[W126 Coupe] Running Hot update

[Mister McGoo]

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> > The MB Coupes Website!> W126 SEC Mailing List> Postings remain property of MB Coupes, L.L.C.
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