Blimey - surely it can't heat that quick, 2 minutes seems remarkably fast, although I appreciate that there's a significant heat source
Most cars I've ever owned take 10 minutes to reach operating temperature, none heat in 2 minutes. In cold weather the driver has also got the heating system running so it's not a closed system then.
There were no tabs to start with
I will try again and make the text easier to read latter tonight.
I agree that slow heating is often due to the tstat but in my opinion the tstat is completely unrelated to normal operating temperature once the engine has reached thermal equilibrium, unless it's stuck closed/partially which will increase coolant temp above normal - are you sure your W140 is opening fully?
Can anyone else comment? I'd hate to go off topic, but (for me at least) I want to ensure my understanding is correct.
I'm soon to purchase a brand new shiny Sachs vfc, so I'll take some measurements before and after fitting and let you know what I find.
Lea