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

["Mike Bosworth" <mike.bosworth@xxxxxxxxxxxxxx>]

Hi Derek

Nice to see a post from you :)

My thoughts are if the blower motor works on all speeds from a 
direct 12v supply then it must be another electrical problem, after 
checking both fuses,  if you are running an origional  25amp circuit 
breaker then i would replace that and upgrade to the recomended 30 
amp one, i think your origional one is probably getting 'tired', it 
could be your  4th + 3rd fan speed relays need replacing ( both are 
interchangable ) but i still feel its the breaker thats at fault.

Maybe swap out another compatable relay say the high beam one , next 
relay to the right, with the fan relay and see if that helps?

Suggestion for place to purchase breakers from with the origional 
tabs, maybe our UK suppliers can source these and stick them on 
their web sites?

http://specialtauto.com/delorean-parts/electrical-2.html

Kind Regards

Mike
#2001 / 403

 
--- 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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