any ideas?
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Old 04-21-2012, 11:48 AM   #2
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Did they ever work on low?

Switch could be bad. Pull from dash and use 'jumper wire' to bridge connector between low position and 12v. If fan operates, its the switch. If fan doesn't operate, its the wiring or the fan.
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Old 04-21-2012, 12:39 PM   #3
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You may have to get wiring info from Tiffin, as some newer vehicles use a variable resistance to ground rather than reduced power feed for speed control. You will need to know the location of the resistor in eigther case, it could be internal in the switch, or remote in the under dash area as it gets very hot on the lower settings .
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Old 04-21-2012, 01:05 PM   #4
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Just purchased the bus so I do not know if they ever worked. Two fans, two switches and neither work on in the low position.
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Old 04-21-2012, 01:32 PM   #5
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Skip426 is probably right, it sounds like the low speed resistor is bad. Now you have to find it. Try to follow the wires from the switch.
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Old 04-21-2012, 01:56 PM   #6
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How many wires come out of the fan motor itself?
If 2 wires then there are resistors as its a single speed motor.
If 3 wires you have a 2-speed fan motor.
If 4 wires you have a 3 speed fan motor.
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Old 04-21-2012, 02:19 PM   #7
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Three (3) wires come out of the fan motor itself.
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Old 04-21-2012, 03:31 PM   #8
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I have had three MH all with these fans and don't recall ever having them on. Having said that we live in Florida so maybe they are more useful in colder climate ?
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Old 04-21-2012, 04:11 PM   #9
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Quote:
Originally Posted by ajrohde View Post
Just purchased the bus so I do not know if they ever worked. Two fans, two switches and neither work on in the low position.
as ottffss,and other posters, say this may be a case of could never have worked. you may have a 2 speed fan hooked to a 3 spd switch . Don't overlook that possibility.
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Old 04-21-2012, 11:45 PM   #10
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as ottffss,and other posters, say this may be a case of could never have worked. you may have a 2 speed fan hooked to a 3 spd switch . Don't overlook that possibility.
Seems most likely. With 3 wires you have a 2 speed motor (hi-lo-ground). I would be very surprised if there was a resistor added to the 3 speed switch to get 3 speeds out of that 2 speed motor.

Is there even a wire connected to the low speed position on the switch???
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