RE: [DML] blower fan quits.

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

The older the blower motor the more current it draws. It's an inductive load
motor and that is what they do.
Even though installing a new blower won't stop the CB from tripping on 3 and
4 but it will reduce how often it trips the breaker and will slow down the
trip time. Adding a 30 amp breaker will allow just a tad more current and
with a new motor will slow down the trip time even more.
I would not go any higher than 30 amps on the CB because the higher the
current capacity that it will handle there becomes a point where the wires
will cook to a crisp and become dangerous.
Inductive load motors like the blower, fuel pump and fans do this even on
newer cars and Bussman Fuse Company calls it a nuisance blow. 
After the CB cools a little then it will heal it's self, the blower will
come back on and eventually do it again. Fan speed 3 will slow down the
process and 4 will speed up the process. New relays won't fix it either.
Fuel pumps will melt the fuse with out blowing it, look at your #7 and old
radiator will melt fuses also. Length of time they are on ( long trips ) and
temperature outside all play a role in what happens.
This is why so many cars fail on long trips when parts are staying on for
hours.
 
John Hervey
www.deloreanautoparts.com

 





-----Original Message-----
From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
jtrealtywebspannet
Sent: Wednesday, July 04, 2012 10:47 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] What would cause my blower fan (A/C) to quit after 1
minute?

I would not bother changing the lock module circuit breaker. Just stick an
in-line fuse for the lock module in the big red wire. that way it can't keep
resetting and burning up your solenoids.
David Teitelbaum

--- In dmcnews@xxxxxxxxxxxxxxx, "daveswingle2" <swingle_dmc@...> wrote:
>
> 40 is for the fans up front. 25 is plenty for the blower. If a good,
relatively new 25 amp breaker is tripping on the blower, the blower is bad.
When blower motors fail they pull too much current. But even at this they
would only trip the breaker on speed 4 as speed 3 has a resistor in the path
that reduces the current. 
> 
> The reason it works on speed 1 and 2 with a bad breaker is that the
breaker is not in the circuit at all at those speed settings. 
> 
> The other 25 in the kit is for the lock module. 
> 
> As breakers age and corrode, they tend to trip out at lower currents since
the contacts inside get hot. A properly functioning breaker in the fan
circuits should not be hot to the touch. 
> 
> Dave S
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "Doug Menkhaus" <dmenkhaus@> wrote:
> >
> > Dude, this was EXACTLY what I was looking for, THANK YOU!!
> > 
> >  
> > 
> > I have the Relay Kit from DMCMW, which had the required Circuit
Breakers.  I
> > hear you on the 30 Amp, but I have the new 25 amp, and I'm, not in the
> > position tonight to run to the parts store, so I went with that, and the
> > fans stay ON after 5 minutes, so I'll run with that tomorrow, and swing
by
> > and get the bigger one after the parade.  Here's something you never
hear
> > about Previous Owners, I want to thank him/her for doing what they did.
> > They left the OEM harness alone when they replaced the Circuit Breaker
last
> > time (see pic).  Get this:  It was a 40 AMP!  Guess it was just old!
> >
>




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