Re: [Chrysler300] more Xtreme overheating thoughts . . .

[lettercars@xxxxxxx]

Mike and All:
Sure seems like the fan (and clutch) is the "likely suspect" when the  car 
runs hot ONLY at idle.  My 1 1/2 cents worth, as my "F" is  not exactly a 
cool runner in hot weather and I haven't solved that  yet.   300ly, gil C.
 
 
In a message dated 6/28/2009 4:00:40 P.M. Eastern Daylight Time,  
mwl1967@xxxxxxx writes:

Hello  all,
I've   been watching the comments and experiences and wanted 
to share some of my  own  thoughts on how my MoPars have reacted to heat 
living in NY and  then moving out  here to AZ.  Summer arrived here 
yesterday 
with  the mercury reaching 110 so  I grabbed the oven mitts.. um I mean 
driving  
gloves and took the K coupe for a  ride for a few hours. This car's  temp 
gauge was calibrated by Jeff @ JC Auto so  lets assume its  registering 
correctly.  This car's engine has been bored  and  stroked to 494 ci's , is 
running 
a fresh 3 row radiator ( largest  would  fit in the original tanks ) fan 
shroud and clutch style fan.  Note that the  clutch is one picked from the 
Hayden 
catalog with  similar dimensions and  rotation to that of the current mopar 
 
repalcements which seem to be taller than  originals and no longer  clear 
the 
radiator.

As  long as I'm running 60mph or more the temp gauge never  
goes beyond straight up  (or midpoint).  Stop and go traffic  however will 
cause the temp to run 90%  across and just get up to the  "H" section of 
the 
gauge. Stop for more than a few  minutes with the  engine running and I'm 
clearly into the "H" range at the end of  the  gauge.  What's strange to me 
is 
that this result will occur   regardless of the outside ambient 
temperature.  
Example.. back in  March  during the cruise to Las Vegas for MoPars at the 
Strip I  recall it being maybe  70 degres in northern az.  Crusing was fine 
 at 
highway speed, temp gauge at  half but hit the traffic at the  Hoover Dam 
and I 
had to shut it down for fear of  cooking valve seals  or worse.

Am  I  expecting too much from a 22 inch radiator and a nealry 
500ci engine ?  ?   Perhaps. My stock K convertible with its 413 and 45 
year  
old  original-never-recored 3 row radiator has no shroud and a 4  blade  
solid 
fan with no clutch. Car never runs hot.. ever...   winter  time here runs 
the same. Summer time, same temps ( yeah gauge  does work; I've  seen it 
move) 
Highway, stop and go, car doesn't  care, cools fine and to be  honest and 
ashamed I don't think I've  even changed the coolant since moving  here 10 
years 
ago.   

As a comparison of big  blocks and 22  vs. 26 inch radiators I moved 
my '70 Charger 440 car out here and   had a little difference experience. 
That is a stock 440, with fan clutch,  26inch  3 row radiator with shroud, 
original and never recored. In NY  even sitting in  traffic going to and 
from 
Carlisle it ran the upper  edge of the gauge but never  hot. This in 95 
degree 
ambient temps.  Moved it out here to 110-115 and the  original 29 year old 
core  couldn't take it... it boiled regularly. 

A local  radiator shop told me the core was too old  and couldn't 
dissipate  the heat so they replaced the original 3 core with a 4  row 
"staggered"  
core. ( very interesting design ) Haven't had an issue since,  any  temp, 
stop or go car doesn't care.

Many local guys  run aluminum radiators out here  and/or electric 
cooling fans. I  wonder if that's more of a band-aid for another  
underlying  
condition. If my 440 runs cool with a good radiator why shouldn't   every 
other 
vehicle. The 440 Charger and my 500ci K are both manual trans  so  that 
removes 
the automatic trans heating the radiator out of the  equation. I've  given 
some thought to yanking the clutch fan on my K  and putting a solid mounted 
 7 
blade in it's place to see what  happens. I think I may just be expecting 
too 
much from a little 22 inch  radiator and might have to go aluminum. 

Absent an  entirely separate discusion of fan clutch  operation and or 
ignition  and cam timings affect on engine cooling what are all  your  
thoughts?

Thanks,
Mike Laiserin
Phoenix, AZ     
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