PeachParts Mercedes-Benz Forum - View Single Post - Do I have trapped air in my cooling System?

bwheitman · #4 03-27-2005, 10:27 AM

When you replaced your thermostat did it have a little hole with a bearing in it? that is the bleeder ball valve that MB started putting in the thermos because air would get caught up next to the thermo and not allow it to open and overheat the system, you had to pull the radiator hose off and use a plastic wedge to open the thermo and allow the air to escape. Since MB started using this ball valve in the thermo I have not seen an issue with air causing the system to overheat. When you squeeze the top hose you will hear gurgling and air. But like beforementioned you should start when cold and run for about 10 with the cap off the resevoir to ensure all air is out. While it is running squeeze the top radiator hose a few to make sure all the air is out. Good Luck!