[W126 Coupe] Running Hot update

[Doug Gavin]

Mister McGoo wrote:

> Pavel;
>  
> Not sure what the problem is.  You say your temp stays at 88 - 90 C 
> while driving around but drops to 85 when you "hammer" it.  What is 
> your thermostat temperature rating? 
>  
> I forget what engine you have but the standard thermostat on the 
> 380SEC (for instance) is rated at 84C. (116 200 02 15)  Bear in mind 
> that the temperature gauges in the MB are not exactly calibrated to 
> scientific medical standards, nor are thermostats manufactured within 
> fractional degree range accuracy. 
>  
> When accelerating uphill under load, you expect the temperature to 
> raise, maybe even to 100C.  When you subsequently coast downhill at 
> 130 KPH you expect the temperature to drop, maybe to 80C or lower.  
> But the temperature always recovers quickly as the thermostat 
> adjusts.  IF your gauge reads the other way around, or your 
> temperature readings jump quickly all over the place, your gauge is 
> likely toast.
>  
> Under normal use, at normal operating temperature, you should find 
> your top hose a bit too hot to keep your hand on it;  your lower hose 
> should be warm but not uncomfortable to grasp and hold.  It shouldn't 
> matter if you live in Texas or North Dakota.  
>  
> The only other unusual condition that I have seen is an old 
> spongy radiator hose collapsing and restricting the coolant flow. I'm 
> not saying that it can't happen, but I have never seen it with a 
> Mercedes Benz hose. 
>  
> But what you are now describing doesn't sound like anything 
> extraordinary. 
>  
> My 2¢
>  
> -Bellamy
>
>
>
>
>
> ------------------------------------------------------------------------
>
> > Date: Mon, 16 Oct 2006 15:51:41 -0500
> > From: zhur0002 at umn.edu
> > To: mbcoupes at mbcoupes.com
> > Subject: [W126 Coupe] Running Hot update
> >
> >  
> > Here is the update on the sec crew.  Put a brand new behr radiator in
> > 
> pulled drain plugs from block drained all the coolant filled it up with MB
> > 
> 50/50 antifreeze mix.  Started it up got all the air out of the system, the
> > 
> stupid thing still sits at 90 unless I rev it up to 2000 rmp then goes back
> > to 82 deg instantly, then creeps up to 90.  Stays between 88 90 while
> > driving around unless you hammer on it than goes down to 85.  It bugs me
> > 
> very much and it is not enjoyable for me to drive my sec anymore.  Is this
> > 
> getting caused by my new wahler thermostat?  Why did they do that?  Where
> > 
> do I get the original thermostat so my temp gauge does not drive me nuts.
> > thanks
> > Pavel
> >
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> > Postings remain property of MB Coupes, L.L.C.
>
>
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Just an additional 2 cents if I may. This will only confirm or deny some 
of your issues. Most good radiator shops have a hand held digital 
temperature sensor gun that they can point a various places on your 
engine and tell you exactly what the temp. is let's say at the intake 
manifold the thermostat housing etc. I found that my guage was 5 degrees 
hotter than the  actual temp.. at the thermostat. Most won't charge you 
and it takes about two minutes. Good luck