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2007 Mercedes-Benz SLK 280 Questions & Answers
MERCEDES SLK 200 MANUAL 17,000
the problem could be as simple as a faulty radiator cap from your description the water that is expelled when it gets hot is not being drawn back as the radiator cools down
could be a leak in the reservoir hose
I am thinking that the low coolant sensor in the top of the radiator tank is getting an air space and that is what is activating the light
I don't think it was head gasket problem as you would be overheating or loosing coolant within days not weeks I would go to an accredited radiator specialist shop and have a pressure test done for leaks in the system including the water pump leaking when running
I am saying that the vacuum created as the coolant cools down is not as good as it should be to draw water back from the reservoir to keep the radiator full to the cap
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