even better, don't touch the existing clamps, just buy two more clamps. loosen them all the way (the come apart), and install them on the outer edges of the hose (towards the head and the thermostat housing)......if that does not fix it then you will need to replace it, but this will cost you $5 as apposed to a water pump job....

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1993 300E, 2.8 M104 .....