Re: [Chrysler300] 375 Troubled Horses

[Bill Huff <czbill@xxxxxxxxxx>]

The fan will never lock up if it is working 
properly.  However, if it is a thermal controlled 
fan , there should be a difference in resistance 
between hot and cold.  If it is a viscous fan 
that is not thermally controlled it will be 
pretty much the same all the time.  If it has a 
coiled flat spring like assembly on the front it 
is thermally controlled.  If not, probably just a viscous fan.

Bill Huff



At 8/17/201105:03 PM, Keith Boonstra wrote:
>
>
>And an update ----
>
>Just repeated the scenario that made it overflow yesterday - idled for
>about 10 minutes hot, then shut it down. I had no overflow this time,
>so I'm guessing it just needed to get rid of a little coolant to have an
>amount it considers an equilibrium.
>
>But I still wonder about the fan clutch. When I shut off the engine
>hot, I can very easily spin the fan. Shouldn't the thermal action of
>the clutch have it pretty much locked up in that situation? Or the
>clutch supposed to only lock up when it's VERY hot?
>
>Keith Boonstra
>
>-
>
>On 8/17/2011 12:42 PM, paul wrote:
> > On 8/17/2011 9:54 AM, Keith Boonstra wrote:
> >
> >> Well, here's the morning-after report. I had the cap tested this
> >> morning and it is dead on 14 #, so we're OK there. There is about
> >> 2-3/4" of tank between the core and the filler neck. The engine is cold
> >> now, of course, and I'm showing 3/4" of coolant and 2" of air in the top
> >> tank. This overflow situation has only occurred once so far, so if I'm
> >> lucky (a pretty rare thing for me these days) the system is now down to
> >> the amount of coolant it wants. I'll do a little watchful waiting.
> >>
> >> One thing I didn't think of doing at the time was to see if the fan
> >> clutch was stiff when the radiator was overflowing. I presume I should
> >> be able to feel that it is with the engine shut down while hot. I will
> >> make it a point to check that the next time I have it heated up.
> >>
> >> Thanks to all.
> >> Keith Boonstra
> >
> > Ok it sounds like your cooling system now might be at equilibrium,
> >
> > May I suggest that since you probably used a new anti-froze product to
> > about a 50-50 mix, that you think about NOT letting that sit in your
> > system the suggested 3-5 years.
> >
> > Once you have that air pocket established the modern formula not does
> > react to the presence of the air very well. It probably will develop
> > particulate fall out and can, given enough time, settle out and start
> > building up 'crude'. Been there Done That in the 'hot-rod' truck
> > parts chaser I have.
> >
> > Remedy, Annual flush and replace schedule.
> >
> > I adopted an abbreviated schedule for all our vehicles, even the
> > modern closed system car. We really noticed this when we bought the
> > used 98 Sebring convertible 8 or so years ago. And when we bought the
> > wifypoo's used 05 PT GT R/T that was something I checked out after we
> > got it home.
> > It too got a flush and clean then replaced the coolant and it was only
> > 3 years old then.
> >
>


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