[W126 Coupe] (no subject)
Dick Spellman
spell.yy at verizon.net
Fri Jun 2 15:46:46 EDT 2006
Hi Gary;
The only two anti-freeze brands recommended for the Mercedes are Zerex
G05 (hard to find and $12/gallon) and the MB antifreeze at the
stealership (very pricey like$23/gallon).
Stu Ritter at mercedeslist.com did a write-up on Mercedes that operate
at high altitude or in year round warm climates like San Diego. You
simply remove the two leads from the fan switch on the receiver dryer
and wire them into a single pole form c relay (one to Common the other
to N.O.)that accepts a 12 volt trigger. The 12 volt trigger is acquired
from one of the 3 pins on the ac compressor clutch housing. You'll need
a volt meter to confirm which one goes 12VDC positive when AC is
selected on the climate control. I did this on one of my 300SE's
operating a Nippondenso compressor so I can take a photo or two if that
helps. I also used an ELK relay part # ELK-912 or if you prefer larger
screw terminals ELK-912B found at www.elkproducts.com This relay coil
is rated at 7amps 30VDC so it's more than adequate. I then wrapped it
in self-seal foil to keep the moisture out. Ground for the relay coil
is found at the radiator vertical support right next to the receiver
dryer where you should see a MB ground point with many brown wires attached.
By the way since I did the relay wiring because I had a steady high temp
while the AC was on (just shy of 120 C) with new tstat and visco
clutch. Since I replaced the radiator there is no need for the relay
wiring where I live near Boston, MA and on hot days the coolant temp now
sits about 90 C. So, in my case it was the radiator failing after 110k
miles or so. You should try and test the condition of your radiator
with one of the IR temperature probes if you manage to get your hands on
one. Then you can see if the radiator has any patches where it's
blocked and therefore not providing the surface area that you need for
complete cooling capacity.
Regards,
Dick
Gary wrote:
> hey dick i use off-the-shelf preston anti freeze is this bad?
> also the part about the aux fans...i have an 88 sec...do the fans come
> on when i turn on the a/c? and if not how do make that happen. i
> live in san diego, california.
>
> */Dick Spellman <spell.yy at verizon.net>/* wrote:
>
> Hi Philip:
>
> Thermostat 83 C and replenish the anti-freeze with Zerex G05 or MB
> antifreeze only.
> Visco Fan Clutch
> Check your various belts and hoses at the same time
> Where you are in Boulder you could wire-up a relay for the aux
> fans to
> always be on when the AC is selected on the climate control.
>
> In any event, you likely need the tstat and visco fan clutch to
> resolve
> the overheating before you end up with bigger problems like head
> gasket
> etc. The above presumes you do not see coolant loss and/or you do not
> see bubbles in the coolant expansion tank with engine running, in
> other
> words the head gasket remains intact at this time. You can get a deal
> on parts from Jonathan or Rusty for the SEC.
>
> Regards,
>
> Dick
>
> PHILIP GERONIMO wrote:
>
> >
> >
> > Hello, I just bought a 1987 560 SEC. It flirts with overheating,
> i.e.
> > during normal driving, no matter what conditions the temp gage
> climbs
> > to 120C and the red zone, and then the aux fan kicks in, in
> order of
> > frequency, what is the most likely cause? I need to prioritize my
> > spending. Thanks in advance for the help.
> >
> > Philip, Boulder CO
> >
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> Postings remain property of MB Coupes, L.L.C.
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>Postings remain property of MB Coupes, L.L.C.
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