I believe a 50 / 50 mixture of antifreeze and water freezes at - 34 degrees Fahrenheit
Antifreeze
212 f at sea level in the radiator it is pressurised and is higher than that
Antifreeze keeps your coolant from freezing. It keeps your coolant more "fluid".
radiator antifreeze coolant.
the cooling tank in the radiator for the transmission is bad
You have a failed radiator. Most vehicles have a trans cooler on the side of the radiator.
The transmission cooler (possibly part of the radiator) has failed
You have a leaking transmission cooler, usually part of the radiator. The transmission fluid is mixing with the antifreeze turning it pink.
Most transmissions are cooled using separate tubs in your radiator, if this tube develops a leak it could mix with your antifreeze, you need a new radiator...
antifreeze is usually mixed 50 / 50 with preferably distilled water for your cooling system ( up to 60 % antifreeze if colder climate ) which includes the radiator , heater core , radiator hoses , heater hoses etc.
Antifreeze is green in color and is leaking from your radiator .
To change the antifreeze on a Mercedes, locate the drain plug on the bottom of the radiator. Drain the fluid into a pan and refill it.