On 07/25/2015 10:19 AM, Leon wrote:

snip

1. The heat extracted by the radiator is blown straight back on to the
source. How does that work? LOL
And hence the extra electric fans that often continue to run after
engine is turned off. I can assure you that engines reach peek
operating temperatures more often when sitting in traffic in summer heat
than when putting out peek power. If it were not for those fans every
vehicle would be over heating when is stop and go traffic.


snip

Different set up altogether. The engine is more in the open and heat is
not captured by the engine compartment found on most 4 wheel vehicles.
And especially, the engine is not working nearly as hard as a similar HP
car engine lugging around 3000+ pounds and powering AC, which BTY also
contributes heat through the condenser, and vehicles that still have PS
pumps.

I had an overhearing problem with my 2004.5 Chev Duramax while towing a
10,000 lb trailer up a long grade in the AZ summer. The problem was
exactly what you mention - the heat from the radiator blown by the fan
when it engaged right into the the air intake - a wicked heat loop! The
solution was to upgrade the air intake to the cold air intake from the
2006 model as well as a much larger turbo intake to match the larger
size of the air intake plumbing. The next step would be a vented hood,
but the cold air intake solved the problem.

These trucks can generate some heat - the EGT can run about 1300F when
pulling a grade.



--
"Socialism is a philosophy of failure,the creed of ignorance, and the
gospel of envy, its inherent virtue is the equal sharing of misery"
-Winston Churchill