fresh air fan bad resistor?, defrost fresh air Options

[Medtner3]

update: well, the fan was working now not even that is working. I think I might have fried the motor when I was hooking up the leads to test the fan through the resistor prongs I accidentally let the pos and neg cross ... when it rains it pours not going well today

Edited: I took my fresh air box fan out of the car and tested with a 12 V battery and it spins and works. But the resistor does not seem to work: I put 12V positive lead on the upper right pole where power comes in ( I get 11.84 volts on this terminal when the ignition was on) . ... as I understand it the other three poles are ground for the three fan speeds? So I connect each one to ground and the fan does not work

assuming I am testing correctly>>>> can you rebuild a resistor or perhaps clean it with contact cleaner and make it work again

https://forums.pelicanparts.com/porsche-911...ower-motor.html

https://forums.pelicanparts.com/porsche-914...roster-fan.html

[DRPHIL914]

Found the thread Drphil914 started.

Might have some info that will help you. Also has info on my motor (couldn't be fixed) and the URO replacment.

Also don't forget while you're in there, 914Rubber sells new gaskets and seals, and hardware to completely rebuild the fresh air box if you're in need.


http://www.914world.com/bbs2/index.php?sho...=351152&st=

Found the thread Drphil914 started.

Might have some info that will help you. Also has info on my motor (couldn't be fixed) and the URO replacment.

Also don't forget while you're in there, 914Rubber sells new gaskets and seals, and hardware to completely rebuild the fresh air box if you're in need.


http://www.914world.com/bbs2/index.php?sho...=351152&st=

I got all that the only thing I need is the rubber grommet where the wires go into the fresh air housing. I will definitely check out that thread . Tested my motor again this am and it briefly worked but I smell burning plastic ... not good so jerked the wires off.

I separated the motor from the fan which was very tricky used a hammer and punch and emory cloth around the impeller. Actually managed to remove the motor without breaking the fan.

the part of the motor that touches the brushes looks terrible. sanded it a little and got it to spin for a few seconds then stops.

Not wasting anymore time on this I am replacing the motor since does not really look rebuildable

Found the thread Drphil914 started.

Might have some info that will help you. Also has info on my motor (couldn't be fixed) and the URO replacment.

Also don't forget while you're in there, 914Rubber sells new gaskets and seals, and hardware to completely rebuild the fresh air box if you're in need.


http://www.914world.com/bbs2/index.php?sho...=351152&st=

I got all that the only thing I need is the rubber grommet where the wires go into the fresh air housing. I will definitely check out that thread . Tested my motor again this am and it briefly worked but I smell burning plastic ... not good so jerked the wires off.

I separated the motor from the fan which was very tricky used a hammer and punch and emory cloth around the impeller. Actually managed to remove the motor without breaking the fan.

the part of the motor that touches the brushes looks terrible. sanded it a little and got it to spin for a few seconds then stops.

Not wasting anymore time on this I am replacing the motor since does not really look rebuildable

well I figured out one of the brushes was frozen and probably why the motor was not working right. tried to get the brush out and it broke in half

(IMG:style_emoticons/default/agree.gif) lots of sellers on ebay, they are all the same, URO fan/motor assembly is what you need, its all one piece , and under $100. Drew at URO confirmed for us that it is counter balanced too, and i believe there is a one or 2 year warranty on that.
I found that on mine a previous owner had it apart and had the wires crossed in the connector, so just make sure your ground pathways for the different speeds are in the correct location. you already confirmed you have power, and your old motor was the issue. get the new seal that goes on the fan( the fan to housing seal) that is new from 914rubber, they are the only one that makes it. That will keep it from dragging and causing resistance too.
My fan works like new and i am amazed at how much air they push!.
- also get the new cables too , it makes a huge difference on the operation of the controller/sliders.

Good luck,

Phil