OK so this repair thing just turned HILARIOUS!
Lets laugh at little why dont we? Here is an explanation on why some people should never be allowed to touch a car.
So lets get this T-Stat housing out.
BOOOOOOMMMMM...NO GASKET....NICE!

Lets check even further into what happens when u try to 1 up the invention of a GASKET?
BOOOOOOOOMMMM IT DISTORTS THINGS! NICE...x2

Lets take this LAUGHTER even a step further...GET READY...WAIT FOR IT, It will be worth it.
So I ask myself in my misery, maybe I could at least test the old Thermostat to see if it was even opening at right temperature, u know, the drop in 200F degree water test.
BOOOOOMMM to the 10th POWER..THERE IS NO THERMOSTAT.FAIL BIG TIME!!! THis should be placed in the FAIL THREAD instead.


Now 2 things. Im happy that I actually know more about mechanics than who ever touched this car prior to me. And im also amazed at the fact that Mercedes built a motor that was RETARD PROOF.

 

Regarding flow in the Coolant Tank,
The repair manual I have states :

As the engine heats up during operation, coolant is forced from the radiator, through the connecting tube and into the reservoir. (pressurized coolant recovery tank). As the engine cools, the coolant is automatically drawn back into the radiator to keep the level correct.

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In any case my issue was that of compounding errors!!
Faulty Coolant Cap,
Incorrect T-stat housing to block & T-stat housing gaskets,(actually had none)
Distorted Thermostat Housing, (due to conductive heat)
And the "Dim Mak" or "touch of death" of no thermostat at ALL.

She still ran though..I think im gonna start calling her "sour cabbage" instead of the ***** Wagon.

 

Ok picked up a 79-80 300sd nice T-stat housing for $10. Part is stamped with identical (617 203 19 73) however, the 2 sensors are located in a different sequential order. Both are post t-stat. The one on my 85 wagon has one pre and one post t-stat. Will it be an issue to fit the freshly picked housing on my 85 wagon? This part NEW is like 120 bucks so Im praying that it will be mountable.

Any one know what both sensors "read/measure" on the 300SD vs the 85' 300TD? In other words, why do they differ in location.
Im under the assumption that they are simply coolant temp sensors, maybe they trigger the function of the t-stat?
I have looked at many w123 diagrams but NONE show sensors.


I would hate to have to tap the housing to match the original 85 set up but will if it should be done.

Pls help, thanks
cheers

 

I think that I need an 85 year only t-stat housing. DAMN!!
To tap or not to tap..ANY ONE HAVE AN 85' T-STAT HOUSING WITH THE SAME COMBO SENSORS AS THE ONE ON THE "RIGHT"?

HIT ME UP!

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Bump, According to DeliveryValve over at old P.P thread regarding similar issue,

QUOTE: "That temperature sensor is for the 1985 only vacuum modulation system for the transmission. It's a 50º C sensor. "