gassers control combustion by a flapper in the air intake,
controlling airflow into the cyl. Diesels run at full air flow all
the time, combustion is controlled with fuel. In effect coasting
downhill, the fuel is shut off, no heat occurrs and the cylinders are
washed with lotsa cool air. nothing to generate heat, cept friction.
Still not sure I understand why engine braking especially down hill
would lower temps dramatically.
Perhaps it causes an air bubble to dislodge?
Anyway, I just forced the tstat open with a piece of brass tubing.
Let's see what that does.
If I get no answers, I will take car to radiator shop. They said
they will pressure test cooling system and also look for head leaks.
About $100 for that service.
Sent from my iPhone
On Feb 26, 2015, at 2:33 AM, fmiser via Mercedes
<mercedes@okiebenz.com> wrote:
dseretakis--- wrote:
Interestingly, I noticed that heavy engine braking down hill
would bring the temps from almost in the red to normal, but once
I started accelerating the temp would rise again. Wonder why it
did that?
At idle, most diesel engines produce very little heat. With the
engine forced to turn and pump cold air through it, what little
heat the burning fuel made is carried out the tail pipe.
So - no heat being generated means no heat for the cooling system
to carry away - so no problem!
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