[T3] Blower Motor

[William J]

The switch actually burnt . I can see the black contact and loose male plug 
on the low speed . It melted.
----- Original Message ----- 
From: "Jim Adney" <jadney at VWType3.org>
To: <type3 at vwtype3.org>
Sent: Thursday, December 08, 2016 1:10 PM
Subject: Re: [T3] Blower Motor


> On 8 Dec 2016 at 12:34, William J wrote:
>
>> Guess I was wrong. I looked at the Bentley and it shows what looks like a
>> capacitor and something that may be a resistor both on the low speed 
>> circuit
>> and only one winding.
>
> Yes, that's a capacitor, which would have been for electrical noise
> reduction, to reduce radio interference. I don't recall seeing that,
> so I don't know where it is or even if it's really there.
>
> Yes, that's the resistor, only in the '73 schematic. It's just in the
> low speed circuit. The high speed circuit bypasses the resistor.
> IIRC, the resistor is hard to get to. I THINK you have to pull off
> the fan blade and it's under there. My impression is that it doesn't
> get enough cooling, so that's why it dies. There's actually a VW part
> number for that resistor and I actually have one, but I replaced mine
> with an Ohmite brown devil, perhaps 1 Ohm. That lasted quite a few
> years and then also failed. I've ignored it since then.
>
> I don't know why the low speed contact on a switch would fail. Is it
> possible that your resistor had failed, making your low speed no
> longer functional (like mine.) If you had blamed that on the switch,
> replacing the switch would have made no improvement.
>
> In any case, the better repair is to swap in an earlier fan and box.
> There were multiple changes done in '73, and each of them makes the
> earlier boxes more reliable. Anyone who does this should pull it all
> apart, clean it out and lubricate the fan motor bearings.
>
>
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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