HI EVERYONE, I AM NEW TO THIS FORUM AND WEBSIT BUT CAN SEE THAT FOLKS ARE HELPING WITH ISSUES TO OUR MERCEDES-THE BEST CARS!
ANYWAY I HAVE AN IMPORTANT ISSUE WITH MY COOLING SYSTEM SINCE I BOUGHT THE CAR AND OBVIOUSLY IS NOT NEW. WHEN I DRIVE TEMPERATURE IS REACHING ALMOST 120C, BUT WHEN I SWITCHING HEATING INSIDE THE CAR TEMPETURE OF COOLING SYSTEM DROP TO NORMAL, I AM AFRAID TO DRIVE, BUT SAW A LOT OF COMMENTS AND ITS SAYS THAT IT MAY HELP CHANGE THE COOLING FLUID AND ALSO IS BEST TO POOR TH WATER INSIDE THE WIDESCREEN CONSTAINER BACAUSE THE SYSTEM IS CAONNECTED. I DIDNT TRIED YET BUT I LOVE TO HEAR FROM YOU GUYS WHAT MIGHT BE THE REASON!
ON THE COMPUTER IT SAYS CHECK COOLING, AND TODAY FOR INSTANCE I DROVE TO THE SHOP AND FAN WAS SPINNING LIKE CRAZY! AND I WAS HOT INSIDE UNDER THE HOOD, PLEASE HELP ME!
ONE MORE THING WHEN THE CAR IS COLD IN THE MORNING WHEN STARTING IT MAKES STRANGE SOUND FOR A SECOND LIKE A GRINDING NOISE AND THEN ITS NORMAL, MIGHT BE THE WATER PUMP?
THANK YOU GUYS IN ADVANCE

First of all I would like to say, your post would be much better read if it were not in CAPS. Secondly, the washer fluid and coolant are not connected in the sense that they share fluid. They are only connected via parallel circuit for coolant level sending unit. If the car is actually overheating I would be looking for coolant leaks, checking water pump and thermostat for proper operation/noise. I would also conduct a coolant pressure test.