[Shotimes] Info On The Blower Control Module

[Carl Prochilo]

Joe,  You are the defacto expert on the BSC, so I bow to you.

I had reported a while back that I too got bitten by this problem. 
Interestly enough, the problem has not manifested itself recently.  When
it does happen, it's because the ambient temperature is very high.  95 or
higher.  So the problem appears to be heat related.

I picked up a used BSC recently.  In looking at the design, the part lives
in a hostile environment.  For instance, the circuity is air cooled by the
blower itself.  But because there is no air filter before the blower, crap
can get caught in the fins, minimizing the cooling efficiency of the heat
sink.  I'm tempted to pull the module anyway and give it a good cleaning
to make sure there are no obstructions.

If nothing else, it appears that this is just another part to add to the
list of items you'll eventually need to replace.
-- 
Cheers,
Carl Prochilo
92 Ultra Red Crimson - 201K

> The BSCM operates in two modes:  full-speed (such as when you press Max
> AC)
> and part-speed.  You have lost part-speed mode, so the module has "failed
> safe" in full-speed mode.
>
> Some modules fail this way because the full-speed-mode relay fails in the
> closed position.  (If you need a replacement relay, I can sell you an
> exact
> replacement for $12 plus shipping.)  It is also possible that other
> components in the part-speed circuit have failed.
>
> Your best bet is to replace the module.  I recommend you contact Al
> Fitzgerald at alfitz.com.  He sells them for $35 to $45 plus shipping.
>
> Joseph van Oss
>
>
> ----- Original Message -----
> From: "M. Khan" <eagle23@attcanada.net>
> To: <shotimes@autox.team.net>
> Sent: Monday, September 22, 2003 1:43 PM
> Subject: [Shotimes] Info On The Blower Control Module
>
>
> Hello everyone,
>
> I've been lurking on the list for a long time and now have a question
> regarding the blower control module.  Or at least I believe this is the
> problem.  On the 93, the ETAC fan will only operate at the highest
> speed on the wheel, you can roll it anywhere else and nothing happens.
> Same for the automatic mode.
>
> Does anyone know how to fix this, besides replacing the module, is
> there something on the circuit board that is worn out?  A resistor,
> capacitor, etc....
>
> Thanks,
>
> Mike
> www.geocities.com/sho_off_1993
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