W203 High pressure in cooling system. Hi Scotty my 06 230 sports builds up high pressure in cooling system. After few days Upper or lower hose comes off fron sealing clips ( no screws in this…

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W203 High pressure in cooling system. Hi Scotty my 06 230 sports builds up high pressure in cooling system. After few days Upper or lower hose comes off fron sealing clips ( no screws in this model)and drains all coolant. Car does not over heat and does not seem to mix coolant or oil. Tried changing thermostat with no luck.

Any idea , appreciated.