Unfortunately, on anything newer than yours, it means a new
radiator. It is not possible to uncrimp the aluminum core from the
plastic tanks and crimp them back on without leaks -- the aluminum
fatigues and will fail to seal every time.
Not a bad plan, though -- and something I need to do with my "new" 87
since it gets hot in traffic (100C).
Peter
On Apr 25, 2009, at 3:48 PM, LWB250 wrote:
My former 82 300SD ran hot when I first got it, but only at speeds
above about 30-40 mph. If you got out on the highway it would run
up in the 90s (C) and just sit there. Drop down to a lower speed
and the temp dropped down to the expected 87C.
1.) Cleaned the radiator. That is, removed it and pressure washed
the core. It was nasty. No joy.
2.) Replaced the thermostat. Rumors abound of Behr thermostats
being grossly inconsistent. Not this time.
3.) Made sure the little bypass line was working. Yup, clean as a
whistle.
4.) Replace water pump - the pump that came off was a NAPA pump.
Oh, boy, this has GOT to be it. Nope.
5.) Take radiator out and have the guy that did all of our
industrial engine radiators take a look at it. Bingo.
At some point in time, the PO ran the evil green stuff in it, and
long enough that it got exhausted and a great deal of the chemicals
dropped out of solution. So much so to the point that it clogged
the center tubes of the core. Interestingly enough, when he rodded
the core out, only a circular portion of the radiator tubes were
clogged, that is, the very center of the core where air flow (fan
hub) was at the lowest.
So, the reason it would work fine at lower speeds was because I had
plenty of surface area to dump the heat. At high speeds when I
needed all of the radiator surface to dump engine heat to ambient
air, I didn't have it. Therefore, the excess heat remained in the
cooling system and the temperature of the system increased.
I got into the habit of taking every radiator out of my MBs after
that point and having them professionally cleaned. It's an easy
job and relatively cheap (used to be well under $100.)
Dan
--- On Sat, 4/25/09, Luther <benz-n-h...@gulseth.net> wrote:
From: Luther <benz-n-h...@gulseth.net>
Subject: Re: [MBZ] 87 MBZ 420 SEL High temp
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Date: Saturday, April 25, 2009, 2:25 PM
My SDL is in that same shape....
Luther
OK Don wrote:
Every time I've had an engine runnig hot, a new
radiator cured it. Cleaning
the old one has only made minor differences. Seems
that every car I've
gotten that has had green coolant has needed a new
radiator.
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