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

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

Im would carefully inspect your wiring around the blower motor 
electrical points in the relay compartment... there is a reason for 
the sizzling noise, check that all of your insulation on the wires 
is still there and not gone brown and brittle, clean up the contacts 
on the relays / fuses in there with contact cleaner. Bad contacts 
from years of tarnishing and expansion of the connectors cause heat 
build up and nasty relay compartment meltdowns ... In fact damm the 
expense replace all of the fuses :) 

Regards

Mike
#2001

--- In doc-uk@xxxxxxxxxxxxxxx, "Mike Bosworth" <mike.bosworth@...> 
wrote:
>
> 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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