Re: [Chrysler300] 375 Troubled Horses

[Keith Boonstra <kboonstra@xxxxxxxxxxxx>]

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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