First, THANKS to everyone who answered today!
Short of some C4 or pushing it off a cliff Im not sure what to do with it! I replaced the radiator today witha new one. Flushed out the sytem etc etc. Its now running a little hotter than before!
Ive replaced:
Clutch
Sensor
Thermo
Radiator

I love this car though I know its the poor guys Mercedes and want to get it right. Im just so perplexed at this point!

Thanks for anything you can give!!!
**on a positive side the changing of the strut mount went very smooth today :-)

You probably still have air in the system. Try taking it out cold with the cap cracked open so it doesn't build pressure and run it on as steep an incline as you can find until it warms up...this helps to purge any air from the block.

__________________
Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

I have no idea if your car has air in the system, but I just wanted to share a little information about a tool I use frequently and love. I am in no way affiliated with this tool or company. The tool is made by airlift. After draining the coolant from the vehicle you hook this tool up to the radiotor coolant
reservoir. It suctions into the reservoir via the opening for the cap. You put
shop air to the tool which has a gauge on it and pull a vaccum on the system.
You will see all of the coolant hoses compress. After pulling a vaccum on the
system you install another adapter onto the fitting with the gauge. This adapter has a long clear hose that you put into a tub of coolant/water mix. You then turn the shutoff, and coolant is sucked into the car. You will have no air in the system after this is performed! The tool costs about 100 bucks and works awesome. It saves me so much time with bleeding the system and checking for leaks. As a Mercedes Benz technician it has got to be one of the
best tools I have bought. Has anyone else used a system like this? Sorry this process is probably hard to understand but trust me it's so easy.
Dustin

Michael,

If the car has not had Mercedes or Zerex G-05 (same stuff) antifreeze in it, you could well have corrosion on the water pump. I chased that on my SDL for a long time until I pulled the pump and found its aluminum housing badly eroded/corroded. Dunno why it would happen there, but it did. Replacing the pump got it cooling again.

Before you go there, you just might want to doublecheck the "new" thermostat by dunking it in a pan of heating water with a thermometer. There are reports of new ones sticking... Make sure it is installed right side up so the air can bleed through it.

When refilling the system, disconnect the upper radiator hose and pour as much coolant into the hose as you can. That helps it bleed out too.

Gerry Visel