GREAT THREAD!

I have a new w126 500 SEC w a cooling problem
Mr MB found the thermo sticking so it was changed

It still runs hot & when I got home from the shop was over 110

I was checking radiator
the external llooks good

I did touch the rear fan while inspecting though I was careful as I thought it was not good to turn some things if they are on a clutch

I recall & didn't know if it was good or not
that the blades turned wo any noticeable resistance.

Could this also be affecting the engine temp?
I wonder why the mechanic didn't notice or check it
while trouble shooting the redline I had when I brought it into the shop.

It's been 105 here so I have delayed test driving that the mechanic suggested but I can't see how it would have cured itself since the drive hime from the shop the other day

I checked the coolant its brimming
He suggested perhaps air in the system as the thermo was sticking.

There are no leaks.

Great to find this thread

PS this is a gas engine

Does it sound like there is something wrong w the fan?
I do know it runs while the engine is idling.

I idled it the day after the repair in the garage.
The thermo opened when it got up to about 80 as the top hose got hot.
I didn;t check bottom hose
Will have to do that & top of radiator as least as I could feel was evenly hot.

Any sugggestions as to try to get it to run cooler

It is a 83 500 SEC Euro 5L engine so I am not sure what its normal operating temp is but at idle in the garage after about 15 min it crept up from 80 to over 100 so I shut it down.

Thanks!

Camelot Shadow- I do remeber on a 350SDL I had the temp gauge was showing pretty high but everything seemed to check out. It turned out that the coolant temperature sender was faulty. I put in a new one and it was reading the correct temp, if all else checks out give that a try.

Zack

Zack, another word of advice. Whenever you open the hood, turn the exposed end of the left-side fan blade to ensure that the belt is intact. A small stone can dislodge the belt. This leads to reduced cooling, and I've heard of one case of the belt damaging the condenser.

Thanks
But when I got home from the shop I could hardly open the hood
had to use a towel to wrap my hands as it was burning my hands.
So I don't feel its just a faulty temp gauge

Zack,

Just make sure your fans are spinning in the correct direction. There was a model midyear change and some fans come prewired to spin in wrong direction. They should push air through radiator and condensor. WHen I installed mine they were drawing air out through grille. Its any easy fix, just have to take plug apart and reverse the wires.

__________________
Dennis
2006 E320 CDI Black/Black Leather. Nav, HTD Seats HK stereo 32000 miles.
2000 VW Passat 1.8t 300,000 miles as of Dec 09, 2009 original owner
1997 E300d Silver 300,000 miles As of Jan 05, 2010
3rd owner SOLD