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I just fixed my overheating problem with my 300SDL but it may or may be applicable to your car.
1) Change out the overflow tank cap with a new one. I bought a 20lbs one from Autozone for $5, so it is not that expensive to try. Try to sqeeze the radiator hose after the car is at temp for a while. The hose should be pressurized and should stay pressurized for a day, may be longer. This is normal. If the hose is not pressurized then the cooling system is not air tight, most likely a leaky cap.
2) Check the aux fan can go on high speed. I do not know your car but there should be a thermostat-switch near the top of the radiator hose. It may be 2 prongs or may be 3 prongs. That is the trigger switch for the fan to come on. On my 300SDL, it is 3 prongs and if I shorted the 2 prongs connector and the fan will come on. The third prong goes to a single connector is cut in at 125/8C to turn off the A/C I think. Your car may DIFFER.
3) You can get a lower cut-in temperature thermostat switch. My 300SDL is 105C rated ( grey color ) for the fan to cut in. I bought a 100C rated ( red color ) to give it a better safety margin as it has the #14 head.
Hope this help. Good luck.
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