[doc] Re: Very Strange - my blower fan quit working completely - UPDATE

["lakelanier20" <derek4567@xxxxxxxxxxx>]

Hello again,
    I just wanted to give you guys an update on this.  After 
following all of your suggestions, and trying a couple more things, 
I just couldn't determine what was wrong.  I had a knowledgeable 
friend come over and do a bunch of electrical tests, and just when 
we were about to call it quits, he checked the mode switch itself, 
and guess what.... that was the problem all along.  Even though my 
repair inside the switch still looked exactly as it did when I re-
installed it and it worked fine for a little while, apparently there 
was something about it that the car didn't like.  So I gave in and 
ordered a new one and everything works great now.

Many thanks for your responses on this list.  I posted the question 
on 4 different forums, and on 2 of them got ZERO responses.  Nice.  
By far the most replies came from here, so now I know where 
the "friendlies" are for future reference.  :)

-Derek L
VIN 5302





--- In doc-uk@xxxxxxxxxxxxxxx, "lakelanier20" <derek4567@...> wrote:
>
> Hello, my name is Derek, and I while I've been a member of this 
list for some time, I don't think I've posted here before.  Just 
trying to get my question to as big of an audience as possible for 
this one...
> 
> Here's a problem that has got me stumped.  (sort of lengthy 
> description, but please bear with me)  
> 
> Background story:
> Ever since I've had my car, the interior blower fan would quit 
> running when the mode switch was turned to heater or defrost (top 
2 
> positions on mode switch).  Last week I finally decided to tackle 
> the problem, and pulled back the center console and took out the 
> mode switch.  Turns out that at some point, the outer metal "rail" 
> inside the switch had melted down into the plastic, so that as the 
> dial was turned up to heater and defrost, the nub on the contact 
> plate no longer touched the metal rail, which fed the green fan 
> wire.  Simple enough, so I raised up the rail, installed 
everything back in, and the fan then worked in all positions.  A 
happy camper I was.
> 
> So that evening, I go for a drive, 15 minutes to a store, running 
> the heater.  No problems.  Half way home, I sat idling outside 
> another store for about 15 minutes while a friend went inside.  
> During that time, I heard a faint "sizzling" noise from the relay 
> compartment, but it was so faint, that I questioned whether I 
really heard it and there were no noticeable symptoms, so I sort of 
> shrugged and didn't think much of it.  By the time I got home, I 
> realized that the blower fan had quit working on ALL positions of 
> the mode switch.  
> 
> So here's where I'm at now.  The circuit breaker for the blower 
fan seems fine (multi meter shows power on top and bottom contacts), 
the 3rd and 4th fan speed relays test ok for continuity (although 
I'm no expert on what to look for) and nothing looks even slightly 
melted or burned up.  I replaced all fuses.  I made sure the fan 
speed switch is securely connected.  The resistor behind the fan 
itself is brand new and securely connected.  And of course my repair 
in the mode switch still looks good.  Everything seems fine.
> 
The blower motor still works, because when hooking up a separate 12V 
> battery directly to the contacts on the motor, it comes right on.  
> When hooking up my multi-meter to the pink/red wire going to the 
> motor, it shows the following:
> 
> Fan speed switch positions:
> Off :    0 volts
> 1:       11.75 volts
> 2:       11.75 volts
> 3:       0 volts
> 4:       0 volts
> 
> Despite positions 1 and 2 showing voltage, the fan never comes on.
> I have looked at the wiring schematic on page M:18:19 of the 
> workshop manual, but unfortunately with my level of expertise, 
most of it is Greek to me.  If anyone can lend me some advice it 
would be very much appreciated, because the only thing I know to do 
from here is to try putting in new parts (relays, circuit breaker, 
fan speed switch? etc).
> 
> Thanks in advance,
> -Derek L
> VIN 5302
>






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